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Minimum and Maximum Acceptable TDS Level in Drinking Water

Drinking Water TDS

Drinking water should contain sufficient minerals to keep you healthy and should not contain excess minerals that become overloaded in the body. In this article, we will provide details about the acceptable minimum and maximum TDS (Total dissolved solids) Limits for drinking water.

TDS Level (Milligram/Litter) Palatability of Water
Less than 300 Excellent
300-500 Good
600-900 Fair
900-1200 Poor
Above 1200 Unacceptable

Note: The Palatability of Water only describes the acceptability of the taste of water. It does not mean this should be healthy or unhealthy.

TDS Level in Drinking Water – Acceptable & Unacceptable

TDS Level (Milligram/Litter) Remarks
Less than 50 Unacceptable because of lack of important minerals
50 – 150 Acceptable for Drinking (Excellent – where water is polluted with industrial wastes and sewage)
150 – 250 Good – Acceptable for Drinking (Healthiest in regard to cardiovascular health.)
250 – 350 Good – Acceptable drinking (Healthy in regard to cardiovascular health.)
350 – 500 Fair
500 – 900 Less Acceptable for Drinking
900 – 1200 Least acceptable for drinking; try to avoid drinking water with TDS level above 900 wherever possible
1200 – 2000 Very Least acceptable for drinking where other water sources are not available.
Above 2000 Unacceptable for drinking
  1. The Upper Limit of TDS level in drinking water set by Bureau of Indian Standards (BIS) is 500 ppm (500 milligrams per liter).
  2. If water TDS level is less than 100, it may result in hair fall and heart diseases.
  3. Water with TDS level less than 100 has the high dissolvent capacity, which even dissolves a small quantity of plastic, in which it is kept. The dissolved plastic in water can cause cancer and can also reduce immunity. Plastic in water can also become a carrier for other toxins, heavy metals, arsenic, fluoride, or aluminum.


However, there are different recommendations prescribed by different governments and organizations. In my personal opinion, nowadays water is polluted with chemicals, industrial waste, sewage, etc., which is actually very harmful to our health. It applies especially to India where industries are poorly regulated for disposal of these waste matters.

The above-suggested table should be fine where there is no water pollution. Otherwise, the following table is most recommendable in my personal opinion.

Level of TDS parts per million (ppm) Rating
Between 50 – 150 Excellent (For everyone)
150 – 250 Good (for athletes)
250 – 300 Fair (Might be bad for kidneys)
300 – 500 Poor (Might be very bad for kidneys)
Above 1,200 Unacceptable
Reference: This table is suggested by Kent RO.

In my opinion, a TDS range from 50 to 150 is best for drinking. In this TDS, most of recent RO systems remove the several harmful solutes.

When do we need RO Purifier?

If water has TDS level above 500 mg per litter (500 ppm), then you should use RO purifier.

Setting TDS limit in RO Purifier

You should set 50 to 150 ppm TDS limit in RO Purifier for drinking healthiest water.

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