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.
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.
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.
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.
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. The Department shall apply, as applicable, the dissolved inorganic nitrogen standards for “high”, “good”, “moderate”, “poor” or “bad” specified in Table 18 below to transitional or coastal waters or parts thereof.
13. The Department shall apply, as applicable, the standards for specific pollutants given in Tables 19 to 37 below to surface waters or parts thereof.
| 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. | |||||
| (10-percentile) | |||||
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type(1) | 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) | |||||
|---|---|---|---|---|---|
| (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)(i) | |||||
|---|---|---|---|---|---|
(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. | |||||
| (90-percentile) | |||||
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Type(ii) | 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) | |||||
|---|---|---|---|---|---|
| (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 | ||||
|---|---|---|---|---|
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
| High | Good | Moderate | Poor | Bad |
| (5 and 95 percentile) | (10 percentile) | (10 percentile) | (10 percentile) | |
| ≥ 6 to ≤ 9 | 4.7 | 4.2 | < 4.2 | |
| Permitted abstraction per day as a percentage of the natural mean daily flow(Qn)(1) | ||
|---|---|---|
(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 | ||
| High | ||
| Column 1 | Column 2 | Column 3 |
| Maximum permitted % abstraction at Qn exceeding Qn95(2) | Maximum permitted % abstraction at Qn not exceeding 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) | |||||
|---|---|---|---|---|---|
| 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 |
| Nov-Mar | 35 | 30 | 25 | 20 | |
| A2 (downstream), B1, B2 | April-Oct | 25 | 20 | 15 | 10 |
| Nov-Mar | 30 | 25 | 20 | 15 | |
| A2 (headwaters), C2, D2 | April-Oct | 20 | 15 | 10 | 7.5 |
| Nov-Mar | 25 | 20 | 15 | 10 | |
| abstraction per day as a percentage of the natural mean daily flow(Qn) | |||||
|---|---|---|---|---|---|
| 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 |
| Nov-Mar | 60 | 55 | 50 | 45 | |
| A2 (downstream), B1, B2, | April-Oct | 50 | 45 | 40 | 35 |
| Nov-Mar | 55 | 50 | 45 | 40 | |
| A2 (headwaters), C2, D2 | April-Oct | 45 | 40 | 35 | 32.5 |
| Nov-Mar | 50 | 45 | 40 | 35 | |
| abstraction per day as a percentage of the natural mean daily flow(Qn) | |||||
|---|---|---|---|---|---|
| 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 |
| Nov-Mar | 85 | 80 | 75 | 70 | |
| A2 (downstream), B1, B2, | April-Oct | 75 | 70 | 65 | 60 |
| Nov-Mar | 80 | 75 | 70 | 65 | |
| A2 (headwaters), C2, D2 | April-Oct | 70 | 65 | 60 | 57.5 |
| Nov-Mar | 75 | 70 | 65 | 60 | |
| abstraction per day as a percentage of the natural mean daily flow(Qn) | |||||
|---|---|---|---|---|---|
| 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 |
| Nov-Mar | >85 | >80 | >75 | >70 | |
| A2 (downstream), B1, B2, | April-Oct | >75 | >70 | >65 | >60 |
| Nov-Mar | >80 | >75 | >70 | >65 | |
| A2 (headwaters), C2, D2 | April-Oct | >70 | >65 | >60 | >57.5 |
| Nov-Mar | >75 | >70 | >65 | >60 | |
| Status | Mean in July – August (mg/l) | |
|---|---|---|
| Salmonid | Cyprinid | |
| High | 9 | 8 |
| Good | 7 | 6 |
| Moderate | 4 | 4 |
| Poor | 1 | 1 |
| Bad | < 1 | < 1 |
| Status | Proposed Boundary |
|---|---|
| Annual Mean (micro Siemens per centimetre) | |
| Good | 1000 |
| Annual mean concentration of total phosphorous (µg/l) | ||||
|---|---|---|---|---|
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
| High | Good | Moderate | Poor | Bad |
