(AMENDMENT NO.1 JANUARY 1993)
TO
INDIAN STANDARDS: DRINKING WATER – SPECIFICATIONS (FIRST REVISION)
IS 10500 : 1991
S.No. | Substance or Characteristic | Requirement (Desirable Limit) | Undesirable effect – outside the desirable limit | Permissible limit in the absence of alternate source | Methods of test (Ref. to IS) | Remarks |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
Essential characteristics: | ||||||
1. | Colour, Hazen units, Max. | 5 | Above 5 consumer acceptance decreases | 25 | 3025 (Part 4) 1983 | Extended to 25 only if toxic substances are not suspected in the absence of alternate source |
2. | Odour | Unobjectionable | -- | -- | 3025 (Part 5) 1983 | a. Test cold and when heated. b. Test at several dilutions. |
3. | Taste | Agreeable | -- | -- | 3025 (Part 7 & 8) 1984 | Test to be conducted only after safety has been established. |
4. | Turbidity, NTU, Max. | 5 | Above 5 consumer acceptance decreases | 10 | 3025 (Part 10) 1984 | -- |
5. | PH value | 6.5– 8.5 | Beyond this range the water will affect the mucous membrane and / or water supply system | No relaxation | 3025 (Part 11) 1984 | -- |
6. | Total Hardness (as CaCO3) mg/L, Max. | 300 | Encrustation in water supply structure and adverse effects on domestic use. | 600 | 3025 (Part 21) 1983 | -- |
7. | Iron as Fe, mg/L, Max. | 0.3 | Beyond this limit taste / appearance are affected, has adverse effect on domestic uses and water supply structures and promotes iron bacteria | 1 | 32 of 3025, 1964 | -- |
8. | Chlorides as Cl-, mg/L, Max. | 250 | Beyond this limit, taste, corrosion and palatability are affected | 1000 | 3025 (Part 32) 1988 | -- |
S.No. | Substance or Characteristic | Requirement (Desirable Limit) | Undesirable effect – outside the desirable limit | Permissible limit in the absence of alternate source | Methods of test (Ref. to IS) | Remarks |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
9. | Residual free chlorine, mg/L | 0.2 | -- | -- | 3025 (Part 26) 1986 | To be applicable only when water is chlorinated. Tested at consumer end. When protection against viral infection required, it should be minimum 0.5mg/L |
10. | Fluoride as F-, mg/L, Max. | 1.0 | Fluoride may be kept as low as possible. High fluoride may cause fluorosis. | 1.5 | 23 of 3025 1964 | -- |
Desirable characteristics: | ||||||
11. | Dissolved solids, mg/L, Max. | 500 | Beyond this palatability decreases and may cause gastro intestinal irritation | 2000 | 3025 (Part 16) 1984 | -- |
12. | Calcium as Ca+2, mg/L, Max. | 75 | Encrustation in water supply structure and adverse effect on domestic use | 200 | 3025 (Part 40) 1991 | -- |
13. | Magnesium as Mg+2, mg/L, Max. | 30 | Encrustation in water supply structure and adverse effect on domestic use | 100 | 16, 33, 34 of IS 3025: 1964 | -- |
14. | Copper as Cu, mg/L, Max. | 0.05 | Astringent taste, discolouration and corrosion of pipes fitting and utensils will be caused beyond this | 1.5 | 36 of 3025: 1964 | -- |
15. | Manganese as Mn, mg/L, Max. | 0.1 | Beyond this limit taste / appearance are affected, has adverse effect on domestic uses and water supply structures and promotes iron bacteria | 0.3 | 35 of 3025: 1964 | -- |
S.No. | Substance or Characteristic | Requirement (Desirable Limit) | Undesirable effect – outside the desirable limit | Permissible limit in the absence of alternate source | Methods of test (Ref. to IS) | Remarks |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
16. | Sulphate as SO4-2 mg/L, Max. | 200 | Beyond this causes gastro intestinal irritation when magnesium or sodium are present | 400 (see Col.7) | 3025 (Part 24) 1986 | May be extended upto 400 provided Magnesium as Mg+2 does not exceed 30 |
17. | Nitrate as NO3- mg/L, Max. | 45 | Beyond this methaemoglobinemia takes place | 100 | 3025 (Part 34) 1988 | -- |
18. | Phenolic compounds as C6H5OH, mg/L, Max. | 0.001 | Beyond this, it may cause objectionable taste and odour | 0.002 | 54 of 3025, 1964 | -- |
19. | Mercury as Hg, mg/L, Max. | 0.001 | Beyond this, the water becomes toxic | No relaxation | (see note) Mercury ion analyzer | To be tested when pollution is suspected |
