What Is an Acceptable TDS Level for Drinking Water in India?

Fill a glass from your kitchen tap, then fill another from a bottle you bought on a train journey. They rarely taste the same. Occasionally one feels bland, while sometimes the other tastes faintly salty or metallic. 

This difference has a name: Total Dissolved Solids, or TDS. It reveals a lot about your water quality and the amount of dissolved solids present in the water you drink every day. 

Here's why TDS levels in drinking water deserve more attention than most people realise. 

What Is TDS in Drinking Water? 

TDS stands for Total Dissolved Solids. It's the term used for the minerals and salts, along with small traces of organic matter, that are naturally present in water.    

According to the World Health Organisation's background documentation on TDS, the main contributors are usually calcium, magnesium, sodium, and potassium, as well as compounds such as chlorides, sulphates, and carbonates.  

The health value of water doesn’t depend on the number of minerals dissolved in it. The important thing is whether the TDS level is within the right range. 

So, what are the acceptable drinking TDS levels in India? This is where official standards come in. Here's what the Bureau of Indian Standards and the World Health Organisation actually say.      

What Do BIS and WHO Say About Acceptable TDS Levels?

There's no single global number for an “ideal TDS level”. Rather than recommending one ideal TDS level, BIS and WHO provide different benchmarks based on water quality and palatability.

The Bureau of Indian Standards (BIS), under IS 10500:2012, sets an acceptable limit of 500 mg/l for total dissolved solids in drinking water. Where no alternative source is available, the limit can be up to 2000 mg/l.  

BIS also links higher TDS to specific effects: hardness, scaling, cloudy water, and a noticeably salty or bitter taste.  

Note: The World Health Organisation takes a different approach. Its background documentation on TDS rates water for palatability, based on taster panel assessments, rather than setting a health-based safety classification. 

These benchmarks help assess TDS acceptability, but the effect on water depends on both the TDS level and the substances dissolved in it. 

Why Do TDS Levels Outside the Acceptable Range Matter? 

A number on a chart only matters once you know what it actually does to your water. BIS and WHO document effects at both ends of the scale, not just the high side that most people worry about.   

When TDS Is Too High 

Under IS 10500:2012, BIS lists a specific set of effects tied to high TDS: 

• Hardness and scaly deposits 

• Sediment and cloudy, discoloured water 

• Staining on fixtures and fittings 

• A salty or bitter taste 

• Corrosion of pipes and fittings over time 

These aren't assumptions extended beyond the standard. They are the effects BIS itself records against this parameter. These effects can reduce water’s taste, appearance, and suitability for regular household use. However, TDS alone cannot determine whether water is microbiologically or chemically safe.

When TDS Is Too Low 

There's no BIS clause for the lower end, but the pattern is visible in how WHO's own palatability scale is structured. Water rated "excellent" or "good" isn't the water with the least possible TDS. The water source sits within a defined band, not at zero.

Water with very low TDS tends to: 

• Taste noticeably bland

• Contain fewer naturally occurring minerals (BIS and WHO both associate with acceptable drinking water) 

Since both extremes matter, the practical step is knowing your water's TDS number. Water with very low TDS may taste flat and contain fewer dissolved minerals. However, a low TDS reading does not automatically mean the water is safe, as it does not reveal the presence of microorganisms or specific chemical contaminants.

How to Check Your Drinking Water TDS Levels at Home? 

You don't need a lab to get a starting number. A TDS meter can provide a useful initial reading of dissolved solids in your water. However, it cannot identify bacteria or individual chemical contaminants. Here’s how you can do it:  

Quick Check Using a TDS Meter 

A digital TDS meter is a small pen-style device that reads ppm within seconds when dipped into a glass of water. It provides a useful starting measurement, but laboratory testing is needed because TDS can vary significantly between different sources of water: 

• Kitchen tap water 

• Your RO water purifier output 

• Any tanker or borewell water you use 

Detailed Check: Lab Testing 

For a full breakdown of exactly what's dissolved in your water, a certified water-testing lab is the more thorough option. This matters more if your everyday source is a borewell or tanker rather than a treated municipal supply, where variation tends to be higher. 

If your reading falls outside the BIS acceptable range, the next step is choosing water purification systems that match your water quality.

Maintaining Balanced TDS Levels at Home with KENT 

Bringing the TDS level into an acceptable range is only half the job. Maintaining the right TDS limit, without overcorrecting, is the harder part.  

• TDS Regulation Matters

A reverse osmosis water purifier is built to bring high-TDS water down to a safe range. An RO membrane reduces excess dissolved salts in high-TDS water. However, without appropriate TDS regulation, it may also reduce naturally occurring minerals along with unwanted dissolved impurities.

• Regulating TDS, Not Just Removing Impurities 

This is where KENT's RO water purifiers are built around TDS regulation rather than solely removing impurities from water. Our Mineral RO technology, along with the TDS Control feature, is designed to bring purified water's TDS to a suitable level while retaining natural minerals. 