| R ÷ H; or 5, whichever value is the larger value | R ÷ G; or 8, whichever is the larger value | (R ÷ G) ÷ 0.5 | (R ÷ G) ÷ 0.25 | > (R ÷ G) ÷ 0.25 |
| Annual mean concentration of total phosphorus (µg/l) | |||||
|---|---|---|---|---|---|
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Geological and depth category | High | Good | Moderate | Poor | Bad |
| High alkalinity; shallow | 16 | 23 | 46 | 92 | > 92 |
| High alkalinity; very shallow | 23 | 31 | 62 | 124 | > 124 |
| Moderate alkalinity; deep | 8 | 12 | 24 | 48 | > 48 |
| Moderate alkalinity; shallow | 11 | 16 | 32 | 64 | > 64 |
| Moderate alkalinity; very shallow | 15 | 22 | 44 | 88 | > 88 |
| Low alkalinity; deep | 5 | 8 | 16 | 32 | > 32 |
| Low alkalinity; shallow | 7 | 10 | 20 | 40 | > 40 |
| Low alkalinity; very shallow | 9 | 14 | 28 | 56 | > 56 |
| Marl; shallow | 9 | 20 | 40 | 80 | > 80 |
| Marl; very shallow | 10 | 24 | 48 | 96 | > 96 |
| Good Lake Standards | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| percentage reduction in mean daily inflow | ||||||||||||||
| Column 1 | Col 2 | Col 3 | Col 4 | Col 5 | Col 6 | Col 7 | Col 8 | Col 9 | Col 10 | Col 11 | Col 12 | Col 13 | Col 14 | |
| Geology | Altitude | Low | Mid | High | ||||||||||
| Size | Small | Large | Small | Large | Small | Large | ||||||||
| Basin form | L | V | L | V | L | V | L | V | L | V | L | V | ||
| Depth | ||||||||||||||
| Peat | Summer | Deep | 15 | 15 | 15 | 10 | 15 | 15 | 15 | 10 | 15 | 15 | 15 | 10 |
| Shallow | 15 | 10 | 10 | 10 | 15 | 10 | 10 | 10 | 15 | 10 | 10 | 10 | ||
| Winter | Deep | 15 | 15 | 15 | 10 | 15 | 10 | 10 | 10 | 12 | 10 | 10 | 10 | |
| Shallow | 15 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 5 | ||
| Low Alkalinity | Summer | Deep | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 |
| Shallow | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | ||
| Winter | Deep | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | |
| Shallow | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | ||
| Medium Alkalinity | Summer | Deep | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Shallow | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | ||
| Winter | Deep | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | |
| Shallow | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | ||
| High Alkalinity, Marl | Summer | Deep | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 |
| Shallow | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | ||
| Winter | Deep | 30 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | |
| Shallow | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 20 | ||
| Brackish | Summer | Deep | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Shallow | 20 | 20 | 20 | 15 | 20 | 20 | 20 | 15 | 20 | 20 | 20 | 15 | ||
| Winter | Deep | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | |
| Shallow | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | ||
| 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 |
| Good standards for rivers and freshwater lakes | 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. | |||
| Column 1 | Column 2(1) | Column 3 | Column 4(1) |
| 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 | |
| Column 1(1) | Column 2(1) |
| Annual mean (µg/l) | Annual mean (µg/l) |
| 50 | 25 |
| 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. | ||
(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(1) | Column 3(1) |
| 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(2) |
| 2 | 5 | 10 |
| Good standard for rivers and freshwater lakes | 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. | ||
| Column 1 | Column 2 | Column 3(1) |
| 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 | |
|---|---|
(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(1) |
| 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 | |
