LegalizeThe Water Framework Directive (Priority Substances and Classification) Regulations (Northern Ireland) 2011
Made: 21st January 2011
Coming into operation: 14th February 2011
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Citation and commencement
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interpretation
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typology and Environmental Standards
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental standards for priority substances, Intermittent Discharge Standards and standards for Shellfish Waters
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Classification of surface waters
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Classification of Groundwater
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Designation of Mixing Zones
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inventory of emissions, discharges and losses
8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revocations
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCHEDULE1
PART 1 — Criteria for identifying the types of river, lake or transitional water to which the environmental standards specified in Part 2 of this Schedule apply
1
Subject to paragraph 2, to determine the dissolved oxygen, ammonia and biochemical oxygen demand standards applicable to a river or any part thereof, the Department shall assign to that river or part thereof the Type specified in Table 1 below which corresponds with the applicable site altitude and applicable alkalinity range specified in that Table.
2
Having assigned a Type in accordance with Table 1, the Department shall assign the subsequent Type in accordance with column 1 of Table 2.
3
To determine the reactive phosphorus standards applicable to a river or any part thereof, the Department shall assign to that river or part thereof the Type specified in Table 3 below which corresponds with the applicable site altitude and applicable alkalinity range specified in that Table.
4
To determine the morphological conditions applicable to a river or part thereof, the Department shall assign to that river or part thereof the Type specified in Table 4 below which corresponds with the applicable descriptions in that Table.
5
To determine the river flow standards applicable to a river or any part thereof, the Department shall assign the Type specified in column 1 of Table 5 below which corresponds to the applicable descriptions in specified in columns 2, 3 and 4 of that Table.
6
To determine the dissolved oxygen standards applicable to a lake or any part thereof, the Department shall assign to that lake or part thereof the Type specified in Table 6 below which corresponds with the applicable description specified in that Table.
7
To determine the total phosphorus standards to apply to a lake or any part thereof, the Department shall assign to that lake or part thereof the appropriate geological category, depth category and colour category specified in Tables 7, 8 and 9 respectively.
8
To determine the lake water level standards and morphological conditions applicable to a lake or any part thereof, the Department shall assign—
- (a) the physical characteristics of the lake or part thereof specified in column 1 of Table 10 below into the categories specified in column 3 of that Table which correspond to the applicable measurements specified in column 3;
- (b) the geological characteristics of the lake or part thereof as being of the category specified in column 1 of Table 11 below which corresponds to the applicable descriptions or measurements specified in columns 2, 3, 4 and 5 of that Table, and
- (c) the hydromorphological characteristics of the lake or part thereof as being of the type specified in column 1 of Table 12 below which corresponds to the applicable measurements specified in columns 3 and 4 of that Table.
| Site Altitude | Alkalinity (as mg/l CaCO₃) | Alkalinity (as mg/l CaCO₃) | Alkalinity (as mg/l CaCO₃) | Alkalinity (as mg/l CaCO₃) | Alkalinity (as mg/l CaCO₃) |
|---|---|---|---|---|---|
| Site Altitude | Less than 10 | 10 to 50 | 50 to 100 | 100 to 200 | Over 200 |
| Under 80 metres | Type 1 | Type 2 | Type 3 | Type 5 | Type 7 |
| Over 80 metres | Type 1 | Type 2 | Type 4 | Type 6 | Type 7 |
