Unichem Water Engineering Co.

Standards

Sl.No.	PARAMETERS	UNITS	DRINKING WATER IS: 10500-1991
Sl.No.	PARAMETERS	UNITS	DESIRABLE	MAXIMUM
1.	Colour	Hazen units	5	25
2.	Odour	-	Unobjectionable	-
3.	Taste	-	Agreeable	-
4.	Turbidity	NTU	5	10
5.	pH value	-	6.5 to 8.5	No relaxation
6.	Total hardness ( as CaCO3 )	mg/l	300	600
7.	Iron	mg/l	0.3	1.0
8.	Chloride	mg/l	250	1000
9.	Residual, free chlorine	mg/l	0.2	-
10.	Dissolved solids	mg/l	500	2000
11.	Calcium	mg/l	75	200
12.	Copper	mg/l	0.05	1.5
13.	Manganese	mg/l	0.1	0.3
14.	Sulphate	mg/l	200	400
15.	Nitrate	mg/l	50	No relaxation
16.	Fluoride	mg/l	1.0	1.5
17.	Phenolic compounds	mg/l	0.001	0.002
18.	Mercury	mg/l	0.001	No relaxation
19.	Cadmium	mg/l	0.01	No relaxation
20.	Selenium	mg/l	0.01	No relaxation
21.	Arsenic	mg/l	0.05	No relaxation
22.	Cyanide	mg/l	0.05	No relaxation
23.	Lead	mg/l	0.05	No relaxation
24.	Zinc	mg/l	5	15
25.	Anionic detergent	mg/l	0.2	1.0
26.	Chromium	mg/l	0.05	-
27.	Polynuclear Aromatic Hydrocarbon	mg/l	-	-
28.	Mineral oil	mg/l	0.01	0.03
29.	Pesticides	mg/l	Absent	0.001
30.	Radioactive materials Alpha emitters Beta emitters	Bq/l Pci/l	- -	0.1 0.037
31.	Alkalinity	mg/l	200	600
32.	Aluminium	mg/l	0.03	0.02
33.	Boron	mg/l	1	5