SCHEDULE 2PRESCRIBED CONCENTRATIONS OR VALUES

Regulation 2(1)

Table A

Item

Parameters

Units of Measurement

Concentration or Value (maximum unless otherwise stated)

1.

Colour

mg/1 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 SO4/1

250

8.

Magnesium

mg Mg/1

50

9.

Sodium

mg Na/1

150

10.

Potassium

mg K/1

12

11.

Dry residues

mg/1

1500 (after drying at 180°C)

12.

Nitrate

mg NO3/1

50

13.

Nitrite

mg NO2/1

0.1

14.

Ammonium (ammonia and ammonium ions)

mg NH4/1

0.5

15.

Kjeldahl nitrogen

mg N/1

1

16.

Oxidisability (permanganate value)

mg O2/1

5

17.

Total organic carbon

mg C/1

No significant increase over that normally observed

18.

Dissolved or emulsified hydrocarbons (after extraction with petroleum ether); mineral oils

μg/1

10

19.

Phenols

μg C6H5OH/1

0.5

20.

Surfactants

μg/1 (as lauryl sulphate)

200

21.

Aluminium

μg Al/1

200

22.

Iron

μg Fe/1

200

23.

Manganese

μg Mn/1

50

24.

Copper

μg Cu/1

3000

25.

Zinc

μg Zn/1

5000

26.

Phosphorus

μg P/1

2200

27.

Fluoride

μg F/1

1500

28.

Silver

μg Ag/1

10(i)

Note: (i) If silver is used in a water treatment process, 80 may be substituted for 10.

Table B

Item

Parameters

Units of Measurement

Maximum Concentration

1.

Arsenic

μg As/1

50

2.

Cadmium

μg Cd/1

5

3.

Cyanide

μg CN/1

50

4.

Chromium

μg Cr/1

50

5.

Mercury

μg Hg/1

1

6.

Nickel

μg Ni/1

50

7.

Lead

μg Pb/1

50

8.

Antimony

μg Sb/1

10

9.

Selenium

μg Se/1

10

10.

Pesticides and related products:

  1. a

    individual substances

μg/1

0.1

b

total substances(i)

μg/1

0.5

11.

Polycyclic aromatic hydrocarbons(ii)

μg/1

0.2

Note:

  1. i

    The sum of the detected concentrations of individual substances.

  2. 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.

Table C

Item

Parameters

Units of Measurement

Maximum Concentration

1.

Total coliforms

number/100 ml

0

2.

Faccal coliforms

number/100 ml

0

3.

Faccal 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

Note: (i) Analysis by multiple tube method.

Table D(i)

Item

Parameters

Units of Measurement

Maximum Concentration or Value

1.

Conductivity

μS/cm

1500 at 20°C

2.

Chloride

mg Cl/1

400

3.

Calcium

mg Ca/1

250

4.

Substances extractable in chloroform

mg/1 dry residue

1

5.

Boron

μg B/1

2000

6.

Barium

μg Ba/1

1000

7.

Benzo 3,4 pyrene

μg/1

10

8.

Tetrachloromethane

μg/1

3

9.

Trichloroethene

μg/1

30

10.

Tetrachlorothene

μg/1

10

Note: (i) See regulation 3(3)(d).

Table E

Item

Parameters

Units of Measurement

Minimum Concentration(i)

1.

Total hardness

mg Ca/1

60

2.

Alkalinity

mg HCO3/1

30

Note: (i) See regulation 3(4).