| Final typology for dissolved oxygen, ammonia and biochemical oxygen demand in rivers | Final typology for dissolved oxygen, ammonia and biochemical oxygen demand in rivers | ||||
| --- | --- | ||||
| Column 1 | Column 2 | ||||
| Upland and low alkalinity | Types (1+2), 4 and 6 | ||||
| Lowland and high alkalinity | Types 3, 5 and 7 | ||||
| Altitude | Annual mean alkalinity (as mg/l CaCO₃) | Annual mean alkalinity (as mg/l CaCO₃) | |||
| --- | --- | --- | |||
| Altitude | < 50 | ≥ 50 | |||
| Under 80 metres | Type 1n | Type 3n | |||
| Over 80 metres | Type 2n | Type 4n | |||
| Type | Characteristics | Characteristics | Characteristics | Characteristics | |
| --- | --- | --- | --- | --- | |
| Bedrock channel | Normally high altitude | Channel cuts down laterally | May have waterfalls and/or cascades | Bedrock substrate | |
| Cascade Step Pool | Normally high altitude | Channel cuts down | Both turbulent and tranquil flows | Cobble and boulder substrate | |
| Pool-riffle-glide | Normally medium altitude | Often not confined within a valley | Slightly meandering | Pebble and cobble substrate | |
| Meandering | Normally low altitude | Flow laminar and would naturally interact with floodplain | Meandering | More fines than other substrates | |
| Col 1 | Col 2 | Col 3 | Col 4 | Col 4 | |
| --- | --- | --- | --- | --- | |
| Type | Standard Average Annual Rainfall mm (period 1961-1990) | Base Flow Index (BFI) | Catchment area (km²) | Catchment area (km²) | |
| A1 | < 810.5 | < 0.715 | Any | Any | |
| A1 | < 810.5 | ≥ 0.715 | ≥ 251.8 | ≥ 251.8 | |
| A2 | < 810.5 | ≥ 0.715 | < 251.8 | ≤ 100 (A2 headwaters)> 100 (A2 downstream) | |
| A2 | ≥ 810.5 and < 1413 | ≥ 0.7495 | Any | ≤ 100 (A2 headwaters)> 100 (A2 downstream) | |
| B1 | ≥ 810.5 and < 1155 | ≥ 0.3615 and < 0.7495 | < 267.4 | < 267.4 | |
| B2 | ≥ 810.5 and < 1413 | ≥ 0.3615 and < 0.7495 | < 267.4 | < 267.4 | |
| C2 | ≥ 1155 and < 1413 | ≥ 0.3615 and < 0.7495 | < 267.4 | < 267.4 | |
| C2 | ≥ 1413 | ≥ 0.3615 | ≥ 32.33 | ≥ 32.33 | |
| D2 | ≥ 1413 | ≥ 0.3615 | < 32.33 | < 32.33 | |
| D2 | ≥ 810.5 | < 0.3615 | Any | Any | |
| Type | Description | ||||
| --- | --- | ||||
| Salmonid | Freshwater lakes which would naturally support populations of salmonid fish | ||||
| Cyprinid | Freshwater lakes in which populations of salmonid fish do not occur naturally | ||||
| Geological category | Annual mean alkalinity (micro-equivalents per litre) | ||||
| --- | --- | ||||
| Low alkalinity | < 200 | ||||
| Moderate alkalinity | 200 – 1000 | ||||
| High alkalinity | > 1000 | ||||
| Marl | > 1000 | ||||
| Depth category | Mean depth (metres) | ||||
| --- | --- | ||||
| Very shallow | < 3 | ||||
| Shallow | 3 – 15 | ||||
| Deep | > 15 | ||||
| Colour category | Platinum (mg/l) | ||||
| --- | --- | ||||
| Humic | > 30 | ||||
| Non humic | ≤ 30 | ||||
| Column 1 | Column 2 | Column 3 | Column 3 | Column 3 | Column 3 |
| --- | --- | --- | --- | --- | --- |
| Characteristics | Unit | Categories | Categories | Categories | Categories |
| Mean depth | Metres | Shallow < 3 | Shallow < 3 | Deep ≥ 3 | Deep ≥ 3 |
| Altitude | Metres | Low < 200 | Mid ≥ 200 < 800 | Mid ≥ 200 < 800 | High ≥ 800 |
| Size (lake area) | Hectares | Small < 50 | Small < 50 | Large ≥ 50 | Large ≥ 50 |
| Basin form | Vd = 3Dmean / Dmaxwhere D = depth of lake in metres, Dmean = mean depth and Dmax = maximum depth | VVd < 0.67 | VVd < 0.67 | LVd ≥ 0.67 | LVd ≥ 0.67 |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| --- | --- | --- | --- | --- | |
| Categories | Solid geology of catchment | Alkalinity | Conductivity | Colour | |
| % of catchment | Micro-equivalents per litre | Micro Siemens per centimetre | Platinum (mg/l) | ||
| Peat | > 75% peat | n/a | n/a | > 30 | |
| Low Alkalinity | > 90% siliceous | < 200 | ≤ 70 | ≤ 30 | |
| Moderate Alkalinity | > 50% siliceous and ≤ 90% siliceous | 200 – 1000 | > 70 and ≤ | ≤ 30 | |
| High Alkalinity | > 50% calcareous | > 1000 | > 250 and ≤ 1000 | ≤ 30 | |
| Marl | > 65% limestone | > 1000 | > 250 and ≤ 1000 | ≤ 30 | |
| Brackish | Any | n/a | > 1000 | ≤ 30 | |
| Column 1 | Column 2 | Column 3 | Column 4 | ||
| --- | --- | --- | --- | ||
| Type | Lake-MImAS[^f00011] code | Mean Depth | Alkalinity | ||
| Low AlkalinityVery Shallow | P/L-vS | <4m | < 20 mgl⁻¹ CaCO₃ | ||
| Low Alkalinity Shallow/Deep | P/L-ShD | >4m | < 20 mgl⁻¹ CaCO₃ | ||
