Water quality report

Water quality in Delhi

Name: Groundwater quality: Delhi
Creator: CGWB groundwater monitoring 2018-2021 (EC-derived TDS)

~994mg/L average TDSElevated

Source: CGWB groundwater monitoring 2018-2021 (EC-derived TDS), 2021 (Govt. of India) Based on 1 nearby government monitoring point..

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TDS (average)

994 mg/L

Elevated

150–4512 mg/L range

Where 994 mg/L sits

994

0Ideal 300BIS 50012002000+

Your area reads High. BIS rates water up to 500 mg/L as acceptable and 150–300 mg/L as ideal for taste and health.

What this means for you in Delhi

Taste

Noticeably hard, with a flat or mineral taste.

Health

Above the BIS limit — purification is recommended for regular drinking.

Appliances

Promotes scaling (white deposits) on taps, geysers, kettles and RO membranes.

What to use

A reverse-osmosis (RO) purifier is the right fit here.

Other parameters that matter

TDS is the headline number, but drinking-water safety also depends on these (BIS IS 10500 limits):

Bacteriological (E. coli / coliform)

Nil in any 100 ml

Causes stomach infections; needs UV or boiling.

Fluoride

1.0 mg/L (max 1.5)

Excess causes dental & skeletal fluorosis.

Arsenic

0.01 mg/L

Toxic; long-term exposure is carcinogenic.

Nitrate

45 mg/L

Risky for infants (blue-baby syndrome).

Iron

0.3 mg/L

Metallic taste, staining of fixtures & clothes.

Total hardness

200 mg/L (max 600)

Scaling on taps, geysers & appliances.

Microbiological note: bacterial safety (E. coli/coliform) is not part of chemical groundwater monitoring — it needs a lab test of your own tap, and varies with pipe leaks and monsoon. UV purification (built into Boon Tap) inactivates bacteria and viruses; RO removes the dissolved contaminants above.

Why is TDS like this in Delhi?

Most Indian cities draw heavily on groundwater, which dissolves minerals and salts from the soil and rock it sits in. Over-extraction, ageing pipes and local geology push dissolved solids (TDS), hardness and sometimes fluoride, nitrate or arsenic above safe limits. Levels also shift between seasons. The figure above is an indicative area reading from government monitoring — your own tap can differ, so it’s worth testing.

Recommended for your water

Boon Tap

TDS here averages ~994 mg/L — above the BIS limit of 500 — so a reverse-osmosis (RO) purifier like Boon Tap is recommended.

Explore Boon Tap & check delivery

Delhi water — questions

What is the TDS of water in Delhi?

Groundwater near Delhi has an average TDS of about 994 mg/L, above the BIS acceptable limit of 500 mg/L, based on government monitoring data (CGWB groundwater monitoring 2018-2021 (EC-derived TDS), 2021). Levels range roughly 150–4512 mg/L across nearby monitoring points.

Is tap water safe to drink in Delhi?

With TDS around 994 mg/L (above the BIS limit of 500), water in Delhi is generally not ideal for direct drinking — an RO purifier is recommended. Always test your own supply.

Do I need an RO water purifier in Delhi?

Yes — high TDS/hardness in Delhi means reverse osmosis (RO) is the appropriate technology to bring water within safe, palatable limits.

Data sources

Disclaimer: Figures are indicative area estimates from government groundwater monitoring nearest to this location and may differ from your exact tap/municipal supply. They are not a substitute for a lab test of your own water.