Part II Prescribed concentrations or values

Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below:

TABLE A

Column 1	Column 2	Column 3	Column 4
{s001} Note(i) If silver is used in a water treatment process, 80 may be substituted for 10.
Item	Parameters	Units of Measurement	Concentration or Value (maximum unless otherwise stated)
1.	Colour	mg/l Pt/Co scale	20
2.	Turbidity (including suspended solids)	Formazin turbidity units	4
3.	Odour (including hydrogen sulphide)	Dilution number	3 at 25°C
4.	Taste	Dilution number	3 at 25°C
5.	Temperature	°C	25
6.	Sulphate	Mg SO₄/l	250
7.	Magnesium	Mg Mg/l	50
8.	Sodium	Mg Na/l	150
9.	Potassium	Mg K/l	12
10.	Dry residues	Mg/l	1500 (after drying at 180°C)
11.	Nitrate	Mg NO₃/l	50
12.	Nitrite	Mg NO₂/l	0.1
13.	Ammonium (ammonia and ammonium ions)	Mg NH₄/l	0.5
14.	Kjeldahl nitrogen	Mg N/l	1
15.	Oxidizability (permanganate value)	Mg O₂/l	5
16.	Total organic carbon	Mg C/l	No significant increase over that normally observed
17.	Dissolved or emulsified hydrocarbons (after extraction with petroleum ether); mineral oils	μg/l	10
18.	Phenols	μg C₆H₅OH/l	0.5
19.	Surfactants	μg/l (as lauryl sulphate)	200
20.	Aluminium	μg A1/l	200
21.	Iron	μg Fe/l	200
22.	Manganese	μg Mn/l	50
23.	Copper	μg Cu/l	3000
24.	Zinc	μg Zn/l	5000
25.	Phosphorus	μg P/l	2200
26.	Fluoride	μg F/l	1500
27.	Silver	μg Ag/l	10 {s001}(i)

TABLE B

Column 1	Column 2	Column 3	Column 4
{s002}(i) The sum of the detected concentrations of individual substances. {s003}(ii) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3–cd) pyrene.
Item	Parameters	Units of Measurement	Maximum Concentration
1.	Arsenic	μg As/l	50
2.	Cadmium	μg Cd/l	5
3.	Cyanide	μg CN/l	50
4.	Chromium	μg Cr/l	50
5.	Mercury	μg Hg/l	1
6.	Nickel	μg Ni/l	50
7.	Selenium	μg Se/l	10
8.	Antimony	μg Sb/l	10
9.	Lead	μg Pb/l	10
10.	Pesticides and related products: (a)individual substances	μg/l	0.1
	(b)total substances {s002}(i)	μg/l	0.5
11.	Polycyclic aromatic Hydrocarbons {s003}(ii)	μg/l	0.2

TABLE D

Column 1	Column 2	Column 3	Column 4
Item	Parameters	Units of Measurement	Maximum Concentration or Value
1.	Conductivity	μS/cm	1500 at 20°C
2.	Chloride	mg Cl/l	400
3.	Calcium	mg Ca/l	250
4.	Substances extractable in chloroform	mg/l dry residue	1
5.	Boron	μg B/l	2000
6.	Barium	μg Ba/l	1000
7.	Benzo 3.4 pyrene	ng/l	10
8.	Tetrachloromethane	μg/l	3
9.	Trichloroethene	μg/l	30
10.	Tetrachloroethene	μg/l	10