| Moderate Alkalinity Very Shallow | MA-vS | <4m | 20 – 100 mgl⁻¹ CaCO₃ | ||
| Moderate Alkalinity Shallow/Deep | MA-ShD | >4m | 20 – 100 mgl⁻¹ CaCO₃ | ||
| High Alkalinity Very Shallow | HA/M-vS | <4m | > 100 mgl⁻¹ CaCO₃ | ||
| High Alkalinity Shallow/Deep | HA/M-ShD | >4m | > 100 mgl⁻¹ CaCO₃ |
PART 2 — Environmental Standards
Environmental standards for river water quality
1
Once the Department has, in accordance with paragraphs 1 and 2 of Part I of this Schedule, assigned to a river or any part thereof a Type—
- (a) specified in column 1 of Table 1 below, it shall apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” dissolved oxygen standard specified in columns 2, 3, 4, 5 and 6 respectively of that Table to that river or part thereof;
- (b) specified in column 1 of Table 2 below, it shall apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” ammonia standard specified in columns 2, 3, 4, 5 and 6 respectively of that Table to that river or part thereof;
- (c) specified in column 1 of Table 3 below, it shall apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” biochemical oxygen demand standard specified in columns 2, 3, 4, 5 and 6 respectively of that Table to that river or part thereof.
2
The Department shall apply the “high”, “good”, “moderate”, “poor” or “bad” biochemical oxygen demand standard specified in Table 3 below only for the purpose of deciding action to meet the standard for dissolved oxygen.
3
Once the Department has, in accordance with paragraph 3 of Part I of this Schedule, assigned to a river or part thereof a Type specified in column 1 of Table 4 below, it shall apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” reactive phosphorus standard specified in columns 2, 3, 4, 5 and 6 respectively of that Table to that river or part thereof.
4
The Department shall, as applicable, apply the “high”, “good”, “moderate”, “poor” or “bad” acid condition standards specified in columns 1, 2, 3, 4 and 5 respectively of Table 5 below to any river or part thereof.
Environmental standards for river flows
5
- (1) Once the Department has, in accordance with paragraph 6 of Part I of this Schedule, assigned to a river or part thereof a Type specified in column 1 of Tables 6, 7, 8, 9 or 10 below, it shall apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” river flow standards as specified by the boundary values in those Tables to that river or part thereof.
- (2) The result of this classification shall be used only to determine “high” status in accordance with Part 1 of Schedule 2.
Environmental standards for lake water quality
6
Once the Department has, in accordance with paragraph 7 of Part I of this Schedule, assigned to a lake or part thereof the Type “salmonid” or “cyprinid”, it shall apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” dissolved oxygen standard specified in Table 11 below to that lake or part thereof.
7
The Department shall apply the “good” salinity standard specified in Table 12 below to all lakes or parts of such lakes.
8
Once the Department has, in accordance with paragraph 8 of Part I of this Schedule, assigned to a lake or part thereof a geological category, depth category and colour category specified in Tables 7, 8 and 9 in that Part, it shall apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” total phosphorus standard to that lake or part thereof, calculated in accordance with the formulae specified in columns 1, 2, 3, 4 and 5 respectively of Table 13 below, where in relation to those formulae—
- “R” represents the annual mean total phosphorus concentration expected for the lake in the absence of more than very minor phosphorus inputs to the lake resulting from human activities and, where a reliable estimate of ‘C’ is available, shall have the value given by the formula: Antilog₁₀ [1.36 – (0.09 x A) + (0.24 x B)] for non-humic lakes; and Antilog₁₀ [1.62 – (0.09) x A + (0.24 x B)] for humic lakes;
- “A” = Log₁₀ of the altitude in metres above mean sea level of the lake;
- “B” = Log₁₀ (C÷D);
- “C” = the mean alkalinity of the lake in milli-equivalents per litre estimated for the lake;
- “D” = the mean depth of the lake in metres;
- “H” = 0.755 + (0.012 x C) – (0.001 x D); or 0.7, whichever is larger value; and
- “G” = 0.506 + (0.023 x C) – (0.002 x D); or 0.46, whichever is the larger value.
