Schedule 1 PRESCRIBED CONCENTRATIONS OR VALUES

Table A

Item	Parameters	Units of measurement	Concentration or Value (maximum unless otherwise stated)
Note: (i) if silver is used in water treatment process, 80 may be substituted for 10.
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.	Hydrogen ion	pH value	9.5, 5.5 (minimum)
7.	Sulphate	mg SO₄/l	250
8.	Magnesium	mg Mg/l	50
9.	Sodium	mg Na/l	150
10.	Potassium	mg K/l	12
11.	Dry residues	mg/l	1500 (after drying at 180°C)
12.	Nitrate	mg NO₃/l	50
13.	Nitrite	mg NO₂/l	0.1
14.	Ammonium (ammonia and ammonium ions)	mg NH₄/l	0.5
15.	Kjeldahl nitrogen	mg N/l	1
16.	Oxidizability (permanganate value)	mg O₂/l	5
17.	Total organic carbon	mg C/l	No significant increase over that normally observed
18.	Dissolved or emulsified hydrocarbons (after extraction with petroleum ether); mineral oils	μg/l	10
19.	Phenols	μg C₆H₅OH/l	0.5
20.	Surfactants	μg/l (as lauryl sulphate)	200
21.	Aluminum	μgAl/l	200
22.	Iron	μgFe/l	200
23.	Manganese	μg/Mn/l	50
24.	Copper	μg Cu/l	3000
25.	Zinc	μg Zn/l	5000
26.	Phosphorus	μg P/l	2200
27.	Fluoride	μg F/l	1500
28.	Silver	μg Ag/l	10(i)

Table B

Item	Parameters	Units of measurement	Maximum Concentration
Notes: (i) The sum of the detected concentrations of individual substances. (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.
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.	Lead	μg/ Pb/l	50
8.	Antimony	μg Sb/l	10
9.	Selenium	μg Se/l	10
10.	Pesticides and related products:
	(a) individual substances	μg/l	0.1
	(b) total substances (i)	μg/l	0.5
11.	Polycyclic aromatic hydrocarbons (ii)	μg/l	0.2

Table C

Item	Parameters	Units of measurement	Maximum Concentration
Note: (i) Analysis by multiple tube method.
1.	Total coliforms	number/100 ml	0
2.	Faecal coliforms	number/100 ml	0
3.	Faecal streptococci	number/100 ml	0
4.	Sulphite-reducing clostridia	number/20 ml	≤1(i)
5.	Colony counts	number/1 ml at 22°C or 37°C	No significant increase over that normally observed

Table D(i)

Item	Parameters	Units of measurement	Concentration or Value
Note: (i) See regulation 3(3)(d).
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	μg/l	10
8.	Tetrachloromethane	μg/l	3
9.	Trichloroethene	μg/l	30
10.	Tetrachloroethene	μg/l	10

Table E

Item	Parameters	Units of measurement	Minimum Concentration(i)
Note: (i) See regulation 3(4).
1.	Total hardness	mg Ca/l	60
2.	Alkalinity	mg HCO₃/l	30