It's a smaller detail, but it reflects the same idea we have built our wider home wellness range around: purity as the foundation of a healthy life, not purity as the absence of everything. 

Since water quality varies across India, choosing the right water purifier for home should begin with testing your water source and understanding its TDS level.

KENT Water Purification Solutions for Every Water Source 

There isn't one purifier type that suits every home, because there isn't one type of water across the country. Test your source water's TDS and then match the water filter to that number.  

KENT offers water purifiers for the home designed for different water sources and purification requirements, helping households choose a suitable solution for their water quality.

1. Basic Water Filtration 

Not every home requires advanced purification. In many regions, the water supply is already potable, with low TDS and no harmful dissolved impurities. In these areas, the priority is to remove bacteria, cysts and other microbiological contaminants rather than to reduce the TDS. 

KENT's Gold range of Gravity Water Purifiers uses advanced hollow fibre ultrafiltration (UF) technology with a pore size of 0.1 microns to remove bacteria and cysts without using chemicals like chlorine, bromine, or iodine.  

By ensuring 100% microbe-free water, our gravity water purifiers safeguard your family against common waterborne diseases while preserving the natural composition of the water.  

2. Lower-TDS Sources: Treated Municipal or Tap Water 

Where the incoming water is already low in TDS, removing dissolved solids further isn't the priority; biological safety is. KENT's UV purifier range is ideal for purifying tap and municipal corporation low-TDS water supplies.  

If you want a double purification process of UV + UF + alkaline that removes bacteria, viruses, and cysts while enhancing the water to an 8-9.5 pH level, the KENT Maxx Alkaline B UV Water Purifier is a suitable option. You get:  

• Offers a purification capacity of up to 60 L/hr and a 7-litre storage tank for continued access to purified water during power interruptions

• Activated carbon pre-filter that reduces bad taste and odour 

• Fully automatic operations like a UV Fail Alarm that gives you an alert when the UV lamp becomes inefficient 

• Transparent detachable tank to easily clean the storage tank without any technical assistance 

We also have other options in UV water purifiers to suit different household needs. Choose a water purifier based on your family's daily drinking water requirements and your water supply.  

3. High-TDS Sources: Borewell, Tanker, Brackish Water 

For water above the BIS acceptable limit, RO-based purification is designed to bring dissolved solids down to a safe range.  

The NSF- & ISI-certified KENT Grand Plus combines RO, UV, UF, alkaline and copper purification with TDS control and UV purification in the storage tank. Its Mineral RO™ technology is designed to help maintain the desired TDS level while retaining essential natural minerals.

You get mineral-rich, alkaline drinking water with pH levels of 9.5+. With this water purifier, you can regulate the body’s pH levels, reduce acidity, fortify your health, and boost your immunity. 

If you want real-time monitoring of water quality and filter life, the KENT Grand IoT RO Water Purifier offers the same high-TDS suitability. You get multiple purification processes of RO+UV+UF+Alkaline+Copper with added advanced IoT intelligence features like:  

• Automatic service call registration in case of fault  

• Timely notifications of filter/membrane life and real-time water quality

• Replacement part history  

• RO flow rate 

Match the purification type to the TDS number rather than assuming an RO water purifier is always the right fit. KENT water purifiers are built for these different source conditions. Make the choice based on your water rather than a one-size assumption.   

Purity Starts with the Right TDS Balance!  

There's no single "correct" TDS number. Once you see why, it all makes more sense. Water that's too heavy or too stripped both comes at a cost. The goal isn't zero, and it isn't as high as the water will allow; it's balance. 

At KENT, we not only remove what shouldn't be in your water but also keep what should stay. It's why our water purifiers are built around managing TDS, not just erasing it, so every glass comes out balanced, not just filtered.  

It's the same thinking behind everything else we build for your home because purity, done right, is the foundation everything else stands on. 

Know your water source, check its TDS level and explore KENT’s range to find a water purifier for home suited to your water conditions. The right balance of purification and TDS management can help support safer, better-tasting drinking water every day.

FAQs 

1. What is the acceptable TDS limit as per BIS? 
    Under IS 10500:2012, the acceptable limit is 500 mg/l, and it is permissible to go up to 2000 mg/l only where no alternate source is available. 

2. Is 0 TDS water safe to drink?  
   Ans. A zero TDS reading does not automatically establish whether water is safe or unsafe. It only indicates that very few dissolved solids are present. Water safety also depends on microbiological and chemical contaminants that a TDS meter cannot detect. 

3. What TDS level means I need an RO purifier?  
   Ans. RO purification may be suitable when the incoming water has high TDS, particularly above the BIS acceptable limit of 500 mg/L. However, the decision should also consider the water source and the specific contaminants present.

4. How often should I test my purifier's water?  
   Ans. There is no single official testing interval for every household. Check the TDS periodically, after a change in water source, or when you notice changes in taste. Laboratory testing is recommended where a complete water-quality assessment is needed.