9
If the Department does not have the necessary data to calculate the total phosphorus standard applicable to a lake or part thereof in accordance with paragraph 8, it shall apply, as applicable to the lake or part thereof, the “high”, “good”, “moderate”, “poor” or “bad” total phosphorus standard specified in column 2, 3, 4, 5 and 6 respectively, of Table 14 below which corresponds with the combination of geological category and depth categories specified in column 1 of that Table that is applicable to the lake or part thereof.
Environmental standards for protection of inland lake water levels
10
Once the Department has assigned the characteristics of a lake or part thereof, in accordance with paragraph 9 of Part I of this Schedule, it shall apply, as applicable, to the lake or part thereof the “good” lake standard specified in columns 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14 of Table 15 below which, in accordance with Table 15, applies to that lake or part thereof with the combination of characteristics applicable to the lake or part thereof.
Environmental standards for transitional and coastal water quality
11
The Department shall apply, as applicable, the dissolved oxygen standards for “high”, “good”, “moderate”, “poor” or “bad” specified in Table 16 and Table 17 below to transitional or coastal waters or parts thereof.
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental standards for specific pollutants
13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Standards for River Water Quality
| Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) | Dissolved oxygen (percent saturation) |
|---|---|---|---|---|---|
| (1)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (1)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. |
| (10-percentile) | (10-percentile) | (10-percentile) | (10-percentile) | (10-percentile) | (10-percentile) |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type[^f01000] | High | Good | Moderate | Poor | Bad |
| Upland and low alkalinity | 80 | 75 | 64 | 50 | < 50 |
| Lowland and high alkalinity | 70 | 60 | 54 | 45 | < 45 |
| Total ammonia (mg/l) | Total ammonia (mg/l) | Total ammonia (mg/l) | Total ammonia (mg/l) | Total ammonia (mg/l) | Total ammonia (mg/l) |
| --- | --- | --- | --- | --- | --- |
| (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type | High | Good | Moderate | Poor | Bad |
| Upland and low alkalinity | 0.2 | 0.3 | 0.75 | 1.1 | > 1.1 |
| Lowland and high alkalinity | 0.3 | 0.6 | 1.1 | 2.5 | > 2.5 |
| Biochemical oxygen demand (mg/l)[^f01001] | Biochemical oxygen demand (mg/l)[^f01001] | Biochemical oxygen demand (mg/l)[^f01001] | Biochemical oxygen demand (mg/l)[^f01001] | Biochemical oxygen demand (mg/l)[^f01001] | Biochemical oxygen demand (mg/l)[^f01001] |
| --- | --- | --- | --- | --- | --- |
| (i)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (i)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (i)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (i)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (i)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. | (i)The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen. |
| (ii)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (ii)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (ii)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (ii)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (ii)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. | (ii)Where a lowland, high alkalinity river is a salmonid river (as designated by Directive 2006/44/EC ‘on the quality of freshwaters needing protection or improvement in order to support fish life’) the standards for the upland, low alkalinity type will apply. |
| (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) | (90-percentile) |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type[^f01002] | High | Good | Moderate | Poor | Bad |
| Upland and low alkalinity | 3 | 4 | 6 | 7.5 | > 7.5 |
| Lowland and high alkalinity | 4 | 5 | 6.5 | 9 | > 9 |
| Reactive phosphorus (ug/l) | Reactive phosphorus (ug/l) | Reactive phosphorus (ug/l) | Reactive phosphorus (ug/l) | Reactive phosphorus (ug/l) | Reactive phosphorus (ug/l) |
| --- | --- | --- | --- | --- | --- |
| (annual mean) | (annual mean) | (annual mean) | (annual mean) | (annual mean) | (annual mean) |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type | High | Good | Moderate | Poor | Bad |
| 1n | 30 | 50 | 150 | 500 | > 500 |
| 2n | 20 | 40 | 150 | 500 | > 500 |
