Minimum TDS Level for Drinking Water in India (Total Dissolved Solids)

TDS is a common terminology in use whenever you discuss water purification.

What exactly is TDS? 

TDS in water
Information Source: WHO

Let us look at this concept in brief.

Water is the Best Health Drink in the world that contains no fat, no calories, and no cholesterol.

Health Authorities often check the following to make sure that the water is safe.

  • PH
  • Presence of Dissolved Oxygen
  • Color
  • Hardness
  • Presence of the Bacterial Growth, Algae, algae
  • Total Dissolved Solids (TDS)

Total Dissolved Solids

A water molecule in its purest form contains 2 atoms of Hydrogen and 1 atom of Oxygen.

But, the water available from natural sources like rivers, lakes, and groundwater does not conform to this molecular formula.

This is because water contains a lot of organic and inorganic salts dissolved in it.

This water contains calcium, magnesium, sodium, potassium, sulfates, carbonates, nitrates, and fluorides among many other salts.

This seems to be a very long list, but the positive aspect is that you need a majority of these salts for your overall growth.

You need a certain proportion of these solids in your drinking water.

However, water can contain other contaminants such as heavy metals like arsenic, lead, and even mercury. These chemicals are dangerous and require elimination.

TDS up to a certain level is acceptable for human consumption.

It is only when the TDS proportion exceeds 500 (500 ppm) does it become hazardous. You would require the use of water purifiers to eliminate the excess TDS.

The Hardness of the Drinking water is created by naturally occurring substances like calcium (Ca) and magnesium (Mg).

Total Dissolved Solids (TDS) are the total amount of the mobile charged ions in a given volume of water which include minerals, salts, cations, anions, and metals.

TDS = The Total number of cations and anions in the water.

Rain Water is the Purest form of water, and the TDS of rainwater is few tens of mg/L.

TDS is represented in units of mg per unit volume of the water ( mg/l ) that is also referred to as parts per million ( ppm ).

The Dissolved salts come from both natural and inorganic sources. The Organic sources of the dissolved salts include leaves, plankton, trash from industries, pesticides, fertilizers and more.

Water will also pick up metals like lead and copper when it travels through the pipelines.

The Dissolved salts also come from the artificial sources such as rocks, atmospheric gasses, nitrogen iron, and minerals also.

Over time,  Water purifiers will lose the capability of removing the Dissolved salts from water.

You should observe the Quality of the membrane in your water filter and should replace it when required.

Please note that the presence of the Dissolved salts in water will affect the taste.

According to World Health Organization, TDS level less than 300 mg/litre is considered as excellent, between 300 and 600 mg/liter is good, 600-900 is fair, 900 – 1200 is poor and TDS level more than 1200 mg/liter is unacceptable.

In India, If the TDS level is above 500mg/liter, the water is considered as disagreeable. But, due to the lack of water resources, people are drinking water that has greater TDS Levels.

TDS in Indian Water

According to the BIS Standards, the maximum desirable TDS is 300 mg/l and maximum permissible is 600 mg/l.

WHO states that the water containing TDS concentrations below 900 mg/litre are acceptable for the consumers. Lesser the TDS, Better the Water

How to Reduce the TDS in Water?

There are a lot of RO water purifiers available that can reduce or remove the Dissolved salts in the water.

The most widely used Water Purifications Systems are Carbon filtration, Reverse Osmosis, Distillation, and Deionization.

In Carbon filtration, the Charcol consumes many toxic compounds when the water is passed through the activated charcoal.

Reverse Osmosis

Reverse Osmosis is one of the most commonly used filtration systems that removes all the dissolved contaminants in the water. The Only problem with RO is, It needs a lot of water.

The RO process splits the water into two parts and drives the dissolved salts out from the part into other.

As I mentioned above, Reverse osmosis requires a lot of water, and the wastage is also high.

If you input 3 Litres of Water into the RO Process, you will get one litre of Clean water and 2 liters of Dirty water.

So, when you are planning to buy a Ro Water Filter, Make sure you collect the Reject water and use it for cleaning the house. Don’t waste the Reject Water of Reverse Osmosis purification system.



