Water Quality
Water Quality Testing: Kits, Lab Tests and What to Test For
A TDS meter tells you which purification technology you need. A water test tells you whether your water is safe — and those are genuinely different questions. The gap between them is where the most serious water-related health risks in India sit, because the contaminants that cause cumulative, irreversible harm are invisible, tasteless and do not move a TDS reading.
If you are on municipal treated supply in a city with no documented groundwater contamination issue, a TDS reading plus a basic home kit is a reasonable level of diligence. If you are on a borewell, or anywhere in a documented arsenic or fluoride belt, a laboratory test is not optional — it is the single highest-value ₹2,000 you will spend on water.
Home kits vs laboratory analysis
| Parameter | Home kit adequate? | Notes |
|---|---|---|
| TDS | Yes — use a meter | ₹300 meter; decides technology choice |
| pH | Yes | Strips or a meter; BIS acceptable range 6.5–8.5 |
| Total hardness | Yes | Titration kits are reliable enough to size a softener |
| Free chlorine | Yes | Useful to confirm municipal disinfection is present |
| Iron | Reasonably | Colorimetric kits detect the levels that matter for staining and fouling |
| Nitrate | Reasonably | Screening only; confirm high readings in a lab |
| Arsenic | NO | Field kits are unreliable at the concentrations that matter. Lab only. |
| Fluoride | NO | Needs ion-selective electrode or equivalent. Lab only. |
| Heavy metals (Pb, Cr, Cd) | NO | Requires AAS/ICP instrumentation |
| Bacteria / coliform | NO | Requires culture or validated method |
What to test for, by situation
- MUNICIPAL SUPPLY, no known local issue — TDS, pH, hardness, free chlorine. Home kit is reasonable.
- BOREWELL, anywhere — full physico-chemical panel plus microbiology: TDS, pH, hardness, chlorides, iron, nitrate, fluoride, sulphate, and total coliform.
- GANGA–BRAHMAPUTRA BELT (West Bengal, Bihar, Assam, eastern UP) — add ARSENIC explicitly. This is the priority parameter in these states.
- RAJASTHAN, GUJARAT, ANDHRA PRADESH, TELANGANA — add FLUORIDE explicitly.
- NEAR INDUSTRY, TANNERIES OR PLATING UNITS — add heavy metals: lead, chromium, cadmium.
- COASTAL AREAS — add chlorides and check for salinity ingress.
- AGRICULTURAL AREAS — nitrate and pesticide screening.
- COMMERCIAL / INDUSTRIAL FEED — add silica, sulphates, alkalinity and SDI, which constrain RO recovery and pre-treatment design.
Important
Arsenic and fluoride cause cumulative, irreversible harm and are undetectable by taste, smell, appearance or TDS. If you are in an affected region and drawing groundwater, treat a laboratory test as essential rather than optional — and note that only RO removes them at household scale.
How to collect a sample properly
A laboratory result is only as good as the sample. Poor collection technique produces confidently wrong numbers, which is worse than no test.
- Use the containers the laboratory provides. Different parameters need different bottles and preservatives, and microbiology needs a sterile container.
- For a chemical sample, run the tap for 2–3 minutes first to flush standing water from the pipe, unless you are specifically testing for lead leaching from your own plumbing.
- For a microbiological sample, sterilise the tap outlet (flame or alcohol wipe), run briefly, then fill without touching the bottle rim or cap interior.
- Fill chemical bottles completely with no air gap where instructed.
- Label with date, time, exact source (which tap, borewell or tank) and your name.
- Deliver to the lab the same day, chilled. Microbiological samples degrade within hours — a coliform result from a sample that sat in a car for a day is meaningless.
- If you draw from multiple sources, sample each separately. A blended sample tells you about a blend that may not exist at any tap.
Costs and where to test
- Use a NABL-accredited laboratory. Accreditation is what makes the result defensible, and it matters if you later need it for a society dispute or a regulatory submission.
- Many state public health engineering departments and municipal laboratories test water at low cost for residents — worth checking before going private.
- Commercial and industrial buyers should ask the treatment supplier which parameters they need before testing, so you pay for one complete panel rather than two partial ones.
| Test | Indicative cost | Turnaround |
|---|---|---|
| Home TDS meter (one-off purchase) | ₹250 – ₹400 | Instant |
| Home multi-parameter kit | ₹500 – ₹2,000 | Minutes |
| Basic lab panel (physico-chemical) | ₹800 – ₹1,800 | 2–5 days |
| Standard drinking water panel per IS 10500 | ₹1,500 – ₹3,500 | 3–7 days |
| Arsenic (single parameter) | ₹500 – ₹1,200 | 3–7 days |
| Heavy metals panel | ₹1,500 – ₹3,000 | 5–10 days |
| Microbiological (coliform / E. coli) | ₹400 – ₹1,000 | 2–4 days |
| Full IS 10500 compliance panel | ₹5,000 – ₹12,000 | 7–14 days |
When to test
- Before buying any purifier — this determines what you actually need.
- Before specifying any commercial or industrial system. No credible quotation exists without it.
- Annually if you use groundwater, because aquifer chemistry shifts with water table and season.
- After any borewell deepening or new borewell — the chemistry can change completely.
- After local pipeline work, flooding, or any supply interruption, particularly for microbiology.
- If anyone in the household develops unexplained recurrent gastrointestinal symptoms.
- If you notice new staining, scaling, odour, taste change or discolouration.
Where to buy
We have not individually tested products in this category, so we are not going to rank them as though we had. Use the buying criteria above to judge listings yourself, and these searches as a starting point.
These are affiliate links. We may earn a commission at no extra cost to you, and it does not influence what this page says.
Frequently asked questions
How do I test for arsenic in my water?
You need a laboratory test — field kits are unreliable at the concentrations that matter, and a TDS meter cannot detect arsenic at all. Contact a NABL-accredited laboratory; a single arsenic parameter typically costs ₹500–₹1,200. If you are in West Bengal, Bihar, Assam or eastern UP and drawing groundwater, treat this as essential rather than optional.
How much does water testing cost in India?
A basic physico-chemical panel runs ₹800–₹1,800, a standard drinking-water panel per IS 10500 ₹1,500–₹3,500, and a full compliance panel ₹5,000–₹12,000. Individual parameters like arsenic (₹500–₹1,200) or coliform (₹400–₹1,000) can be ordered separately. Many municipal and state public health laboratories test at lower cost for residents.
Are home water testing kits accurate?
They are reasonably reliable for hardness, pH, chlorine, iron and nitrate as a screening tool, and that is genuinely useful. They are not adequate for arsenic, fluoride, heavy metals or microbiology — those need laboratory instrumentation. Use a kit for routine monitoring and a NABL lab for the decisions that matter.
How often should I test my borewell water?
Annually as a minimum, because aquifer chemistry shifts with the water table and season. Test additionally after deepening the borewell or drilling a new one, after flooding, and if you notice any change in taste, staining, odour or clarity. If your first test shows arsenic, fluoride or nitrate near limits, test more frequently and confirm your treatment is keeping output within limits.