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The Water Framework Directive (Classification, Priority Substances and Shellfish Waters) Regulations (Northern Ireland) 2015

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PART 2Environmental 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 must 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 must 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 must 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 must 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.  The Department must apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” reactive phosphorus standard to that river or part thereof, calculated in accordance with the formula specified in sub paragraph (a)—

(a)RP standard = 10^((1.0497 x log10(A)+1.066) x (log10(reference condition RP)- log10(3,500)) + log10(3,500));

(b)In relation to the above formula—

“RP standard” is the annual mean concentration of reactive phosphorus in ug/l estimated for the lower class boundary of high, good, moderate and poor ecological status, depending on the value of “A” used;

“A” has the value 0.702 when calculating the standard for high; 0.532 when calculating the standard for good; 0.356 when calculating the standard for moderate; and 0.166 when calculating the standard for poor;

“reference condition RP” = 10^(0.454 (log10alk) – 0.0018 (altitude) + 0.476) and represents the annual mean concentration of reactive phosphorus at near natural conditions. If the predicted value of reference condition RP is <7ug/l, reference condition RP is set to 7ug/l;

“log10alk” means log10(alkalinity), where alkalinity is the concentration of CaCO3 in mg/l. For sites with an alkalinity greater than 250, alkalinity is set to 250. For sites with an alkalinity less than 2, it is set to 2;

“altitude” means the site’s altitude above sea level in metres. For sites with an altitude greater than 355 metres, altitude is set to 355 metres.

4.  The Department must apply, as applicable, the “high”, “good” “moderate” or “poor” temperature standards specified in columns 2, 3, 4 and 5 respectively of Table 4 below.

5.  The Department must apply, as applicable, the “high”, “good”, “moderate” or “poor” acid condition standards specified in columns 2, 3, 4 and 5 of Table 5 to any river or part thereof.

Environmental standards for river flows

6.—(1) Once the Department has, in accordance with paragraph 4 of Part 1 of this Schedule, assigned to a river or part thereof a Type specified in column 1 of Tables 6, 7, 8 or 9 below, it must apply, as applicable, the “high”, “good”, “moderate” or “poor” river flow standards as specified by the boundary values in those Tables to that river or part thereof.

(2) The Department may, when assessing the water balance results against the “high”, “good”, “moderate” and “poor” boundary values, take into account the spatial extent of the river flow standard based upon the contiguous length or percentage length of the river water body.

(3) 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

7.  The Department must apply, as applicable, the “high”, “good”, “moderate”, “poor” or “bad” dissolved oxygen standard specified in Table 10 below to all lakes or parts of such lakes.

8.  The Department must apply the “good” salinity standard specified in Table 11 below to all lakes or parts of such lakes.

9.  Once the Department has, in accordance with paragraph 5 of Part 1 of this Schedule, assigned to a lake or part thereof a geological category, depth category and colour category specified in Tables 5, 6 and 7 in that Part, it must 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 12 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.

10.  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 must 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 13 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

11.  Once the Department has assigned the characteristics of a lake or part thereof, in accordance with paragraph 7 of Part I of this Schedule, it must apply, as applicable, to the lake or part thereof the “high”, “good”, “moderate” or “poor” lake standards specified in columns 1,2, 3 and 4 of Table 14.

Environmental standards for transitional and coastal water quality

12.  The Department must apply, as applicable, the dissolved oxygen standards for “high”, “good”, “moderate”, “poor” or “bad” specified in Table 15 and Table 16 below to transitional or coastal waters or parts thereof.

13.  The Department must apply, as applicable, the dissolved inorganic nitrogen standards for “high”, “good”, “moderate”, “poor” or “bad” specified in Table 17 below to transitional or coastal waters or parts thereof.

Environmental standards for specific pollutants

14.  The Department must apply, as applicable, the standards for specific pollutants given in Tables 18 to 47 below to surface waters or parts thereof.

Environmental Standards for River Water Quality

Table 1
Standards for dissolved oxygen in rivers
Dissolved oxygen (percent saturation)
(1)

Where a lowland, high alkalinity river is a salmonid water the standards for the upland, low alkalinity type will apply.