| 3n+4n | 50 | 120 | 250 | 1000 | > 1000 |
| pH | pH | pH | pH | pH | |
| --- | --- | --- | --- | --- | |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| High | Good | Moderate | Poor | Bad | |
| (5 and 95 percentile) | (5 and 95 percentile) | (10 percentile) | (10 percentile) | (10 percentile) | |
| ≥ 6 to ≤ 9 | ≥ 6 to ≤ 9 | 4.7 | 4.2 | < 4.2 | |
| Permitted abstraction per day as a percentage of the natural mean daily flow(Qn)[^f01003] | Permitted abstraction per day as a percentage of the natural mean daily flow(Qn)[^f01003] | Permitted abstraction per day as a percentage of the natural mean daily flow(Qn)[^f01003] | |||
| --- | --- | --- | |||
| (1)‘Qn’ is the naturalized mean daily flow for a specified period of record | (1)‘Qn’ is the naturalized mean daily flow for a specified period of record | (1)‘Qn’ is the naturalized mean daily flow for a specified period of record | |||
| (2)‘Qnx’ is the Qn that is expected to be exceeded by ‘x’ percent of the naturalized mean daily flows within a specified period of record | (2)‘Qnx’ is the Qn that is expected to be exceeded by ‘x’ percent of the naturalized mean daily flows within a specified period of record | (2)‘Qnx’ is the Qn that is expected to be exceeded by ‘x’ percent of the naturalized mean daily flows within a specified period of record | |||
| High | High | High | |||
| Column 1 | Column 2 | Column 3 | |||
| Column 1 | Maximum permitted % abstraction at Qn exceeding Qn95[^f01004] | Maximum permitted % abstraction at Qn notexceeding Qn95 | |||
| A1, A2 (downstream), A2 (headwaters), B1, B2, C2, D2 | 10 | 5 | |||
| abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) |
| --- | --- | --- | --- | --- | --- |
| Good | Good | Good | Good | Good | Good |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| River type | Maximum % abstraction at Qn exceeding Qn60 | Maximum % abstraction at Qn exceeding Qn70 | Maximum % abstraction at Qn exceeding Qn95 | Maximum % abstraction at Qn not exceeding Qn95 | |
| A1 | April-Oct | 30 | 25 | 20 | 15 |
| A1 | Nov-Mar | 35 | 30 | 25 | 20 |
| A2 (downstream), B1, B2 | April-Oct | 25 | 20 | 15 | 10 |
| A2 (downstream), B1, B2 | Nov-Mar | 30 | 25 | 20 | 15 |
| A2 (headwaters), C2, D2 | April-Oct | 20 | 15 | 10 | 7.5 |
| A2 (headwaters), C2, D2 | Nov-Mar | 25 | 20 | 15 | 10 |
| abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) |
| --- | --- | --- | --- | --- | --- |
| Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| River type | Maximum % abstraction at Qn exceeding Qn60 | Maximum % abstraction at Qn exceeding Qn70 | Maximum % abstraction at Qn exceeding Qn95 | Maximum % abstraction at Qn not exceeding Qn95 | |
| A1 | April-Oct | 55 | 50 | 45 | 40 |
| A1 | Nov-Mar | 60 | 55 | 50 | 45 |
| A2 (downstream), B1, B2, | April-Oct | 50 | 45 | 40 | 35 |
| A2 (downstream), B1, B2, | Nov-Mar | 55 | 50 | 45 | 40 |
| A2 (headwaters), C2, D2 | April-Oct | 45 | 40 | 35 | 32.5 |
| A2 (headwaters), C2, D2 | Nov-Mar | 50 | 45 | 40 | 35 |
| abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) |
| --- | --- | --- | --- | --- | --- |
| Poor | Poor | Poor | Poor | Poor | Poor |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| River type | Maximum % abstraction at Qn exceeding Qn60 | Maximum % abstraction at Qn exceeding Qn70 | Maximum % abstraction at Qn exceeding Qn95 | Maximum % abstraction at Qn not exceeding Qn95 | |
| A1 | April-Oct | 80 | 75 | 70 | 65 |
| A1 | Nov-Mar | 85 | 80 | 75 | 70 |
| A2 (downstream), B1, B2, | April-Oct | 75 | 70 | 65 | 60 |
| A2 (downstream), B1, B2, | Nov-Mar | 80 | 75 | 70 | 65 |
| A2 (headwaters), C2, D2 | April-Oct | 70 | 65 | 60 | 57.5 |
| A2 (headwaters), C2, D2 | Nov-Mar | 75 | 70 | 65 | 60 |
| abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) | abstraction per day as a percentage of the natural mean daily flow(Qn) |
| --- | --- | --- | --- | --- | --- |
| Bad | Bad | Bad | Bad | Bad | Bad |
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | |
| River type | Maximum % abstraction at Qn exceeding Qn60 | Maximum % abstraction at Qn exceeding Qn70 | Maximum % abstraction at Qn exceeding Qn95 | Maximum % abstraction at Qn not exceeding Qn95 | |
| A1 | April-Oct | >80 | >75 | >70 | >65 |
| A1 | Nov-Mar | >85 | >80 | >75 | >70 |
| A2 (downstream), B1, B2, | April-Oct | >75 | >70 | >65 | >60 |
| A2 (downstream), B1, B2, | Nov-Mar | >80 | >75 | >70 | >65 |
| A2 (headwaters), C2, D2 | April-Oct | >70 | >65 | >60 | >57.5 |
| A2 (headwaters), C2, D2 | Nov-Mar | >75 | >70 | >65 | >60 |
Environmental Standards for Lake Water Quality
