Indian Standard for Drinking Water specifications

WHO produces international norms on water quality and human health in the form of guidelines that are used as the basis for regulation and standard setting, in developing and developed countries worldwide. The quality of drinking water is a powerful environmental determinant of health. Assurance of drinking water safety is a foundation for the prevention and control of waterborne diseases. The guidelines developed by WHO are prepared through a vast global consultative process involving WHO member states (India is the member state), national authorities and international agencies, in consultation with the WHO Expert Advisory Panel.

Parameters	Standard limits as per WHO guidelines (mg/L)
Acrylamide	0.0005
Alachor	0.02
Aldicarb	0.01
Aldrin and Dieldrin	0.00003
Ammonia	1.5
Antimony	0.02
Arsenic	0.01
Atrazine	0.002
Barium	0.7
Benzene	0.01
Benzo(?)pyrene	0.0007
Boron	0.5
Bromate	0.01
Bromodichloromethane (BDCM)	0.06
Bromoform	0.1
Cadmium	0.003
Carbofuran	0.007
Carbon tetrachloride	0.004
Chlorate	0.7
Chlordane	0.0002
Chloramines	0.5 - 1.5
Chloride	200 - 300
Chlorine	5
Chlorite	0.7
Chloroform	0.3
Chlorotoluron	0.03
Chlorpyrifos	0.03
Chromium	0.05
Colour in drinking water	No visible colour
Copper	2.0
Cyanazine	0.0006
Cyanide	0.07
1,2-Dichlorobenzene	1.0
1,4-Dichlorobenzene	0.3
1,2-Dichloroethane	0.03
Dichloromethane	0.02
2,4-Dichlorophenoxyacetic acid	0.03
DDT and metabolites	0.001
Di(2-ethylhexyl)phthalate	0.008
1,2-Dichloroethylene	0.05
1,2-Dichloropropane	0.04
Dimethonate	0.006
1,4-Dioxane	0.05
Dissolved oxygen	No health-based guideline value is recommended
Edetic acid (EDTA)	0.6
Endrin	0.0006
Epichlorohydrin	0.0004
Ethylbenzene	0.3
Fenoprop	0.009
Fluoride	1.5
Hexachlorobutadiene	0.0006
Iron	No health-based guideline value is proposed
Isoproturon	0.009
Lead	0.01
Lindane	0.002
Manganese	0.4
Mercury	0.006
Methoxychlor	0.02
Metolachlor	0.01
Microcystin-LR	0.001
Molinate	0.006
Molybdenum	0.07
Monochloroacetate	0.02
N-Nitrosodimethylamine	0.0001
Nickel	0.07
Nitrate	50
Nitrilotriacetic acid (NTA)	0.2
Nitrite	3
Pendimethalin	0.02
Pentachlorophenol	0.009
Permethrin	0.3
pH	No health-based guideline value is proposed
Pyriproxyfen	0.3
Selenium	0.01
Simazine	0.002
Sulphate	No health-based guideline value has been derived
Styrene	0.02
Terbuthylazine	0.007
Tetrachloroethylene	0.04
Toluene	0.7
Total dissolved solids (TDS)	No health-based guideline value is proposed
Trichloroacetate	0.2
Trichloroethylene	0.02
2,4,6,-Trichlorophenol	0.2
Trifluralin	0.02
Trutuim	10000 Bq/L
Uranium	0.015
Vinyl chloride	0.0003
Xylenes-total	0.5
Zinc	No health-based guideline value is proposed

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What does ppm mean?

This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contaminate per unit volume of water. Seeing ppm or mg/L on a lab report means the same thing.
One ppm is equivalent to the absolute fractional amount multiplied by one million. A better way to think of ppm is to visualize putting four drops of ink in a 55-gallon barrel of water and mixing it thoroughly. This procedure would produce an ink concentration of 1 ppm. Some other analogies that may help you visualize the scale involved with ppm. One ppm is like:

• one inch in 16 miles,
• one second in 11.5 days,
• one minute in two years.

An even smaller concentration measurement is parts per billion (ppb). One ppb is one part in 1 billion. Because a ppb is a much lower concentration, some analogies would be :

• one sheet in a roll of toilet paper stretching from New York to London,
• one second in nearly 32 years, or
• one pinch of salt in 10 tons of potato chips

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HM Digital TDS-3 Handheld TDS Meter With Carrying Case, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy

 A TDS meter (aka ppm pen, nutrient tester, tds stick) is an inexpensive and convenient digital tool to instantly check your overall water quality. TDS = Total Dissolved Solids, which is any salt, metal or mineral in the water. With the push of a button, the TDS-3 can tell you your overall water purity level, which will be displayed on the screen in ppm (parts per million). The lower the TDS level, the purer the water, with 0 ppm being pure H2O. The TDS-3 is great for checking your tap water quality, or knowing when to change a filter. (The meter does not test for biological contaminants.) The TDS-3 is a great tool for drinking water, water filtration and purification, colloidal silver, hydroponics (test your nutrients), aquariums, RO/DI systems, pools and spas, commercial and industrial applications and more. The TDS-3 is a rugged model that includes a protective carrying case. This is the world's most popular handheld TDS meter for industry professionals.

Part Number	TDS-3
Item Weight	2.4 ounces
Product Dimensions	6 x 1.5 x 1 inches
Item model number	TDS-3
Batteries	2 LR44 batteries required. (included)
Size	0 - 9990 ppm. TDS Range, 1 ppm Resolution, +/- 3% Readout Accuracy
Color	Style 1
Material	plastic
Pattern	meter
Item Package Quantity	1
Number Of Pieces	10
Temperature Range	0/80 degrees_celsius
Display Style	LCD
Batteries Included?	Yes
Batteries Required?	Yes
Average Battery Life	3 hours

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