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The Private Water Supplies Regulations (Northern Ireland) 2009
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Regulation 5
SCHEDULE 1Concentrations and Values
This schedule has no associated Explanatory Memorandum
PART 1Wholesomeness
TABLE A
MICROBIOLOGICAL PARAMETERS
Directive requirements – Prescribed concentrations and values
| Parameters | Maximum concentration or value | Units of Measurement |
|---|---|---|
| Escherichia coli (E. coli) | 0 | Number/100ml |
| Enterococci | 0 | Number/100ml |
TABLE B
CHEMICAL PARAMETERS
Directive requirements – Prescribed concentrations and values
| Parameters | Maximum concentration or value | Units of Measurement |
|---|---|---|
(1) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | ||
(2) See also the nitrate-nitrite formula in regulation 5(c) | ||
(3) For these purposes “Pesticides” means— (a) organic insecticides, (b) organic herbicides, (c) organic fungicides, (d) organic nematocides, (e) organic acaricides, (f) organic algicides, (g) organic rodenticides, (h) organic slimicides, (i) related products (inter alia, growth regulators) And their relevant metabolites, degradation and reaction products. Only those pesticides which are likely to be present in a given supply need to be monitored. | ||
(4) “Pesticides total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process. | ||
(5) The specified compounds are: (a) benzo(b)fluoranthene (b) benzo(k)fluoranthene (c) benzo(ghi)perylene (d) indeno(1,2,3-cd)pyrene. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ||
(6) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ||
(7) The specified compounds are: (a) chloroform (b) bromoform (c) dibromochloromethane (d) bromodichloromethane The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ||
| Acrylamide (1) | 0.10 | μg/l |
| Antimony | 5.0 | μgSb/l |
| Arsenic | 10 | μgAs/l |
| Benzene | 1.0 | μg/l |
| Benzo(a)pyrene | 0.010 | μg/l |
| Boron | 1.0 | mgB/l |
| Bromate | 10 | μgBrO3/l |
| Cadmium | 5.0 | μgCd/l |
| Chromium | 50 | μgCr/l |
| Copper | 2.0 | mgCu/l |
| Cyanide | 50 | μgCN/l |
| 1, 2 dichloroethane | 3.0 | μg/l |
| Epichlorohydrin (1) | 0.10 | μg/l |
| Fluoride | 1.5 | mgF/l |
| Lead | (a) 25 until immediately before 25th December 2013 | μgPb/l |
| (b) 10, on and after 25th December 2013 | μgPb/l | |
| Mercury | 1.0 | μgHg/l |
| Nickel | 20 | μgNi/l |
| Nitrate (2) | 50 | mgNO3/l |
| Nitrite | 0.5 | mgNO2/l |
| Pesticides (3) | ||
| 0.030 | μg/l |
| 0.030 | μg/l |
| 0.030 | μg/l |
| 0.030 | μg/l |
| 0.10 | μg/l |
| 0.50 | μg/l |
| Polycyclic aromatic hydrocarbons (5) | 0.10 | μg/l |
| Selenium | 10 | μgSe/l |
| Tetrachloroethene and Trichloroethene (6) | 10 | μg/l |
| Trihalomethanes: Total (7) | 100 | μg/l |
| Vinyl chloride (1) | 0.50 | μg/l |
National requirements – Prescribed concentrations and values
| Parameters | Maximum concentration or value or state | Units of Measurement |
|---|---|---|
(1) Ex water treatment works only. (See also the nitrate-nitrite formula in regulation 5(c)) | ||
| Aluminium | 200 | μgAl/l |
| Colour | 20 | mg/l Pt/Co |
| Iron | 200 | μgFe/l |
| Manganese | 50 | μgMn/l |
| Nitrite (1) | 0.10 | mgNO2/l |
| Odour | Acceptable and no abnormal change | |
| Sodium | 200 | mgNa/l |
| Taste | Acceptable and no abnormal change | |
| Tetrachloromethane | 3 | μg/l |
| Turbidity | 4 | NTU |
PART 2Indicator Parameters
| Parameters | Maximum concentration or value or state (unless otherwise stated) | Units of measurement |
|---|---|---|
(1) The water should not be aggressive. | ||
(2) Excluding tritium, potassium-40, radon and radon decay products. | ||
(3) Only in the case of surface water treatment where the parametric value should be strived for in the water ex-treatment works. | ||
| Ammonium | 0.50 | mgNH4/l |
| Chloride (1) | 250 | mgCl/l |
Clostridium perfringens (including spores) | 0 | Number/100ml |
| Coliform bacteria | 0 | Number/100ml |
| Colony counts | No abnormal change No abnormal change | Number/1ml at 22°C Number/1ml at 37°C |
| Conductivity (1) | 2,500 | μS/cm at 20°C |
| Hydrogen ion | 9.5 | pH value |
| 6.5 (minimum) | pH value | |
| Sulphate (1) | 250 | mgSO4/l |
| Total indicative dose (for radioactivity) (2) | 0.10 | mSv/year |
| Total organic carbon (TOC) | No abnormal change | mgC/l |
Tritium (for radioactivity) | 100 | Bq/l |
| Turbidity (3) | 1 | NTU |
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