(10-percentile)
Column 1Column 2Column 3Column 4Column 5Column 6
Type(1)HighGoodModeratePoorBad
Upland and low alkalinity80756450< 50
Lowland and high alkalinity70605445< 45
Table 2
Standards for ammonia in rivers
Total ammonia(1) (mg/l)
(1)

Note that Ammonia is a Specific Pollutant and considered as such for compliance. It is included in this section as it is commonly assessed alongside the other inorganic chemistry elements.

(90-percentile)
Column 1Column 2Column 3Column 4Column 5Column 6
TypeHighGoodModeratePoorBad
Upland and low alkalinity0.20.30.751.1> 1.1
Lowland and high alkalinity0.30.61.12.5> 2.5
Table 3
Standards for Biochemical Oxygen Demand in rivers
Biochemical oxygen demand (mg/l)(1)
(1)

The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen.

(2)

Where a lowland, high alkalinity river is a salmonid water the standards for the upland, low alkalinity type will apply.

(90-percentile)
Column 1Column 2Column 3Column 4Column 5Column 6
Type(2)HighGoodModeratePoorBad
Upland and low alkalinity3467.5> 7.5
Lowland and high alkalinity456.59> 9
Table 4
Standards for temperature in rivers
Temperature (◦C) as an annual 98th percentile standard
Column 1Column 2Column 3Column 4Column 5
TypeHighGoodModeratePoor
Salmonid waters20232830
Cyprinid waters25283032
Table 5
Standards for acid conditions in rivers. Either pH or Acid Neutralising Capacity (ANC) or both may be used
Clear waters(1)Humic waters(2)
Column 1Column 2Column 3Column 4Column 5
(1)

Waters with a Dissolved Organic Carbon Value of 10mg/l or less

(2)

Waters with a Dissolved Organic Carbon Value of greater than 10mg/l

(3)

As assessed by the Cantrell method

(4)

A 95% upper limit of 9 also applies

Annual mean
pHANC(3)pHANC(3)
High6.60(4)805.10(4)80
Good5.95404.5550
Moderate5.44154.2210
Poor4.89-104.035
Table 6
High environmental standards for river flows
Permitted abstraction per day as a percentage of the natural mean daily flow(Q)(1)
(1)

‘Q’ is the mean daily flow for a specified period of time

(2)

‘Qx’ is the Q that is expected to be exceeded by ‘x’ percent for a specified period of time

High
Column 1Column 2Column 3
Maximum permitted % abstraction at Q exceeding Q95(2)Maximum permitted % abstraction at Q not exceeding Q95
A1, A2 (downstream), A2 (headwaters), B1, B2, C2, D2105
Table 7
Good environmental standards for river flows
Permitted abstraction per day as a percentage of the natural mean daily flow(Q)
Good
Column 1Column 2Column 3Column 4Column 5
River typeMaximum % abstraction at Q exceeding Q60Maximum % abstraction at Q exceeding Q70Maximum % abstraction at Q exceeding Q95Maximum % abstraction at Q not exceeding Q95
A135302520
A2 (downstream), B1, B230252015
A2 (headwaters), C2, D225201510
Table 8
Moderate environmental standards for river flows
Permitted abstraction per day as a percentage of the natural mean daily flow(Q)
(1)

incremental increase in allowable take at flows <Q60 to ≥ Q90

Moderate
Column 1Column 2Column 3Column 4Column 5
River typeMaximum % abstraction at Q exceeding Q60Maximum % abstraction at Q exceeding Q70Maximum % abstraction at Q exceeding Q95Maximum % abstraction at Q not exceeding Q95
A17050-70(1)5045
A2 (downstream), B1, B2,7045-70(1)4540
A2 (headwaters), C2, D27040-70(1)4035
Table 9
Poor environmental standards for river flows
Permitted abstraction per day as a percentage of the natural mean daily flow(Q)
Poor
Column 1Column 2Column 3Column 4Column 5
River typeMaximum % abstraction at Q exceeding Q60Maximum % abstraction at Q exceeding Q90Maximum % abstraction at Q exceeding Q95Maximum % abstraction at Q not exceeding Q95
A1Qx less 25% of Q90Qx less 25% of Q907570
A2 (downstream), B1, B2,Qx less 30% of Q90Qx less 30% of Q907065
A2 (headwaters), C2, D2Qx less 35% of Q90Qx less 35% of Q906560