20. | Cadmium as Cd, mg/L, Max. | 0.01 | Beyond this, the water becomes toxic | No relaxation | (See note) | To be tested when pollution is suspected |
21. | Selenium as Se, mg/L, Max. | 0.01 | Beyond this, the water becomes toxic | No relaxation | 28 of 3025: 1964 | To be tested when pollution is suspected |
22. | Arsenic as As, mg/L, Max. | 0.05 | Beyond this, the water becomes toxic | No relaxation | 3025 (Part 37): 1988 | To be tested when pollution is suspected. |
23. | Cyanide as CN, mg/L, Max. | 0.05 | Beyond this limit, the water becomes toxic | No relaxation | 3025 (Part 27): 1986 | To be tested when pollution is suspected. |
24. | Lead as Pb, mg/L, Max. | 0.05 | Beyond this limit, the water becomes toxic | No relaxation | (See note) | To be tested when pollution is suspected. |
25. | Zinc as Zn, mg/L, Max. | 5 | Beyond this limit it can cause astringent taste and an opalescence in water | 15 | 39 of 3025: 1964 | To be tested when pollution is suspected. |
26. | Anionic detergents as MBAS, mg/L, Max. | 0.2 | Beyond this limit it can cause a light froth in water | 1.0 | Methyleneblue extraction method | To be tested when pollution is suspected. |
27. | Chromium as Cr6+, mg/L, Max. | 0.05 | May be carcinogenic above this limit | No relaxation | 38 of 3025: 1964 | To be tested when pollution is suspected. |
S.No. | Substance or Characteristic | Requirement (Desirable Limit) | Undesirable effect – outside the desirable limit | Permissible limit in the absence of alternate source | Methods of test (Ref. to IS) | Remarks |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
28. | Polynuclear aromatic hydrocarbons as PAH, mg/L, Max. | -- | May be carcinogenic | -- | -- | -- |
29. | Mineral oil, mg/L, Max. | 0.01 | Beyond this limit undesirable taste and odor after chlorination take place | 0.03 | Gas chromatographic method | To be tested when pollution is suspected. |
30. | Pesticides, mg/L, Max. | Absent | Toxic | 0.001 | -- | -- |
31. | Radioactive materials a. Alpha emitters Bq/L, Max. b. Beta emitters pci/L, Max. | -- -- | -- -- | 0.1 1 | 58 of 3025: 1964 | -- |
32. | Alkalinity, mg/L, Max. | 200 | Beyond this limit taste becomes unpleasant | 600 | 13 of 3025: 1964 | -- |
33. | Aluminium as Al mg/L, Max. | 0.03 | Cumulative effect is reported to cause dementia | 0.2 | 31 of 3025: 1964 | -- |
34. | Boron as B, mg/L, Max. | 1 | -- | 5 | 29 of 3025: 1964 | -- |
Note: Atomic Absorption Spectrophotometric method may be used.
Water quality criteria for different uses
(specified by CPCB, 1979 and the Bureau of Indian Standards, 1982)
S.No | Water quality parameter | Characteristic of water body | ||||
A * | B * | C * | D * | E * | ||
1 | Dissolved Oxygen (DO) mg/l (minimum) | 6 | 5 | 4 | 4 | 3 |
2 | Biochemical Oxygen Demand (BOD), mg/l (max) | 2 | 3 | 3 | - | - |
3 | Total Coliform organisms ** MPN/100ml (max) | 50 ** | 500 | 500 | - | - |
4 | Total Dissolved Solids (TDS) mg/l (max) | 500 | - | 1500 | - | 2100 |
5 | Chlorides (as Cl-) mg/l (max) | 250 | - | 600 | - | 600 |
6 | Colour, Hazen units (max) | - | 10 | 300 | 300 | - |
7 | Sodium Absorption Ratio (max) | - | - | - | - | 20 |
8 | Boron (as B), mg/l (max) | - | - | - | - | - |
9 | Sulphates (as SO4-2), mg/l (max) | 400 | - | 400 | - | 1000 |
10 | Nitrates (as NO3-) mg/l (max) | 20 | - | 50 | - | - |
11 | Free Ammonia (as NH3) mg/l (max) | - | - | - | 1.2 | - |
12 | Conductivity at 25oC micro mhos/cm (max) | - | - | - | 1000 | 2500 |
13 | pH value | 6.5-8.5 | 6.5-8.5 | 6.5-8.5 | 6.5-8.5 | 6.0-8.5 |
14 | Arsenic (as As), mg/l (max) | 0.05 | 0.2 | 0.2 | - | - |
15 | Iron (as Fe), mg/l (max) | 0.3 | - | - | 0.5 | - |
16 | Fluoride (as F), mg/l (max) | 1.5 | 1.5 | 1.5 | - | - |
17 | Lead (as Pb), mg/l (max) | 0.1 | - | 0.1 | - | - |
Note: * Classes of Water use:
A Drinking water source without conventional treatment but after disinfection
B Out door bathing (organised)
C Drinking water source with conventional treatment followed by disinfection.