| 100 – 250 | 10 | |
| > 250 | 28 |
| Good standards for rivers and freshwater lakes | 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. | |||
| Column 1 | Column 2(1) | Column 3 | Column 4(1) |
| 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 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. | |||
| Column 1 | Column 2 | Column 3 | Column 4 |
| Annual mean (ng/l) | 0.1 | Annual mean (ng/l) | 0.1 |
| 95-percentile (ng/l)(1) | 0.4 | 95-percentile (ng/l)(1) | 0.41 |
| Good standards for rivers and freshwater lakes | 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. | |||
| Column 1 | Column 2(1) | Column 3 | Column 4(1) |
| 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 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. | |||
| Column 1 | Column 2(1) | Column 3 | Column 4(1) |
| 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 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. | |||
| Column 1 | Column 2(1) | Column 3 | Column 4(1) |
| 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 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. | |||
| Column 1 | Column 2(1) | Column 3 | Column 4(1) |
| 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 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. | |||
| Column 1 | Column 2(1) | Column 3 | Column 4(1) |
| 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 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. | |||
| Column 1 | Column 2(1) | Column 3 | Column 4(1) |
| 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(1) | 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. | ||
| 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 | |
| 100 – 250 | 75 | |
| > 250 | 125 | |
| 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 |
| Name of substance | Chemical Abstracts Service number | All rivers and lakes | All transitional and coastal waters | ||
|---|---|---|---|---|---|
| Good | Good | ||||
| Annual mean(i) (AA-EQS) (µg/l) | Maximum allowable concentration(ii) (MAC-EQS) (µg/l) | Annual mean(i) (AA-EQS) (µg/l) | Maximum allowable concentration(ii) (MAC-EQS) (µg/l) | ||
(i) This parameter is the Environmental Quality Standard expressed as an annual average value (AA-EQS). Unless otherwise specified, it applies to the total concentrations of all isomers of the pollutant concerned. | |||||
(ii) This parameter is the Environmental Quality Standard expressed as a maximum allowable concentration (MAC-EQS). Where the MAC-EQS are marked as “not applicable”, the AA-EQS values are considered protective against short-term pollution peaks in continuous discharges since they are significantly lower than the values derived on the basis of acute toxicity. | |||||
(iii) For the group of priority substances covered by brominated diphenylethers listed in Decision 2455/2001/EC, an EQS is established only for congener numbers 28, 47, 99, 100, 153 and 154. | |||||
(iv) For cadmium and its compounds the EQS values vary dependent upon the hardness of the water as specified in five class categories (class 1: <40mg CaCO3/l, class 2: 40 to <50mg CaCO3/l, class 3: 50 to <100mg CaCO3/l, class 4: 100 to <200mg CaCO3/l and class 5: ≥200mg CaCO3/l). | |||||
(v) DDT total comprises the sum of the isomers 1,1,1-trichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 50-29-3; EU number 200-024-3); 1,1,1-trichloro-2 (o-chlorophenyl)-2-(p-chlorophenyl) ethane (CAS number 789-02-6; EU number 212-332-5); 1,1-dichloro-2,2 bis (p-chlorophenyl) ethylene (CAS number 72-55-9; EU number 200-784-6); and 1,1-dichloro-2,2 bis (p-chlorophenyl) ethane (CAS number 72-54-8; EU number 200-783-0). | |||||
