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General and Special Limits

Table 2.1 (Government Gazette 36820, September 2013)

SUBSTANCE/PARAMETER

UNITS

GENERAL LIMIT

SPECIAL LIMIT

Faecal Coliforms 

per 100ml

1,000

0

COD

mg/l

75

25

pH

5.5 - 9.5

5.5 - 7.5

Ammonia

mg/l

6

2

Nitrates

mg/l

15

1.5

Chlorine (free)

mg/l

0.25

0

Suspended Solids

mg/l

25

10

Electrical conductivity

mS/m

150

100

Ortho - phosphate

mg/l

10

1

Soap, oil or grease

mg/l

2.5

0

Notes

  1. COD of filtered water
  2. Conductivity
    1. General is 70mS/m above intake to a maximum of 150 mS/m
    2. Special is 50mS/m above intake to a maximum of 100 mS/m
  3. Not all parameters are listed in the Table above