Environmental Standards for Lake Water Quality

Table 10
Standards for dissolved oxygen in lakes
StatusMean in July – August (mg/l)
Salmonid watersCyprinid waters
High98
Good76
Moderate44
Poor11
Bad< 1< 1
Table 11
Salinity Standards for lakes with no natural saline influence
StatusProposed Boundary
Annual Mean (micro Siemens per centimetre)
Good1000
Table 12
Total phosphorus standards for lakes
Annual mean concentration of total phosphorous (µg/l)
Column 1Column 2Column 3Column 4Column 5
HighGoodModeratePoorBad
R ÷ H; or 5, whichever is the larger valueR ÷ G; or 8, whichever is the larger value(R ÷ G) ÷ 0.5(R ÷ G) ÷ 0.25> (R ÷ G) ÷ 0.25
Table 13
Type-specific total phosphorus standards for lakes where the standards specified in Table 12 above do not apply
Annual mean concentration of total phosphorus (µg/l)
Column 1Column 2Column 3Column 4Column 5Column 6
Geological and depth categoryHighGoodModeratePoorBad
High alkalinity; shallow16234692> 92
High alkalinity; very shallow233162124> 124
Moderate alkalinity; deep8122448> 48
Moderate alkalinity; shallow11163264> 64
Moderate alkalinity; very shallow15224488> 88
Low alkalinity; deep581632> 32
Low alkalinity; shallow7102040> 40
Low alkalinity; very shallow9142856> 56
Marl; shallow9204080> 80
Marl; very shallow10244896> 96
Table 14
Environmental standards for lake water levels
Daily maximum % reduction in the habitable zone lake surface area for 99% of the days in any year
(1)

The reference conditions lake surface area means the natural lake surface area in the absence of any abstractions, discharges or other man-made influences

Column 1Column 2Column 3Column 4
HighGoodModeratePoor
151020

The habitable zone lake surface is dependent on whether the lake is considered to have the geological sub-type “Peat” or “Non-Peat”.

The habitable zone lake surface area means the proportion of the reference conditions(1) lake surface area from the shore to a depth 5 metres deeper than the depth to which light penetration to the lake bed would be sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae.

In the absence of field data to the contrary, the depth to which light penetration to the lake bed is sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae may be taken to be 2 metres for lakes with the geological sub-type of “Peat” and 7 metres for “Non-Peat” lakes. The lake habitable zone extends 5m below the level of light penetration to account for impacts on the aphotic habitat.

Environmental Standards for Transitional and Coastal Water Quality

Table 15
Dissolved oxygen standards for transitional and coastal waters with salinities normalised to 35
Dissolved oxygen concentrations (mg/l) as 5-percentile values
High5.7
Good4.0
Moderate2.4
Poor1.6
Bad<1.6
Table 16
Dissolved oxygen standards for transitional and coastal waters with salinities <35
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
Table 17
Dissolved inorganic nitrogen standards for coastal waters with salinities from 30-34.5 normalised to salinity of 32, and transitional waters with salinities < 30 normalised to a salinity of 25.
Mean dissolved inorganic nitrogen concentration (micromoles per litre) during the period 1st December to 28th February
High12
Good18
Moderate30
Poor40.5
Bad>40.5