D Propagation of wild life, fisheries.
E Irrigation, industrial cooling, controlled waste disposal.
** If the coliform is found to be more than the prescribed tolerance limits, the criteria for coliforms shall be satisfied if not more than 20 percent of samples show more than the tolerance limits specified and not more than 5 percent of samples show values more than 4 times the tolerance limits. There should be no visible discharge of domestic and industrial waste into class “A” waters. In case of classes “B” and “C” the discharge shall be so regulated / treated as to ensure maintenance of the stream standards.
AMBIENT AIR QUALITY STANDARDS (NATIONAL)
Pollutants | Time weighted average | Concentration in ambient air | Method of measurement | ||
Industrial areas | Residential Rural & other areas | Sensitive areas | |||
Sulphur Dioxide (SO2) | Annual average* 24 hours** | 80 mg/m3 120 mg/m3 | 60 mg/m3 80 mg/m3 | 15 mg/m3 30 mg/m3 | Improved West and Geake method Ultraviolet fluorescence |
Oxides of Nitrogen as NO2 | Annual average* 24 hours** | 80 mg/m3 120 mg/m3 | 60 mg/m3 80 mg/m3 | 15 mg/m3 30 mg/m3 | Jacob & Hochheiser Modified (Na-Arsenite) method Gas phase chemiluminescence |
Suspended Particulate Matter (SPM) | Annual average* 24 hours** | 360 mg/m3 500 mg/m3 | 140 mg/m3 200 mg/m3 | 70 mg/m3 100 mg/m3 | High volume sampling, (Average flow rate not less than 1.1 m3/minute) |
Respirable Particulate Matter (RPM) (size less than 10 microns) | Annual average* 24 hours** | 120 mg/m3 150 mg/m3 | 60 mg/m3 100 mg/m3 | 50 mg/m3 75 mg/m3 | Respirable particulate matter sampler |
Lead (Pb) | Annual average* 24 hours** | 1.0 mg/m3 1.5 mg/m3 | 0.75 mg/m3 1.0 mg/m3 | 0.5 mg/m3 0.75 mg/m3 | ASS method after sampling using EPM 2000 or equivalent filter paper |
Ammonia | Annual average* 24 hours** | 0.1 mg/m3 0.4 mg/m3 | 0.1 mg/m3 0.4 mg/m3 | 0.1 mg/m3 0.4 mg/m3 | |
Carbon Monoxide (CO) | 8 hours** 1 hour | 5.0 mg/m3 10.0 mg/m3 | 2.0 mg/m3 4.0 mg/m3 | 1.0 mg/m3 2.0 mg/m3 | Non Dispersive Infra RED (NDIR) Spectroscopy |
* Annual arithmetic mean of minimum 104 measurements in a year taken twice a week 24 hourly at uniform interval.
** 24 hourly/8 hourly values should be met 98% of the time in a year. However, 2% of the time, it may exceed but not on two consecutive days.
Note:
1. National Ambient Air Quality Standard: The levels of air quality with an adequate margin of safety, to protect the public health, vegetation and property.
2. Whenever and wherever two consecutive values exceeds the limit specified above for the respective category, it would be considered adequate reason to institute regular / continuous monitoring and further investigations.
3. The standards for H2S and CS2 have been notified separately vide GSR No. 7, dated December 22nd 1998 under Rayon industry – for details please see Sl No. 65 of this document.
ANDHRA PRADESH POLLUTION CONTROL BOARD
A3, I.E.Sanathnagar, Hyderabad - 500018
NOISE (AMBIENT STANDARDS)
Area code | Category of area | Limit in dB (A) Leq | |
Day time | Night time | ||
A | Industrial area | 75 | 70 |
B | Commercial area | 65 | 55 |
C | Residential area | 55 | 45 |
D | Silence zone | 50 | 40 |
Note:
1. Day time is reckoned in between 6 a.m. and 9 p.m.
2. Night time is reckoned in between 9 p.m. and 6 a.m.
3. Silence zone is defined as areas upto 100 meters around such premises as hospitals, educational institutions and courts. The silence zones are to be declared by the competent authority
4. Mixed categories of areas should be declared as “one of the four above mentioned categories by the competent authority and the corresponding standard shall apply