Distillation involves boiling the water and produce the water vapor that rises to a cooler surface and condensed back to liquid. Distillation is one of the oldest forms of water purification which is still used to convert the sea water to drinking water.


In this process, the Dissolved salts in the water are removed through the ion exchange. By Controlling the electric charge of the ions in the water, the Deionization removes the TDS from the water.

99 thoughts on “Minimum TDS Level for Drinking Water in India (Total Dissolved Solids)”

  1. I have installed a water softener and then 7 stage Ro plant now the water coming from ro plant with tds 50 to 60 and tastes a bit different is it a healthy water or it lacks minerals

    • UV + UF water purifier will be good. If you are not sure about the water quality, You can also opt for RO that comes with a Mineralizer.

  2. Hello sir my Borewell water tds is around 190 to 210
    But when I fill it in water bottle the water bottle colour changes to yellowish around 1 day i think my Borewell water has soil can i purchase uv
    Or uv+uf…

    • Go with UV + UF Model only. Because UV can kill bacteria and virus but it cannot remove the mud and suspended impurities from the water. UF can remove mud and other impurities. So, you can buy UV + UF model.

  3. Hi, i have purchased ro,uv, mineral, tds, uf water purifier… When I checked tab water of the borewell it shows 190 to 200 ppm tds but taste is salty and after filter it shows 9 ppm… When I check with corporation water.. Tab water tds is 58-60 and after filter it shows 10-13 ppm…. Now i am confused what should i do….
    When i drink corporation water directly some times it comes with few oily and after stock water in the pot… In the morning some mud or something like that shows at pot bottom…. The second option drink borewell water directly but taste is saulty…
    So what should i do… With ro filter or without… Pls reply…

    • Hi, The TDS Levels in both Borewell and Corporation water are Good. There is no need for an RO water purifier in such cases if the TDS is less than 400ppm. It is better to install a UV UF water purifier For Tap that is connected to corporation water. The UF filter is capable of removing all the suspended impurities in the water. The UV filter will take care of the bacteria and virus. In General, if the TDS is around 200ppm, the water won’t be salty but in your case it is salty. So it is better to drink corporation water by purifying it with UV + UF water purifier.

  4. TDS in tap water at my place is 700, can you tell what should be used between an RO and water purifier(aquaguard Nova). Only thing I want is healthy water.

    • If the TDS in your water source is above 500ppm, it is better to install an RO water purifier that comes with a TDS Controller.

  5. My New (upgraded) RO+UV system has reduced my water TDS to 6-7 in Bangalore is it safe to drink such low TDS water or should I get it increased.

    • TDS is very low. The water does not have any mineral content. No need to install an RO when the TDS in your water source is below 500ppm.

    • TDS Level 30 is safe no need to worry. No need to use an RO water purifier with TDS Controller if the TDS is below 400ppm. 100 to 300 is the ideal level.

    • TDS in your water source is excellent. There is no need to change it. If there is dust or any bacteria, install an UV water purifier.

  6. My tap water TDS reading is between 300-330. Could you please suggest if UV+UF water purifier will suffice? Kindly reply ASAP.

  7. My new RO has reduced TDS to 43 (pureit eco). However, it has a mineraliser ( they call it TDS modulator). Should it be OK. Also plz tell if mineraliser enhances taste without increasing TDS.

  8. Hello Sir,
    The ground water for us is having some odd sewage smell. We were using KENT Grand and there are multiple filtering stages. I can see the TDS around 1000 from tap water and after filtration its around 50. But due to multiple filtration im facing frequent failures and keep on changing membranes. Now im planning to buy a new one with minimal filtration, as per your suggestion adding mineral cartridge instead of UV is one suggestion but is it really worthy? How can i rely on it? Carbon Sediment RO Mineral Post Carbon is this fine ?

  9. we use Ro system for our drinking water purposes.our row water TDS valuve is 70ppm and out put water TDs from ro system is it suitable for drinking purposes? Please give solution if it is not in safe condition.

    • It is safe only. But why use an RO water purifier when the TDS is already low. TDS 70ppm is already good. No need for an RO. It is safe but no need. Simple UV UF is enough

  10. My TDS is 750 and i am not sure of other values. I am against usage of RO as it would cause wastage of water. For this level of TDS is RO compulsory?


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