Environmental Standards for Specific Pollutants

Table 18
Environmental standards for 2,4-Dichlorophenoxyacetic acid (2,4-D)
Good standards for rivers and freshwater lakesGood 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 1Column 2(1)Column 3Column 4(1)
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
0.31.30.31.3
Table 19
Environmental standards for 2,4-Dichlorophenol
Good standard for rivers and freshwater lakesGood standard for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
4.21400.426
Table 20
Environmental standards for 3,4-Dichloroaniline
Good standard for rivers and freshwater lakesGood standard for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
0.25.40.25.4
Table 21
Environmental standards for arsenic (dissolved)
Good standard for rivers and freshwater lakesGood 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)
5025
Table 22
Environmental standards for benzyl butyl phthalate
Good standard for rivers and freshwater lakesGood standard for transitional and coastal waters
Column 1Column 2Column 1Column 2
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
7.5510.7510
Table 23
Environmental standards for carbendazim
Good standards for rivers and freshwater lakes
Column 1Column 2
Annual mean (µg/l)95-percentile (µg/l)
0.150.7
Table 24
Environmental standards for chlorine
Good standards for rivers and freshwater lakesGood 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 1Column 2(1)Column 3(1)
Annual mean concentration (µg/l) of total available chlorine95-percentile concentration (µg/l) of total available chlorine95-percentile concentration (µg/l) of total residual oxidant(2)
2510
Table 25
Environmental standards for chlorothalonil
Good standards for rivers and freshwater lakes
Column 1Column 2
Annual mean (µg/l)95-percentile (µg/l)
0.0351.2
Table 26
Environmental standards for chromium III
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 1Column 2(1)
Annual mean concentration (µg/l) of dissolved chromium III95-percentile concentration (µg/l) of dissolved chromium III
4.732
Table 27
Environmental standards for chromium VI
Good standard for rivers and freshwater lakesGood 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 1Column 2Column 3(1)
Annual mean concentration (µg/l) of dissolved chromium VIAnnual mean concentration (µg/l) of dissolved chromium VI95-percentile concentration (µg/l) of dissolved chromium VI
3.40.632
Table 28
Environmental standards for copper
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters(2)
(1)

bioavailable means the fraction of the dissolved concentration of copper likely to result in toxic effects as determined using the Metal Bioavailability Assessment Tool (also referred to as a PNEC Estimator) for copper.

(2)

The recommended salt water standard applies to the fraction of a water sample that passes through a 0.45-µm filter or that is obtained by any equivalent pre-treatment.

(3)

“DOC” means the annual mean concentration of dissolved organic carbon in mg/l.

Column 2Column 3
Annual mean concentration (µg/l) of dissolved copperAnnual mean concentration (µg/l) of dissolved copper
1(bioavailable)(1)3.76 µg/l dissolved, where DOC(3) ≤ 1 mg/l
3.76 +(2.677 × ((DOC/2) - 0.5)) µg/l dissolved, where DOC > 1 mg/l
Table 29
Environmental standards for cyanide
Good standards for rivers and freshwater lakesGood 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 1Column 2(1)Column 3Column 4(1)
Annual mean concentration (µg/l) of ‘free’ cyanide (HCN and CN)95-percentile concentration (µg/l) of ‘free’cyanide (HCN and CN)Annual mean concentration (µg/l) of hydrogen cyanide95-percentile concentration (µg/l) of hydrogen cyanide
1515
Table 30
Environmental standards for cypermethrin
Good standards for rivers and freshwater lakes(1) (2)Good standards for transitional and coastal waters(1) (2)
(1)

Cypermethrin ceases to be a specific pollutant from 22 December 2018, when it shall be listed as a priority substance.

(2)

The standards for cypermethrin specified in column 2 and column 4 must not be used for the purposes of classifying the ecological status or potential of bodies of surface water.

Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
0.10.40.10.41
Table 31
Environmental standards for diazinon
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
0.010.020.010.26
Table 32
Environmental standards for dimethoate
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
0.484.00.484.0
Table 33
Environmental standards for glyhosate
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
196398196398
Table 34
Environmental standards for iron
Good standard for rivers and freshwater lakesGood standard for transitional and coastal waters
Column 1Column 2
Annual mean concentration (mg/l) of dissolved ironAnnual mean concentration (mg/l) of dissolved iron
11
Table 35
Environmental standards for linuron
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
0.50.90.50.9
Table 36
Environmental standards for manganese
Good standard for rivers and freshwater lakes
(1)

bioavailable means the fraction of the dissolved concentration of manganese likely to result in toxic effects as determined in accordance with the Metal Bioavailability Assessment Tool for manganese.

