TREATED
WATER QUALITY USP Standards:
Sr. No.
|
PARAMETER
|
Water as per
U S P Standards
Purified water
|
|
1.
|
Appearance
|
Clear
|
|
2.
|
Colour,
Hazen unit
|
Colourless
|
|
3.
|
Odour
|
Odourless
|
|
4.
|
pH
|
5.0
- 7.0
|
|
5.
|
Conductivity @ 25 o C
|
<
1.25 mS/cm.
|
|
6.
|
Total Organic Carbon, ppb
|
<500
ppb
|
|
7.
|
Total aerobic microbial count, (cfu/ml)
|
As per USP 27 : 100
Target level :
100
|
INDIAN STANDARDS
DRINKING WATER SPECIFICATIONS
|
Sl. No.
|
Particulars
|
Desirable Limit
|
Permissible Limitin the Absence of Alternate Sources
|
|
|
Essential Characteristics |
|
|
|
1
|
Colour , Pt-Co
|
5
|
25
|
|
2
|
Odour
|
Unobjectionable
|
--
|
|
3
|
Taste
|
Agreeable
|
--
|
|
4
|
Turbidity, NTU
|
5
|
10
|
|
5
|
pH Value
|
6.5 – 8.5
|
No relaxation
|
|
6
|
Total Hardness (as CaCo3) mg/l
|
300
|
600
|
|
7
|
Iron (as Fe), mg/l
|
0.3
|
1.0
|
|
8
|
Chlorides ( as Cl), mg/l
|
250
|
1000
|
|
9
|
Residual free chlorine
|
0.20
|
--
|
|
|
|
|
|
|
|
Desirable Characteristics |
|
|
|
10
|
Dissolved solids, mg/l
|
500
|
2000
|
|
11
|
Sulphates (as SO4 ), mg/l
|
200
|
400
|
|
12
|
Nitrate(as NO3), mg/l
|
45
|
100
|
|
|
|
|
|
|
GENERAL STANDARD FOR BACTERIOLOGY
|
|||
|
1.
|
Total Plate Count / ml
|
100
|
|
|
2.
|
MPN Coliform / 100ml
|
1
|
|
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