Indian Standard Specifications for Drinking Water

National Ambient Air Quality Standards

Ambient Air Quality Standards in Respect to Noise

Indian Standard Specifications for Drinking Water : 10500 - 1983.

Sl. No.

Characteristics

Requirement Desirable Limit

Undesirable Effect Outside the Desirable Limit

Desirable/
Essential

Remarks

1.

Colour, Hazen Units, Max.

--

Above 10

Essential

May be extended to 50 only if toxic substances are not suspected in absence of alternative sources.

2.

Odour

Objectionable

--

Essential

a)Test cold and when heated.
b)Test at severaldilutions.

3.

Taste

Agreeable

--

Essential

Test to be conducted only after safety has been established.

4.

Turbidity, NTU, Max.

10

Above 10, Consumer acceptance decreases.

Essential

May be extended upto 25, in absence of alternative sources.

5.

pH Value

6.5 to 8.5

Beyond this range the water will affect the mucous membrane and/or water supply system.

Essential

May be relaxed upto 9.2 in absence of alternative sources.

6.

Total Hardness (as CaCO3) mg/l Max.

300

Encrustation in water supply structure and adverse effects on domestic use.

Essential

May be extended upto 600 in the absence of other sources.

7.

Calcium (as Ca), mg/l, Max.

75

Encrustation in water supply structure and adverse effects on domestic use.

Desirable

May be extended upto 200, in the absence of other sources.

8.

Magnesium (as Mg), mg/l, Max.

30

Encrustation in water supply structure and adverse effects on domestic use.

Desirable

May be extended upto 100, in the absence of other sources.

9.

Copper (as Cu), mg/l, Max.

0.05

Astringent taste, dis-colouration and corrosion of pipes fittings and utensils will be caused beyond this.

Desirable

May be relaxed upto 1.5.

10.

Iron (as Fe), mg/l, Max.

0.3

Beyond this limit taste/appearance are affected & has adverse effect on domestic uses and water structures, and promotes iron bacteria

Essential

May be extended upto 1.0 in absence of alternative sources.

11.

Manganese (as Mn), mg/l, Max.

0.1

Beyond this limit, taste/appearance are affected on domestic uses and water supply structure.

Desirable

May be extended up to 0.5 where alternate source is not available.

12.

Sulphate (as SO4), mg/l, Max.

250

Beyond this causes gastrointestinal irrigation when magnesium of sodium are present .

Essential

May be extended up to 400 provided magnesium (as Mg) does not exceed 30.

13.

Chloride (as Cl), mg/l, Max.

250

Beyond this limit, taste, corrosion and palatability are affected

Essential

May be extended up to 1000 in the absence of other alternate sources.

14.

Nitrate (as NO3)mg/l, Max.

45

Beyond this mathemoglobinaemia takes place.

Desirable

No relaxation

15.

Fluoride (as F), mg/l

0.6 to 1.2

Low floride level are linked with dental carries above 1.5 it may cause fluorosis.

Desirable

If the limit is below 0.6 water source should be rejected but suitable public health measures should be taken. Maximum limit may be extended to 1.5 if no better alternate source is available.

16.

Phenolic Compounds (as C6H5OH), mg/l, Max.

0.001

Beyond this it may cause objectionable taste and odour.

Desirable

May be relaxed up to 0.002.

17.

Mercury (as Hg) mg/L, Max.

0.001

Beyond this the water becomes toxic.

Desirable

No relaxation of this limit is allowed to be tested when pollution is suspected.

18.

Cadmium (as Cd), mg/l, Max.

0.01

Beyond this the water becomes toxic.

Desirable

No relaxation of this limit is allowed to be tested when pollution is suspected.

19.

Selenium (as Se) mg/l, Max.

0.01

Beyond this the water becomes toxic.

Desirable

No relaxation of this limit is allowed to be tested when pollution is suspected.

20.

Arsenic (as as) mg/l, Max.

0.05

Beyond this the water becomes toxic.

Desirable

No relaxation of this limit is allowed to be tested when pollution is suspected

21.

Cyanide (as Cn) mg/l, Max.

0.05

Beyond this the water becomes toxic.

Desirable

No relaxation of this limit is allowed to be tested when pollution is suspected

22.

Lead (as Pb), mg/l, Max.

0.1

Beyond this the water becomes toxic.

Desirable

No relaxation of this limit is allowed to be tested when pollution is suspected

23.

Zinc (as Zn), mg/l, Max.

5.0

Beyond this limit it can cause astringent taste and an opalescence in water.

Desirable

May be relaxed up to 10.0. To be tested when pollution is suspected.

24.

Anionic detergents (as MBAS), mg/l, Max.

0.2

Beyond this limit it can cause a light froth in water.

Desirable

May be relaxed up to 1.0. To be tested when pollution is suspected.

25.

Chromium (as Cr+6) mg/l, Max.

0.05

May be carcinogenic.

Desirable

--

26.

Mineral Oil, mg/l, Max.

0.01

Beyond this limit undesirable taste and odour after chlorination takes place.

Desirable

May be relaxed up to 0.03. To be tested when pollution is suspected

27.

Residual free chlorine mg/l, Max.

0.2

--

Essential

To be applicable only when water is chlorinated. Tested at consumer end. When protection against viral infection is required, it should be min. 0.5 mg/L.

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National Ambient Air Quality Standards

 

Pollutants
Time weighted average
Concentration in ambient air
Industrial Area
Residential, Rural & other Areas
Sensitive Area
1
2
3
4
5
Sulphur Dioxide
Annual Average
80 mg/m3
60 mg/m3
15 mg/m3
24 hours
120 mg/m3
80 mg/m3
30 mg/m3
Oxides of Nitrogen as NO2
Annual Average
80 mg/m3
60 mg/m3
15 mg/m3
24 hours
120 mg/m3
80 mg/m3
30 mg/m3
 
SuspendedParticulate Matter (SPM)
Annual Average
360 mg/m3
140 mg/m3
70 mg/m3
24 hours
500 mg/m3
200 mg/m3
100 mg/m3
 
Lead
Annual Average
1.0 mg/m3
0.75 mg/m3
0.50 mg/m3
24 hours
1.5 mg/m3
1.0 mg/m3
0.75 mg/m3
 
Carbon Monoxides
Annual Average
5.0 mg/m3
2.0 mg/m3
1.0 mg/m3
24 hours
5.0 mg/m3
2.0 mg/m3
1.0 mg/m3

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Ambient Air Quality Standards in Respect to Noise

 

ZONE CODE
ZONE
LIMITS IN dB(A)
DAY TIME
(6 AM TO 9 PM)
NIGHT TIME
(9 PM TO 6 AM)
(A)
Industrial
75
70
(B)
Commercial
65
55
(C)
Residential
55
45
(D)
Silence
50
40

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