Annual mean (µg/l) bioavailable
123(1)
Table 37
Environmental standards for mecoprop
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
1818718187
Table 38
Environmental standards for methiocarb
Good standards for rivers and freshwater lakes
Column 1Column 2
Annual mean (µg/l)95-percentile (µg/l)
0.010.77
Table 39
Environmental standards for pendimethalin
Good standards for rivers and freshwater lakes
Column 1Column 2
Annual mean (µg/l)95-percentile (µg/l)
0.30.58
Table 40
Environmental standards for permethrin
Good standard for rivers and freshwater lakesGood standard for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
0.0010.010.00020.001
Table 41
Environmental standards for phenol
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
7.7467.746
Table 42
Environmental standards for tetrachloroethane (TCE)
Good standards for rivers and freshwater lakes
Column 1Column 2
Annual mean (µg/l)95-percentile (µg/l)
1401848
Table 43
Environmental standards for toluene
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
7438074370
Table 44
Environmental standards for triclosan
Good standard for rivers and freshwater lakesGood standard for transitional and coastal waters
Column 1Column 2Column 3Column 4
Annual mean (µg/l)95-percentile (µg/l)Annual mean (µg/l)95-percentile (µg/l)
0.10.280.10.28
Table 45
Environmental standards for un-ionised ammonia as nitrogen
Good standard for rivers and freshwater lakesGood standard for transitional and coastal waters
Annual mean (µg/l)Annual mean (µg/l)
Not applicable21
Table 46
Environmental standards for zinc
Good standards for rivers and freshwater lakesGood standards for transitional and coastal waters
(1)

bioavailable means the fraction of the dissolved concentration of zinc likely to result in toxic effects as determined using the Metal Bioavailability Assessment Tool (also referred to as a PNEC Estimator) for zinc.

(2)

Ambient Background Concentration is an estimate of background levels of zinc based on a low percentile of monitoring data. A figure of 1 µg/l has been estimated for freshwaters in Northern Ireland.

Column 1Column 2
Annual meanAnnual mean
10.9 bioavailable(1) plus Ambient Background Concentration(2) (µg/l) dissolved6.8 dissolved plus Ambient Background Concentration (µg/l)

Environmental Standards for Priority Substances and other Substances

Table 47
Environmental quality standards for priority substances and other substances for which standards have been set at EU-level
Column 1Column 2Column 3Column 4Column 5Column 6Column 7Column 8Column 9
NumberName of substanceChemical Abstracts Service numberDate from which standards applyAll rivers and lakesAll transitional and coastal watersEQS Biota(11)
GoodGood
AA-EQS (µg/l)(1) Inland surface waters(2)MAC-EQS (µg/l)(3) Inland surface waters(2)AA-EQS (µg/l)(1)MAC-EQS (µg/l)(3)
(1)

This parameter is the EQS expressed as an annual average value (AA-EQS). Unless otherwise specified, it applies to the total concentration of all isomers.

(2)

Inland surface waters encompass rivers and lakes and related artificial or heavily modified water bodies.

(3)

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.

(4)

For the group of priority substances covered by brominated diphenylethers (No 5), the EQS refers to the sum of the concentrations of congener numbers 28, 47, 99, 100, 153 and 154.

(5)

For cadmium and its compounds (No 6) 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).

(6)

This substance is not a priority substance but one of the other pollutants for which the EQS are identical to those laid down in the legislation that applied prior to 13 January 2009.

(7)

No indicative parameter is provided for this group of substances. The indicative parameter(s) must be defined through the analytical method.

(8)

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).

(9)

There is insufficient information available to set a MAC-EQS for these substances.

(10)

For the group of priority substances of polyaromatic hydrocarbons (PAH) (No 28), the biota EQS and corresponding AA-EQS in water refer to the concentration of benzo(a)pyrene, on the toxicity of which they are based. Benzo(a)pyrene can be considered as a marker for the other PAHs, hence only benzo(a)pyrene needs to be monitored for comparison with the biota EQS or the corresponding AA-EQS in water.

