Schedule 2 INDICATOR PARAMETERS

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

Item	Parameters	Specification Concentration or Value (maximum) or State	Units of Measurement	Point of monitoring
Notes: (i) The water should not be aggressive.
(ii) Excluding tritium, potassium−40, radon and radon decay products.
* May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.
1.	Ammonium	0.50	mgNH4/l	Consumers' taps
2.	Chloride ^f1	250	mgCl/l	Supply point^f2
3.	Clostridium perfringens (including spores)	0	Number/100ml	Supply point
4.	Coliform bacteria	0	Number/100ml	Consumers' taps
5.	Colony counts	No abnormal change	Number/1ml at 22°C	Consumers' taps, service reservoirs and treatment works
5.	Colony counts	No abnormal change	Number/1ml at 37°C	Consumers' taps, service reservoirs and treatment works
6.	Conductivity	2500	μS/cm at 20°C	Supply point
7.	Sulphate	250	mgSO₄/l	Supply point
8.	Total indicative dose (for radioactivity) ^f3	0.10	mSv/year	Supply point
9.	Total organic carbon (TOC)	No abnormal change	mgC/l	Supply point
10.	Tritium (for radioactivity)	100	Bq/l	Supply point
11.	Turbidity	1	NTU	Treatment works

Annotations

f1

(i)

The water should not be aggressive.

f2

May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.

f3

(ii)

Excluding tritium, potassium−40, radon and radon decay products.