| Status | Mean in July – August (mg/l) | Mean in July – August (mg/l) |
|---|---|---|
| Status | Salmonid | Cyprinid |
| High | 9 | 8 |
| Good | 7 | 6 |
| Moderate | 4 | 4 |
| Poor | 1 | 1 |
| Bad | < 1 | < 1 |
| Status | Proposed Boundary | |
| --- | --- | |
| Status | Annual Mean (micro Siemens per centimetre) | |
| Good | 1000 | |
| Annual mean concentration of total phosphorous (µg/l) | Annual mean concentration of total phosphorous (µg/l) | Annual mean concentration of total phosphorous (µg/l) |
| --- | --- | --- |
| Column 1 | Column 2 | Column 3 |
| High | Good | Moderate |
| R ÷ H; or 5, whichever value is the larger value | R ÷ G; or 8, whichever is the larger value | (R ÷ G) ÷ 0.5 |
| Annual mean concentration of total phosphorus (µg/l) | Annual mean concentration of total phosphorus (µg/l) | Annual mean concentration of total phosphorus (µg/l) |
| --- | --- | --- |
| Column 1 | Column 2 | Column 3 |
| Geological and depth category | High | Good |
| High alkalinity; shallow | 16 | 23 |
| High alkalinity; very shallow | 23 | 31 |
| Moderate alkalinity; deep | 8 | 12 |
| Moderate alkalinity; shallow | 11 | 16 |
| Moderate alkalinity; very shallow | 15 | 22 |
| Low alkalinity; deep | 5 | 8 |
| Low alkalinity; shallow | 7 | 10 |
| Low alkalinity; very shallow | 9 | 14 |
| Marl; shallow | 9 | 20 |
| Marl; very shallow | 10 | 24 |
| Good Lake Standards | Good Lake Standards | Good Lake Standards |
| --- | --- | --- |
| percentage reduction in mean daily inflow | percentage reduction in mean daily inflow | percentage reduction in mean daily inflow |
| Column 1 | Column 1 | Col 2 |
| Geology | Altitude | |
| Size | ||
| Basin form | ||
| Depth | ||
| Peat | Summer | Deep |
| Peat | Summer | Shallow |
| Peat | Winter | Deep |
| Peat | Winter | Shallow |
| Low Alkalinity | Summer | Deep |
| Low Alkalinity | Summer | Shallow |
| Low Alkalinity | Winter | Deep |
| Low Alkalinity | Winter | Shallow |
| Medium Alkalinity | Summer | Deep |
| Medium Alkalinity | Summer | Shallow |
| Medium Alkalinity | Winter | Deep |
| Medium Alkalinity | Winter | Shallow |
| High Alkalinity, Marl | Summer | Deep |
| High Alkalinity, Marl | Summer | Shallow |
| High Alkalinity, Marl | Winter | Deep |
| High Alkalinity, Marl | Winter | Shallow |
| Brackish | Summer | Deep |
| Brackish | Summer | Shallow |
| Brackish | Winter | Deep |
| Brackish | Winter | Shallow |
Environmental Standards for Transitional and Coastal Water Quality
| Dissolved oxygen concentrations (mg/l) as 5-percentile values | |
|---|---|
| High | 5.7 |
| Good | 4.0 |
| Moderate | 2.4 |
| Poor | 1.6 |
| Bad | <1.6 |
| Dissolved oxygen concentrations (mg/l) as 5-percentile values | |
| --- | --- |
| High | ≥5.7 |
| Good | ≥4.0 and <5.7 |
| Moderate | ≥2.4 and <4.0 |
| Poor | ≥1.6 and <2.4 |
| Bad | <1.6 |
| Mean dissolved inorganic nitrogen concentration (micromoles per litre) during the period 1st December to 28th February | |
| --- | --- |
| High | 12 |
| Good | 18 |
| Moderate | 30 |
| Poor | 40.5 |
| Bad | >40.5 |
Environmental Standards for Specific Pollutants
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
|---|---|---|---|
| (1)The standards for 2,4 D specified in Column 2 and Column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for 2,4 D specified in Column 2 and Column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for 2,4 D specified in Column 2 and Column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for 2,4 D specified in Column 2 and Column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2[^f01005] | Column 3 | Column 4[^f01005] |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 0.3 | 1.3 | 0.3 | 1.3 |
| Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | ||
| --- | --- | ||
| Column 1 | Column 2 | ||
| Annual mean (µg/l) | Annual mean (µg/l) | ||
| 20 | 20 | ||
| Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | ||
| --- | --- | ||
| (1)The standard for arsenic refers to the dissolved fraction of a water sample obtained by filtration through a 0.45µm filter or any equivalent pre-treatment | (1)The standard for arsenic refers to the dissolved fraction of a water sample obtained by filtration through a 0.45µm filter or any equivalent pre-treatment | ||
| Column 1[^f01006] | Column 2[^f01006] | ||
| Annual mean (µg/l) | Annual mean (µg/l) | ||
| 50 | 25 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standard for transitional and coastal waters | |
| --- | --- | --- | |