(11)

Unless otherwise indicated, the biota EQS relate to fish. An alternative biota taxon, or another matrix, may be monitored instead, as long as the EQS applied provides an equivalent level of protection. For substances numbered 15 (Fluoranthene) and 28 (PAHs), the biota EQS refers to crustaceans and molluscs. For the purpose of assessing chemical status, monitoring of Fluoranthene and PAHs in fish is not appropriate. For substance number 37 (Dioxins and dioxin-like compounds), the biota EQS relates to fish, crustaceans and molluscs, in line with section 5.3 of the Annex to Commission Regulation (EU) No 1259/2011 of 2 December 2011 amending Regulation (EC) No 1881/2006 as regards maximum levels for dioxins, dioxin-like PCBs and non-dioxin-like PCBs in foodstuffs (OJ L 320, 3.12.2011, P.18).

(12)

These EQS refer to bioavailable concentrations of the substances.

(13)

PCDD: polychlorinated dibenzo-p-dioxins; PCDF: polychlorinated dibenzofurans; PCB-DL: dioxin-like polychlorinated biphenyls; TEQ: toxic equivalents according to the World Health Organisation 2005 Toxic Equivalence Factors.

Application of the standards set out in Table 47

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. Where the Department introduces statistical methods, such methods must apply with rules laid down in accordance with the examination procedure referred to in Article 9(2) of Directive 2008/105/EC.

With the exception of cadmium, lead, mercury and nickel (hereinafter “metals”) the standards set out in Table 47 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, or, where specifically indicated, to the bioavailable concentration.

The Department may, when assessing the monitoring results against the standards, take into account:

  • natural background concentrations for metals and their compounds, if they prevent compliance with the standard; and

  • hardness, pH, dissolved organic carbon or other water quality parameters that affect the bioavailability of metals, the bioavailable concentrations being determined using appropriate bioavailability modelling.

1Alachlor15972-60-80.30.70.30.7
2Anthracene120-12-714/09/15-21/12/150.10.40.10.4
22/12/15 onwards0.10.10.10.1
3Atrazine1912-24-90.62.00.62.0
4Benzene71-43-21050850
5Brominated diphenylethers(4)32534-81-914/09/15-21/12/150.0005not applicable0.0002not applicable
22/12/15 onwardsnot applicable0.14not applicable0.0140.0085
6Cadmium and its compounds (depending on water hardness classes)(5)7440-43-9

≤ 0.08

(class 1)

≤ 0.45

(class 1)

0.2

≤ 0.45

(class 1)

0.08

(class 2)

0.45

(class 2)

0.45

(class 2)

0.09

(class 3)

0.6

(class 3)

0.6

(class 3)

0.15

(class 4)

0.9

(class 4)

0.9

(class 4)

0.25

(class 5)

1.5

(class 5)

1.5

(class 5)

6aCarbon-tetrachloride(6)56-23-512not applicable12not applicable
7

C10-13

Chloroalkanes(7)

85535-84-80.41.40.41.4
8Chlorfenvinphos470-90-60.10.30.10.3
9Chlorpyrifos (Chlorpyrifos-ethyl)2921-88-20.030.10.030.1
9aCyclodiene pesticides:Σ=0.01not applicableΣ=0.005not applicable
Aldrin(6)309-00-2
Dieldrin(6)60-57-1
Endrin(6)72-20-8
Isodrin(6)465-73-6
9bDDT total(6) (8)not applicable0.025not applicable0.025not applicable
Para-para-DDT(6)50-29-30.01not applicable0.01not applicable
101,2-Dichloroethane107-06-210not applicable10not applicable
11Dichloro-methane75-09-220not applicable20not applicable
12Di(2-ethylhexyl)-phthalate (DEHP)117-81-71.3not applicable1.3not applicable
13Diuron330-54-10.21.80.21.8
14Endosulfan115-29-70.0050.010.00050.004
15Fluoranthene206-44-014/09/15-21/12/150.110.11
22/12/15 onwards0.00630.120.00630.1230
16Hexachlorobenzene118-74-10.050.0510
17Hexachlorobutadiene87-68-30.60.655
18Hexachloro-cyclohexane608-73-10.020.040.0020.02
19Isoproturon34123-59-60.31.00.31.0
20Lead and its compounds7439-92-114/09/15-21/12/157.2not applicable7.2not applicable
22/12/15 onwards1.2(12)141.314
21Mercury and its compounds7439-97-60.070.0720
22Naphthalene91-20-314/09/15-21/12/152.4not applicable1.2not applicable
22/12/15 onwards21302130
23Nickel and its compounds7440-02-014/09/15-21/12/1520not applicable20not applicable
22/12/15 onwards4(12)348.634
24