(vi) If the Department does not apply standards for biota it shall introduce stricter standards for water in order to achieve the same level of protection as the standards for biota set out in regulation 4. The Department shall notify the European Commission of the reasons and basis for using this approach, the alternative standards used, the data and the methodology by which the alternative standards were derived and the categories of surface water to which they would apply. | |||||
Application of the standards set out in Table 37 For any given surface water body, applying the AA-EQS means that, for each representative monitoring point within the water body, the arithmetic mean of the concentrations measured at different times during the year does not exceed the standard. The calculation of the arithmetic mean, the analytical method used and, where there is no appropriate analytical method meeting the minimum performance criteria, the method of applying a standard must be in accordance with implementing acts adopting technical specifications for chemical monitoring and quality of analytical results, in accordance with the Water Framework Directive. For any given surface water body, applying the MAC-EQS means that the measured concentration at any representative monitoring point within the water body does not exceed the standard. However, in accordance with section 1.3.4. of Annex V to the Water Framework Directive, the Department may introduce statistical methods, such as a percentile calculation, to ensure an acceptable level of confidence and precision for determining compliance with the MAC-EQS. With the exception of cadmium, lead, mercury and nickel (hereinafter “metals”) the standards set out in Table 37 are expressed as total concentrations in the whole water sample. In the case of metals the standards refer to the dissolved concentration i.e. the dissolved phase of a water sample obtained by filtration through a 0.45 µm filter or any equivalent pre-treatment. The Department may, when assessing the monitoring results against the standards, take into account:
| |||||
| Alachlor | 15972-60-8 | 0.3 | 0.7 | 0.3 | 0.7 |
| Anthracene | 120-12-7 | 0.1 | 0.4 | 0.1 | 0.4 |
| Atrazine | 1912-24-9 | 0.6 | 2.0 | 0.6 | 2.0 |
| Benzene | 71-43-2 | 10 | 50 | 8 | 50 |
| Brominated diphenylether(iii) | 32534-81-9 | 0.0005 | not applicable | 0.0002 | not applicable |
| Cadmium and its compounds (depending on water hardness classes)(iv) | 7440-43-9 | ≤ 0.08 (class 1) 0.08 (class 2) 0.09 (class 3) 0.15 (class 4) 0.25 (class 5) | ≤ 0.45 (class 1) 0.45 (class 2) 0.6 (class 3) 0.9 (class 4) 1.5 (class 5) | 0.2 | ≤ 0.45 (class 1) 0.45 (class 2) 0.6 (class 3) 0.9 (class 4) 1.5 (class 5) |
| Carbon-tetrachloride | 56-23-5 | 12 | not applicable | 12 | not applicable |
| C10-13 Chloroalkanes | 85535-84-8 | 0.4 | 1.4 | 0.4 | 1.4 |
| Chlorfenvinphos | 470-90-6 | 0.1 | 0.3 | 0.1 | 0.3 |
| Chlorpyrifos (Chlorpyrifos-ethyl) | 2921-88-2 | 0.03 | 0.1 | 0.03 | 0.1 |
| Cyclodiene pesticides: | |||||
| Aldrin | 309-00-2 | Σ=0.01 | not applicable | Σ=0.005 | not applicable |
| Dieldrin | 60-57-1 | ||||
| Endrin | 72-20-8 | ||||
| Isodrin | 465-73-6 | ||||
| DDT total(v) | not applicable | 0.025 | not applicable | 0.025 | not applicable |
| Para-para-DDT | 50-29-3 | 0.01 | not applicable | 0.01 | not applicable |
| 1,2-Dichloroethane | 107-06-2 | 10 | not applicable | 10 | not applicable |
| Dichloromethane | 75-09-2 | 20 | not applicable | 20 | not applicable |
| Di(2-ethylhexyl)-phthalate (DEHP) | 117-81-7 | 1.3 | not applicable | 1.3 | not applicable |
| Diuron | 330-54-1 | 0.2 | 1.8 | 0.2 | 1.8 |
| Endosulfan | 115-29-7 | 0.005 | 0.01 | 0.0005 | 0.004 |
| Fluoranthene | 206-44-0 | 0.1 | 1 | 0.1 | 1 |
| Hexachloro-benzene | 118-74-1 | 0.01(vi) | 0.05 | 0.01(vi) | 0.05 |
| Hexachloro-butadiene | 87-68-3 | 0.1(vi) | 0.6 | 0.1(vi) | 0.6 |
| Hexachloro-cyclohexane | 608-73-1 | 0.02 | 0.04 | 0.002 | 0.02 |
| Isoproturon | 34123-59-6 | 0.3 | 1.0 | 0.3 | 1.0 |
| Lead and its compounds | 7439-92-1 | 7.2 | not applicable | 7.2 | not applicable |
