ItemConcentration or Value (maximum) or State

Units of Measurement

Point of monitoring

1.

Ammonium

0.50

mgNH₄/l

consumers’ taps

2.

Chloride (i)

250

mgCl/l

consumers’ taps*

3.

Clostridium perfringens (including spores)

0

Number/100 ml

consumers’ taps*

4.

Coliform bacteria

0

Number/100ml

consumers’ taps

[Number/1 ml at 37° C]

service reservoirs and treatment works

6.

Conductivity (i)

2500

m S/cm at 20° C

consumers’ taps*

7.

Sulphate (i)

250

mgSO₄/l

consumers’ taps*

8.

Total indicative dose (for radioactivity) (ii)

0.10

mSv/year

consumers’ taps*

9.

Total organic carbon (TOC)

No abnormal change

mgC/l

consumers’ taps*

10.

Tritium (for radioactivity)

100

Bq/l

consumers’ taps*

11.

Turbidity

1

NTU

treatment works