Nonylphenol

(4-Nonylphenol)

104-40-50.32.00.32.0
25

Octylphenol

((4-(1,1’,3,3’-tetramethylbutyl)-phenol))

140-66-90.1not applicable0.01not applicable
26Pentachlorobenzene608-93-50.007not applicable0.0007not applicable
27Pentachlorophenol87-86-50.410.41
28Polyaromatic hydrocarbons (PAH)(10)-not applicablenot applicablenot applicablenot applicable

Benzo(a)pyrene

50-32-814/09/15-21/12/150.050.10.050.1
22/12/15 onwards1.7 x 10-40.271.7 x 10-40.0275
Benzo(b)fluor-anthene205-99-214/09/15-21/12/15Σ=0.03not applicableΣ=0.03not applicable
22/12/15 onwardssee footnote 100.017see footnote 100.017see footnote 10
Benzo(k)fluor-anthene207-08-914/09/15-21/12/15Σ=0.03not applicableΣ=0.03not applicable
22/12/15 onwardssee footnote 100.017see footnote 100.017see footnote 10
Benzo(g,h,i)-perylene191-24-214/09/15-21/12/15Σ=0.02not applicableΣ=0.02not applicable
22/12/15 onwardssee footnote 108.2 x 10-3see footnote 108.2 x 10-4see footnote 10
Indeno(1,2,3-cd)-pyrene193-39-514/09/15-21/12/15Σ=0.02not applicableΣ=0.02not applicable
22/12/15 onwardssee footnote 10not applicablesee footnote 10not applicablesee footnote 10
29Simazine122-34-91414
29aTetrachloroethylene(6)127-18-410not applicable10not applicable
29bTrichloroethylene(6)79-01-610not applicable10not applicable
30Tributyltin compounds (Tributhyltin-cation)36643-28-40.00020.00150.00020.0015
31Trichlorobenzenes12002-48-10.4not applicable0.4not applicable
32Trichloromethane67-66-32.5not applicable2.5not applicable
33Trifluralin1582-09-80.03not applicable0.03not applicable
34Dicofol115-32-222/12/18 onwards1.3 x 10-3not applicable(9)3.2 x 10-5not applicable(9)33
35Perfluorooctane sulfonic acid and its derivatives (PFOS)1763-23-122/12/18 onwards6.5 x 10-4361.3 x 10-47.29.1
36Quinoxyfen124495-18-722/12/18 onwards0.152.70.0150.54
37Dioxins and dioxin-like compoundsSee footnote 9 in Annex X to Directive 2000/60/EC22/12/18 onwardsnot applicablenot applicableSum of PCDD +PCDF+PCB-DL 0.0065 µg.kg-1 TEQ (13)
38Aclonifen74070-46-522/12/18 onwards0.120.120.0120.012
39Bifenox42576-02-322/12/18 onwards0.0120.040.00120.004
40Cybutryne28159-98-022/12/18 onwards0.00250.0160.00250.016
41Cypermethrin52315-07-822/12/18 onwards8 x 10-56 x 10-48 x 10-66 x 10-5
42Dichlorvos62-73-722/12/18 onwards6 x 10-47 x 10-46 x 10-57 x 10-5
43Hexabromo-cyclododecane (HBCDD)See footnote 11 in Annex X to Directive 2000/60/EC22/12/18 onwards0.00160.50.00080.05167
44Heptachlor and heptachlor epoxide76-44-8 /1024-57-322/12/18 onwards2 x 10-73 x 10-41 x 10-83 x 10-56.7 x 10-3
45Terbutryn886-50-022/12/18 onwards0.0650.340.00650.034

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