| Mercury and its compounds | 7439-97-6 | 0.05(vi) | 0.07 | 0.05(vi) | 0.07 |
| Naphthalene | 91-20-3 | 2.4 | not applicable | 1.2 | not applicable |
| Nickel and its compounds | 7440-02-0 | 20 | not applicable | 20 | not applicable |
| Nonylphenol (4-Nonylphenol) | 104-40-5 | 0.3 | 2.0 | 0.3 | 2.0 |
| Octylphenol ((4-(1,1’,3,3’-tetramethylbutyl)-phenol)) | 140-66-9 | 0.1 | not applicable | 0.01 | not applicable |
| Pentachloro-benzene | 608-93-5 | 0.007 | not applicable | 0.0007 | not applicable |
| Pentachloro-phenol | 87-86-5 | 0.4 | 1 | 0.4 | 1 |
| Benzo(a)pyrene | 50-32-8 | 0.05 | 0.1 | 0.05 | 0.1 |
| Benzo(b)fluor-anthene | 205-99-2 | Σ=0.03 | not applicable | Σ=0.03 | not applicable |
| Benzo(k)fluor-anthene | 207-08-9 | ||||
| Benzo(g,h,i)-perylene | 191-24-2 | Σ=0.002 | not applicable | Σ=0.002 | not applicable |
| Indeno(1,2,3-cd)-pyrene | 193-39-5 | ||||
| Simazine | 122-34-9 | 1 | 4 | 1 | 4 |
| Tetrachloro-ethylene | 127-18-4 | 10 | not applicable | 10 | not applicable |
| Trichloro-ethylene | 79-01-6 | 10 | not applicable | 10 | not applicable |
| Tributyltin compounds (Tributhyltin-cation) | 36643-28-4 | 0.0002 | 0.0015 | 0.0002 | 0.0015 |
| Trichloro-benzenes | 12002-48-1 | 0.4 | not applicable | 0.4 | not applicable |
| Trichloro-methane | 67-66-3 | 2.5 | not applicable | 2.5 | not applicable |
| Trifluralin | 1582-09-8 | 0.03 | not applicable | 0.03 | not applicable |
| Name of Substance | Chemical Abstracts Service Number | All Rivers and Lakes Annual Mean Concentration (µg/l) | All transitional, coastal and relevant territorial waters(1) Annual Mean Concentration (µg/l) |
|---|---|---|---|
| Good | |||
(1) “relevant territorial waters” means the waters which extend seaward for 3 miles from the baselines from which the breadth of the territorial sea adjacent to Northern Ireland is measured. | |||
(2) The reference method of measurement shall be gas chromatography with electron capture detection after extraction by means of an appropriate solvent, or an alternative method that is at least as reliable. The limit of detection is 0.1 µg/litre. The accuracy and precision of the method shall be plus or minus 50% at a concentration which represents twice the value of the limit of determination. | |||
(3) Where samples are taken from more than one sampling point in relation to the waters in question, the standard shall be satisfied in relation to the samples from each sampling point. | |||
(4) Maximum Allowable Concentration | |||
Sampling and analysis of the substances set out in Table 38 Samples shall be taken at a frequency sufficient to show any changes in the aquatic environment, having regard in particular to natural variations in hydrological conditions. Where a discharge containing any substance listed is made to any river, lake or transitional, coastal or territorial water, samples shall be taken at a point sufficiently close to the discharge point to be representative of the quality of the aquatic environment in the area affected by the discharge. | |||
| Perchloroethylene(2) | 127-18-4 | 10 | 10 |
| Azinphos-methyl(3) | 86-50-0 | 0.01 | 0.01 |
| Demeton(3) | 8065-48-3 | 0.5 | 0.5 |
| Omethoate(3) | 1113-02-6 | 0.01 | Not determined |
| Triazophos(3) | 24017-47-8 | 0.005 | 0.005 |
| 4-chloro-3-methyl-phenol(3) | 59-50-7 | 40 | 40 |
| Bentazone(3) | 25057-89-0 | 500 | 500 |
| Fenitrothion(3) | 122-14-5 | 0.01 | 0.01 |
| 2-chlorophenol(3) | 95-57-8 | 50 | 50 |
| Biphenyl(3) | 92-52-4 | 25 | 25 |
| Malathion(3) | 121-75-5 | 0.01 | 0.02 |
| 1,1,1-trichloroethane(3) | 71-55-6 | 100 | 100 |
| Chloronitrotoluenes(3) | 89-60-1 | 10 | 10 |
| Triphenyltin and its derivatives(3) | 379-52-2 | 0.02(4) | 0.008(4) |
| 1,1,2-trichloroethane(3) | 79-00-5 | 400 | 300 |
| Dichlorvos(3) | 95828-55-0 | 0.001 | 0.04 0.6(4) |
| Xylene(3) | 1330-20-7 | 30 | 30 |