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Uniwater — Wellness starts with clean water

India

Uniwater in Kolkata.

Our home city. Treated municipal in central Kolkata; borewell augmentation common across the EM Bypass suburbs.

The water

What Kolkata water actually looks like.

Salt Lake, Rajarhat, and New Town run on a mix of municipal and borewell. Arsenic risk in some suburban borewells — testing matters. Central Kolkata is largely treated supply; hardness moderate, iron usually low.

Service areas

Where we’re active in Kolkata.

Not an exhaustive list. If your locality isn’t mentioned, we likely still serve it — the survey response is the same.

Ballygunge

Alipore

Park Street

Salt Lake

New Town

Rajarhat

Lake Town

Tollygunge

Behala

Hindustan Park

Water by locality

What the water reads, area by area in Kolkata.

Indicative ranges only — Kolkata from our field experience, other cities from published regional groundwater studies. Groundwater varies borehole to borehole, so the number that sizes your system is the one our engineer measures at your address, not the band below.

Park Street

Supply: KMC treated

Iron
<0.3 ppm
Hardness
100–180 ppm
TDS
180–320 ppm

Mild scale

BathSoft / Drinking

Alipore

Supply: KMC treated

Iron
<0.3 ppm
Hardness
120–200 ppm
TDS
200–350 ppm

Light scale, taste

BathSoft / Drinking

Ballygunge

Supply: KMC treated

Iron
<0.3 ppm
Hardness
120–200 ppm
TDS
200–350 ppm

Light scale

BathSoft / Drinking

Hindustan Park

Supply: KMC treated

Iron
<0.3 ppm
Hardness
120–200 ppm
TDS
200–350 ppm

Light scale

BathSoft / Drinking

Tollygunge

Supply: KMC + borewell

Iron
0.3–1 ppm
Hardness
150–280 ppm
TDS
300–500 ppm

Scale, occasional staining

HomeSoft + BathSoft

Lake Town

Supply: Mixed

Iron
0.5–2 ppm
Hardness
200–350 ppm
TDS
350–650 ppm

Staining + scale

Iron filter + HomeSoft

Behala

Supply: Borewell/mixed

Iron
0.5–2 ppm
Hardness
200–350 ppm
TDS
350–650 ppm

Yellow staining, scale

Iron filter + HomeSoft

Salt Lake

Supply: Borewell/mixed

Iron
0.5–3 ppm
Hardness
200–400 ppm
TDS
400–800 ppm

Yellow stains, metallic taste, scale

Iron filter + HomeSoft

Rajarhat

Supply: Borewell

Iron
0.8–3.5 ppm
Hardness
250–450 ppm
TDS
500–900 ppm

Heavy staining + scale

Iron filter + HomeSoft

New Town

Supply: Borewell

Iron
0.8–3.5 ppm
Hardness
250–450 ppm
TDS
500–900 ppm

Heavy staining + scale

Iron filter + HomeSoft

BIS acceptable limits (IS 10500): iron 0.3, hardness 200, TDS 500 mg/L.

Read further

Iron in Kolkata water — the long read.

Why central KMC localities read low while Salt Lake, New Town, and Rajarhat run high; how iron has to be removed before softening; and why “zero-maintenance” iron filters fail.

The Uniwater local service team at a monthly visit

The team

Local engineers. Not subcontracted.

Head office in Shribhumi, Kolkata. Survey response within 24 hours across the city; engineer team based locally, not subcontracted.

Real installs

Recent installs in Kolkata.

Uniwater system installed in a false ceiling void

Ballygunge

Uniwater system installed inside the plumbing shaft

Alipore

Uniwater unit installed under the counter

Park Street

Case study in Kolkata

Charnock Hospital

Drinking-water RO at point of use, building inlet WTP, monthly AMC.

Read the Charnock Hospital case study

Frequently asked

Water questions, answered for Kolkata.

Does a water softener remove iron?
No. A softener targets hardness — it swaps calcium and magnesium for sodium on an ion-exchange resin. Iron is a different problem: dissolved iron fouls and coats softening resin, so it has to be taken out upstream by a dedicated iron-removal filter. On borewell-fed supply the correct sequence is iron pre-treatment first, softening second.
Why does my water turn yellow / orange after standing?
That is dissolved iron oxidising. Water from a borewell can look clear at the tap, but once it sits and meets air the iron turns to rust and the water goes yellow or orange — the same stain you see on basins, tiles, and white laundry, often with a metallic taste. It is a treatable water-chemistry issue, removed by an iron filter sized to the iron load.
Iron remover vs water softener — which do I need?
It depends on what your water actually carries, which is why we test before we size. Iron staining (yellow/orange marks, metallic taste) calls for an iron-removal filter. Scale on geysers, fittings, and glassware calls for a softener. Borewell-fed homes usually need both, in that order — iron filter first to protect the softener resin. The free survey test tells you which.
Is borewell water in Salt Lake / New Town / Rajarhat safe?
These areas run largely on borewell augmentation, and borewell chemistry varies block to block. Iron and hardness are common and visible; some suburban boreholes also carry arsenic, which you cannot see or taste. That is exactly why a free on-site water test is part of every survey — we read your specific borehole before sizing anything, rather than assuming a city-wide number.
How often does the system need servicing?
Year one of AMC is included with every install. Comprehensive tier is a monthly engineer visit; Standard tier is quarterly. Each visit covers parameter testing (hardness, iron, TDS, pH), backwash and regeneration checks, salt top-up where applicable, and a same-day written report. Iron filters and softeners are media-based, so periodic backwash verification is what keeps them performing.

Service is the system

Most water companies show up when something breaks. We show up every month.

Automated.

Backwash, regeneration, flush — the system handles routine cycles on a schedule. No valves to turn.

Verified by an engineer.

Monthly site visit. Pressure check, media inspection, hardness/iron spot test, written report.

Owned by us.

If something needs replacement or recalibration, we do it. No customer chasing parts.

How our service works

The discipline that decides year four.

Your next step

Ready for a free survey in Kolkata?

A Uniwater engineer will visit, test your water, and respond within one business day.