Quality Control Standards Quality Control Standards |
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Recommended Raw Water Quality Criteria & Drinking Water Quality Standards and Frequency of Monitoring (2000 Version) |
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RAW WATER |
DRINKING WATER |
Parameter |
Recommended Acceptable Value |
Frequency of Monitoring |
Standard |
Frequency of Monitoring |
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Treatment Plant Outlet |
Service Reservoir Outlet |
Distribution System |
Microbiological: |
Total Coliform |
5000 cfu/100 ml |
W |
MPN Method/Membrane Filtration Method : Must not be detected in any 100 ml sample. |
W |
W |
W |
E. Coli or Thermotolerant Coliform Bacteria |
- |
- |
Absent in 100 ml |
W |
W |
M |
Faecal Striptococci |
- |
- |
Membrane Filter Method : Absent in 100 ml sample MPN Method : <1 in 100 ml sample |
WN |
WN |
WN |
Clostridium |
- |
- |
Absent |
WN |
WN |
WN |
Viruses |
- |
- |
Absent in 100 ml |
WN |
WN |
WN |
Protozoa |
- |
- |
Absent in 100 ml |
WN |
WN |
WN |
Helminths |
- |
- |
Absent in 100 ml |
WN |
WN |
WN |
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PHYSICAL - GROUP I: |
Turbidity (NTU) |
1000 |
W |
5 |
W |
W |
M |
Colour (Hazen) |
300 |
W |
15 |
W |
W |
M |
pH (H ion) |
5.5-9.0 |
W |
6.5 - 9.0 |
W |
W |
M |
Free Residual Chlorine |
- |
- |
not less than 0.2 |
W |
W |
M |
Combine Residual Chlorine |
- |
- |
not less than 1.0 |
W |
W |
M |
Monochloramine |
- |
- |
3 |
WN |
WN |
WN |
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INORGANIC - GROUP II: |
TDS at 105 - 110 C |
1500 |
M |
1000 |
M |
M |
Y/2 |
Biochemical Oxygen Demand |
6 |
M |
- |
- |
- |
- |
Chemical Oxygen Demand |
10 |
M |
- |
- |
- |
- |
Chloride |
250 |
M |
2.50 |
M |
M |
Y/2 |
Anionic Detergent MBAS |
1 |
M |
1 |
M |
M |
Y/2 |
Ammonia (N) |
1.5 |
M |
1.5 |
M |
M |
Y/2 |
Nitrate (N) |
10 |
M |
10 |
M |
M |
Y/2 |
Total Nitrogen (N) |
1.0 |
M |
- |
- |
- |
- |
Iron (Fe) |
1.0 |
M |
0.3 |
M |
M |
Y/2 |
Fluoride (F) |
1.5 |
M |
0.4 - 0.6 |
M |
M |
Y/2 |
Hardness |
500 |
M |
500 |
M |
M |
Y/2 |
Aluminium (Al) |
- |
M |
0.2 |
M |
M |
Y/2 |
Manganese (Mn) |
0.2 |
Y/4 |
0.1 |
M |
M |
Y/2 |
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