(1) Item No. | (2) Parameter | (3) Circumstances in which parameter is likely to be present | (4) Conditions to be satisfied before a decision may be made |
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(1) | Acrylamide | | |
(2) | Aluminium | | |
(3) | Antimony | | |
(4) | Arsenic | Arsenic is introduced into drinking water sources primarily through the dissolution of naturally occurring minerals and ores. Arsenic in drinking water is a significant source of health effects in some areas. Arsenic is considered to be a high-priority substance for screening in drinking water sources. Concentrations are highly dependent on the depth to which a well or borehole is sunk.
| If the monitoring local authority is satisfied that arsenic is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(5) | Benzene | Benzene is used principally in the production of other organic chemicals. As benzene is present in petrol, vehicular emissions constitute the main source of the chemical in the environment. Benzene may be introduced into water by industrial effluents and atmospheric pollution.
| Where the source of the supply comprises groundwater (well, spring, borehole or similar) the area in which the source is located must be an area devoid of industrial activity (current or historic) or hydrocarbon stores (current or historic) eg, underground petroleum tanks. Where the source of the supply comprises surface water, the area in which the source is located must be an area remote from areas of industrial activity (current or historic) or remote from areas of high vehicular activity.
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(6) | Benzo(a)pyrene | | |
(7) | Boron | Boron is found naturally in groundwater but its presence in surface water is frequently a consequence of the discharge of treated sewage effluent, in which it arises from its use in detergents, to surface water.
| If the monitoring local authority is satisfied that Boron is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(8) | Bromate | | |
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(9) | Cadmium | Cadmium is released into the environment in wastewater. Diffuse pollution is also caused by contamination from fertilizers and local air pollution. Contamination in drinking water may also be caused by impurities in the zinc of galvanised pipes and solders and some metal fittings.
| If the monitoring local authority is satisfied that Cadmium is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(10) | Chromium | | If the monitoring local authority is satisfied that Chromium is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(11) | Copper | Copper concentrations in drinking water vary widely with the primary source most often being the corrosion of interior copper plumbing. Copper concentrations in treated water often increase during distribution, especially in systems with an acid pH or high carbonate waters with an alkaline pH. Consumption of standing or partially flushed water from a distribution system that includes copper pipes or fittings can considerably increase total daily copper exposure, especially for infants fed formula reconstituted with tap water.
| If the monitoring local authority is satisfied that Copper is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(12) | Cyanide | | If the monitoring local authority is satisfied that Cyanide is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(13) | 1,2 dichloroethane | 1,2 dichloroethane is used mainly as an intermediate in the production of vinyl chloride and other chemicals and to a lesser extent as a solvent. It may enter surface waters via effluents from industries that manufacture or use the substance. It may also enter groundwater, where it persists for long periods, following disposal in waste sites.
| If the monitoring local authority is satisfied that 1,2 dichloroethane is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(14) | Epichlorohydrin | Epichlorohydrin is used for the manufacture of glycerol, unmodified epoxy resins and water treatment resins. It is also found in some polyamine flocculants.
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(15) | Fluoride | | If the monitoring local authority is satisfied that Fluoride is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(16) | Iron | | If the monitoring local authority is satisfied that Iron is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(17) | Lead | Lead is rarely present in tap water as a result of its dissolution from natural sources. The presence of lead is primarily from household plumbing systems containing lead in pipes, solder, fittings or the service connections to homes.
| If the monitoring local authority is satisfied that Lead is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(18) | Manganese | Manganese is naturally occurring in many surface and groundwater sources, particularly in anaerobic or low oxidation conditions. Manganese greensands are used in some locations for potable water treatment.
| If the monitoring local authority is satisfied that Manganese is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(19) | Mercury | | |
| | | if electrolytic production of chlorine is not used as part of the treatment process, and if the monitoring local authority is satisfied that mercury is not present at or above 75% of PCV, then an exemption under regulation 26 may be granted, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(20) | Nickel | | If the monitoring local authority is satisfied that Nickel is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(21) | Nitrate | | If the supply is in an area where agricultural fertilisers are used then the supply should be sampled as specified in Schedule 2; if the supply is in an area where agricultural fertilisers are not used, and if the monitoring local authority is satisfied that nitrate is not present at or above 75% of PCV, then an exemption under regulation 26 may be granted, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(22) | Nitrite | | If the monitoring local authority is satisfied that Nitrite is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(24) | Pesticides | See definition of “pesticides and related products” in regulation 2(1). The range of pesticides and related products that may be being used in any one area should be assessed on an individual supply basis.
| If the monitoring local authority is satisfied that Pesticides are not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise they should be sampled for at the frequency specified in Schedule 2.
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(25) | Pesticides – Total | | |
(26) | Polycyclic Aromatic Hydrocarbons (PAH) | | If the monitoring local authority is satisfied that PAH are not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise they should be sampled for at the frequency specified in Schedule 2.
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(27) | Selenium | | If the monitoring local authority is satisfied that Selenium is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(28) | Silver | | If the monitoring local authority is satisfied that Silver is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(29) | Sodium | | If the monitoring local authority is satisfied that Sodium is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(30) | Sulphate | Sulphates occur naturally in numerous minerals and are used commercially but the highest levels found in groundwaters are from natural sources. Sulphates may occur in surface waters that have received industrial discharges.
| If the monitoring local authority is satisfied that Sulphate is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(31) | Tetrachloroethene and Trichloroethene | | If the monitoring local authority is satisfied that Tetrachloroethene and Trichloroethene are not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise they should be sampled for at the frequency specified in Schedule 2.
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(32) | Tetrachloromethane | | If the monitoring local authority is satisfied that Tetrachloromethane is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(33) | Total indicative dose | | If a monitoring local authority is satisfied that on the basis of other monitoring carried out, the Total indicative dose in a supply is well below the prescribed value, the authority may seek a regulation 24 notice from the Scottish Ministers confirming that the supply need not be monitored in respect of Total indicative dose.
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(34) | Trihalomethanes – Total | | |
(35) | Tritium | Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotope Lithium-6 is bombarded to produce Tritium.
| If a monitoring local authority is satisfied that on the basis of other monitoring carried out, the level of Tritium in a supply is well below the prescribed value, the authority may seek a regulation 24 notice from the Scottish Ministers confirming that the supply need not be monitored for Tritium.
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(36) | Vinyl chloride | Vinyl chloride is used primarily for the production of PVC. When unplasticised PVC is in contact with water it is possible for the vinyl chloride monomer to be released into the water. Unplasticised PVC pipes should not be used for drinking water supplies. This is controlled by product specification.
| Unplasticised PVC pipes not present. If the monitoring local authority is satisfied that Vinyl chloride is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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(37) | Zinc | | If the monitoring local authority is satisfied that Zinc is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
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