| (1)The standards for chlorine specified in Column 2 and 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for chlorine specified in Column 2 and 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for chlorine specified in Column 2 and 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | |
| (2)The term “total residual oxidants” refers to the sum of all oxidising agents existing in water, expressed as available chlorine. | (2)The term “total residual oxidants” refers to the sum of all oxidising agents existing in water, expressed as available chlorine. | (2)The term “total residual oxidants” refers to the sum of all oxidising agents existing in water, expressed as available chlorine. | |
| Column 1 | Column 2[^f01007] | Column 3[^f01007] | |
| Annual mean concentration (µg/l) of total available chlorine | 95-percentile concentration (µg/l) of total available chlorine | 95-percentile concentration (µg/l) of total residual oxidant[^f01008] | |
| 2 | 5 | 10 | |
| Good standard for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters | |
| --- | --- | --- | |
| (1)The standard for chromium VI specified in column 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standard for chromium VI specified in column 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standard for chromium VI specified in column 3 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | |
| Column 1 | Column 2 | Column 3[^f01009] | |
| Annual mean concentration (µg/l) of dissolved chromium VI | Annual mean concentration (µg/l) of dissolved chromium VI | 95-percentile concentration (µg/l) of dissolved chromium VI | |
| 3.4 | 0.6 | 32 | |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | ||
| --- | --- | ||
| (1)The standard for chromium III specified in column 2 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water | (1)The standard for chromium III specified in column 2 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water | ||
| Column 1 | Column 2[^f01010] | ||
| Annual mean concentration (µg/l) of dissolved chromium III | 95-percentile concentration (µg/l) of dissolved chromium III | ||
| 4.7 | 32 | ||
| Water hardness bands to which the corresponding river and freshwater lake standards in column 2 apply | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | |
| --- | --- | --- | |
| Column 1 | Column 2 | Column 3 | |
| Annual mean concentration of CaCO₃ (mg/l) | Annual mean concentration (µg/l) of dissolved copper | Annual mean concentration (µg/l) of dissolved copper | |
| 0 – 50 | 1 | 5 | |
| 50 – 100 | 6 | 5 | |
| 100 – 250 | 10 | 5 | |
| > 250 | 28 | 5 | |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| (1)The standards for cyanide specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for cyanide specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for cyanide specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for cyanide specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2[^f01011] | Column 3 | Column 4[^f01011] |
| Annual mean concentration (µg/l) of hydrogen cyanide | 95-percentile concentration (µg/l) of hydrogen cyanide | Annual mean concentration (µg/l) of hydrogen cyanide | 95-percentile concentration (µg/l) of hydrogen cyanide |
| 1 | 5 | 1 | 5 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| (1)The 95-percentile standards for cypermethrin must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The 95-percentile standards for cypermethrin must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The 95-percentile standards for cypermethrin must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The 95-percentile standards for cypermethrin must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2 | Column 3 | Column 4 |
| Annual mean (ng/l) | 0.1 | Annual mean (ng/l) | 0.1 |
| 95-percentile (ng/l)[^f01012] | 0.4 | 95-percentile (ng/l)[^f01012] | 0.41 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| (1)The standards for diazinon specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for diazinon specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for diazinon specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for diazinon specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2[^f01013] | Column 3 | Column 4[^f01013] |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 0.01 | 0.02 | 0.01 | 0.1 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| (1)The standards for dimethoate specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for dimethoate specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for dimethoate specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for dimethoate specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2[^f01014] | Column 3 | Column 4[^f01014] |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 0.48 | 4.0 | 0.48 | 4.0 |
| Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | ||
| --- | --- | ||
| Column 1 | Column 2 | ||
| Annual mean concentration (mg/l) of dissolved iron | Annual mean concentration (mg/l) of dissolved iron | ||
| 1 | 1 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| (1)The standards for linuron specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for linuron specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for linuron specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for linuron specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2[^f01015] | Column 3 | Column 4[^f01015] |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 0.5 | 0.9 | 0.5 | 0.9 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| (1)The standards for mecoprop specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for mecoprop specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for mecoprop specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for mecoprop specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2[^f01016] | Column 3 | Column 4[^f01016] |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 18 | 187 | 18 | 187 |
| Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | ||
| --- | --- | ||
| Column 1 | Column 2 | ||
| 95-percentile (µg/l) | 95-percentile (µg/l) | ||
| 0.01 | 0.01 | ||
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| (1)The standards for phenol specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for phenol specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for phenol specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for phenol specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2[^f01017] | Column 3 | Column 4[^f01017] |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 7.7 | 46 | 7.7 | 46 |
| Good standards for rivers and freshwater lakes | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | Good standards for transitional and coastal waters |
| --- | --- | --- | --- |
| (1)The standards for toluene specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for toluene specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for toluene specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. | (1)The standards for toluene specified in column 2 and column 4 must not be used for the purpose of classifying the ecological status or potential of bodies of surface water. |
| Column 1 | Column 2[^f01018] | Column 3 | Column 4[^f01018] |
| Annual mean (µg/l) | 95-percentile (µg/l) | Annual mean (µg/l) | 95-percentile (µg/l) |
| 50 | 380 | 40 | 370 |
| Water hardness to which the corresponding river and freshwater lake standards in column 2 apply[^f01019] | Good standards for rivers and freshwater lakes | Good standards for transitional and coastal waters | |
| --- | --- | --- | |
| (1)The standards applicable to intermediate water hardness must be calculated by simple linear interpolation. | (1)The standards applicable to intermediate water hardness must be calculated by simple linear interpolation. | (1)The standards applicable to intermediate water hardness must be calculated by simple linear interpolation. | |
| Column 1 | Column 2 | Column 3 | |
| Annual mean concentration of CaCO₃ (mg/l) | Annual mean concentration (µg/l) of total zinc | Annual mean concentration (µg/l) of dissolved zinc | |
| 0 – 50 | 8 | 40 | |
| 50 – 100 | 50 | 40 | |
| 100 – 250 | 75 | 40 | |
| > 250 | 125 | 40 | |
| Good standard for rivers and freshwater lakes | Good standard for transitional and coastal waters | ||
| --- | --- | ||
| Annual mean (µg/l) | Annual mean (µg/l) | ||
| Not applicable | 21 |
Environmental Standards for Priority Substances and other Substances
Reading this document does not replace reading the official text published on legislation.gov.uk. Contains public sector information licensed under the Open Government Licence v3.0. We assume no responsibility for any inaccuracies arising from the conversion of the original CLML XML to this format.
This text is published under legislation.gov.uk's own terms of reuse, not a Legalize or public-domain licence.
legislation.gov.uk
Open Government Licence v3.0 (attribution required)
© Crown and database right. Derived from content available under the Open Government Licence v3.0 from legislation.gov.uk.