Arsenic contamination of groundwater is one of India's most severe and underreported water crises. Over 60 million Indians drink arsenic-contaminated water daily — many without knowing it, since arsenic is colourless, odourless, and tasteless. The consequences — cancers, organ damage, neurological harm — take years to manifest but are largely irreversible. This guide tells you everything you need to protect your family.

What Is Arsenic and How Does It Enter Water?

Arsenic is a naturally occurring metalloid element found in Earth's crust. In groundwater, arsenic enters through:

  • Natural geological sources: Weathering of arsenic-rich sedimentary rocks, particularly in alluvial plains
  • Industrial pollution: Mining, smelting, coal burning, and pesticide manufacturing discharge arsenic into groundwater
  • Agricultural chemicals: Arsenic-based pesticides (now banned but legacy contamination remains) in agricultural areas
  • Excessive groundwater extraction: Lowering the water table brings arsenic from deeper, higher-concentration zones

India's Ganga-Brahmaputra alluvial plains are particularly vulnerable because arsenic-rich Himalayan sediment has accumulated there over millions of years.

Arsenic-Affected States in India

State Affected Districts Max Arsenic Level (ppb) Population at Risk
West Bengal Malda, Murshidabad, Nadia, 24 Parganas Up to 3200 ppb ~20 million
Bihar Patna, Bhojpur, Vaishali, Saran Up to 550 ppb ~10 million
Uttar Pradesh Ballia, Ghazipur, Varanasi Up to 688 ppb ~6 million
Assam Jorhat, Dibrugarh, Lakhimpur Up to 580 ppb ~5 million
Jharkhand Sahebganj, Rajmahal Up to 350 ppb ~2 million
Punjab Bathinda, Faridkot, Mansa Up to 688 ppb ~3 million

WHO safe limit for arsenic in drinking water: 10 ppb (micrograms per litre). Indian BIS standard: 10 ppb.

Health Effects of Chronic Arsenic Exposure

Short-Term Exposure (Acute Arsenic Poisoning)

Consuming very high arsenic concentrations causes acute poisoning with nausea, vomiting, diarrhoea, muscle cramps, and cardiovascular collapse. This is rare in drinking water contexts — most Indian arsenic exposure is chronic, low-level, and far more insidious.

Long-Term Chronic Exposure

Drinking arsenic-contaminated water over years and decades causes:

  • Arsenicosis (skin manifestations): The first visible sign — dark pigmentation spots, hardened skin patches (keratosis), and eventually skin lesions. Affected skin looks as though it has been "burned."
  • Cancers: Arsenic is a Group 1 carcinogen. Chronic exposure significantly increases risk of skin cancer, bladder cancer, kidney cancer, and lung cancer.
  • Peripheral neuropathy: Weakness, numbness, and burning sensation in hands and feet
  • Liver damage: Enlarged liver, jaundice, and portal hypertension
  • Cardiovascular disease: Atherosclerosis, heart disease, and hypertension
  • Developmental harm in children: Lower IQ, cognitive impairment, and growth retardation

How to Remove Arsenic from Drinking Water

Method Arsenic Removal Efficiency Notes
Boiling No — concentrates arsenic 0% Dangerous — makes it worse
Activated Carbon Minimal 5–10% Ineffective for arsenic
UV Purifier No 0% Only kills microorganisms
Reverse Osmosis (RO) Yes (Arsenic V primarily) 85–95% Most practical home solution
Iron-coagulation filter + RO Yes (Arsenic III + V) 95–99% Best for high-arsenic areas

Important: Arsenic exists in two forms in groundwater — Arsenic III (arsenite) and Arsenic V (arsenate). Standard RO membranes primarily remove Arsenic V. For high-arsenic areas (West Bengal, Bihar), an oxidation pre-treatment stage converts Arsenic III to Arsenic V before RO filtration, achieving higher removal rates.

Alkin's Solution for Arsenic-Affected Areas

Alkin's RO purifiers are designed for Indian water conditions, including high-arsenic groundwater. For areas with documented arsenic contamination, Alkin recommends:

  • Multi-stage RO system with high-rejection membrane (95%+ TDS removal)
  • Optional oxidation pre-filter stage for Arsenic III conversion in severely affected areas
  • Regular water testing every 6 months to monitor arsenic levels
  • Alkaline remineralization stage to restore beneficial minerals after high-rejection RO

Contact Alkin to get a free arsenic test in your area and the right purifier recommendation for your specific water contamination level.

FAQs — Arsenic in Drinking Water India

How can I test if my water contains arsenic?
Arsenic cannot be detected by taste, smell, or colour. The only way to know is laboratory water testing. State water boards in affected areas (West Bengal, Bihar, UP) provide free arsenic testing. Alkin offers water quality testing in major cities. Home arsenic test kits (colorimetric kits) are available but less accurate than lab analysis — use them only as a preliminary indicator.
Can I cook with arsenic-contaminated water?
No. Cooking with arsenic-contaminated water is dangerous. Arsenic concentrates as water evaporates during cooking — boiling makes arsenic levels higher, not lower. Rice absorbs arsenic particularly efficiently. All water used for cooking, making tea, coffee, and food preparation must be purified. Use only RO purified water for all household water needs.
Does arsenic cause immediate symptoms?
Usually not. Chronic arsenic exposure from drinking water causes symptoms that develop over years — initially skin changes (dark spots, hardened patches), then systemic effects. By the time symptoms are visible, significant internal damage may already have occurred. This is why testing water before symptoms appear is critically important.

If you live in an arsenic-affected area, do not wait for symptoms. Install an Alkin RO water purifier immediately and schedule a water quality test. Contact Alkin for arsenic-specific water treatment recommendations for your region.

Share:

Ready to Experience Alkin Pure Water?

Call our water experts for a free demo and the right purifier for your family or business.

  Call 1800-180-2180 Shop Alkin Range