Standard Values for Microbiological Quality
Parameters Values
Total coliform < 1.1 MPM/ 100ml
Fecal coliform < 1.1 MPM/ 100ml
Heterotrophic Plate Count <500 CFU/ ml
Standard Values for Inorganic Chemical Constituents with Health Significance
Constituent Maximum Level (mg/L)
Antimony 0.02
Arsenic 0.05
Barium 0.7
Boron 0.5
Cadmium 0.003
Chromium (Total) 0.05
Cyanide (Total) 0.07
Fluoride 1
Lead 0.01
Mercury (Total) 0.001
Nickel 0.02
Nitrate 50
Nitrite 3
Selenium 0.01
Organic Chemical Constituents from Industrial Pollution (with health significance)
Constituent Maximum Level (mg/L)
Benzene 0.01
Carbon Tetrachloride 0.004
1,2-Dichlorobenzene 1
1,4-Dichlorobenzene 0.3
1,2-Dichloroethane 0.03
1,1-Dichloroethene 0.03
1,2-Dichloroethene 0.05
Dichloromethane 0.02
Di(2-ethylhexyl) phthalate 0.008
Edetic Acid (EDTA) 0.6
Ethylbenzene 0.3
Nitrilotriacetic acid (NTA) 0.2
Polynuclear aromatic hydrocarbons (PAHs) 0.0007
Styrene 0.02
Tetrachloroethene 0.04
Toluene 0.7
Trichloroethene 0.07
Vinyl chloride 0.0003
Xylene 0.5
Standard Value for Organic Chemical Constituents (Pesticides)
Constituent Maximum Level (µg/L)
Aldrin and Dieldrin (combined) 0.03
Atrazine 2
Carbofuran 7
Chlordane 0.2
DDT 1
1,2-Dibromo-3-chloropropane (DBCP) 1
2,4-Dichlorophenoxyacetic acid (2,4-D) 30
Endrin 0.6
1,2-Dibromoethane (Ethylene dibromide) 0.4
Heptachlor and Heptachlor epoxide (combined) 0.03
Lindane 2
MCPA [4-(2methyl-4-chlorophenoxy)acetic acid] 2
Pendimethalin 20
Pentachlorophenol (PCP) 9
Standard Values for Physical and Chemical Quality for Acceptability Aspects
Constituent Maximum Level (mg/L)
Or Characteristic
Taste No objectionable Taste
Odor No objectionable odor
Color ( Apparent ) 10 Color Units
( True ) 5 Color Units
Turbidity 5 NTU
Aluminum 0.2
Chloride 250
Copper 1
Hardness 300 as CaCO3
Hydrogen sulfide 0.05
Iron 1
Manganese 0.4
pH 6.5 – 8.5
5 – 7
for product water that undergone reverse osmosis or distillation process
Sodium 200
Sulfate 250
Total Dissolved Solids (TDS) 500
<10
for product water that undergone reverse osmosis or distillation process
Zinc 5
Standard Values for Chemicals Used in Treatment and Disinfection and Disinfection by-products
Constituent Maximum Level (mg/L)
a. Contaminants from Treatment Chemicals
Acrylamide 0.0005
Epichlorohydrin 0.0004
b. Disinfection Chemicals
Chlorine Residual 0.3 min
1.5 max
Iodine Not recommended for long term disinfection 
c. Disinfection by-products
Bromate 0.01
Chlorite 0.7
Chlorate 0.7
Chloral hydrate (trichloroacetaldehyde) 0.01
Dibromoacetonitrile 0.07
Dichloroacetic acid 0.05
Dichloroacetonitrile 0.02
Formaldehyde 0.9
Monochloroacetate 0.02
Trichloroacetate 0.2
2,4,6-trichlorophenol 0.2
Trihalomethanes
Bromoform 0.1
Dibromochloro-methane 0.1
Bromodichloro-methane 0.06
Chloroform 0.2

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