Why Contaminated Water Is So Often Overlooked
Waterborne illness is one of the most underdiagnosed health problems in Bangladesh. When a family member has recurring stomach problems, headaches or skin issues, contaminated drinking water is rarely the first suspect. Doctors treat the symptoms — upset stomach, fatigue, rashes — without testing the environmental cause. Meanwhile, the family continues drinking the same water every day.
This is not a rare edge case. Water contamination in Bangladesh is documented extensively: arsenic affects millions of groundwater users across dozens of districts, microbial contamination is widespread in urban pipe networks, and chemical pollutants from agriculture and industry enter water sources across the country.
Warning Sign 1 — Recurring Gastrointestinal Problems
If one or more family members experience frequent diarrhoea, nausea, stomach cramps or vomiting that does not have an obvious food cause, contaminated water is a leading suspect. Bacterial contamination — E. coli, Salmonella, Campylobacter — causes acute gastrointestinal illness. Protozoa like Giardia cause chronic symptoms that come and go over weeks or months.
What to do: Stop drinking unfiltered tap water immediately. Get a basic water quality test from your local water authority or a private lab. Meanwhile, boil all drinking water or use bottled water until you have a functioning purifier installed.
Warning Sign 2 — Skin Rashes or Irritation After Bathing
High levels of chlorine, chloramine or industrial chemicals in water cause skin dryness, rashes and irritation — particularly in children and people with eczema or sensitive skin. If skin problems worsen or appear after moving to a new home or after a change in the municipal supply, your water is a likely cause.
What to do: A whole-house carbon filter reduces chlorine and chloramines at the point of entry before water reaches your shower and taps.
Warning Sign 3 — Hair Loss or Brittle Hair
Hard water — water with high calcium and magnesium content — coats hair follicles and disrupts the scalp's natural pH balance. Excessive minerals cause hair to become brittle, break easily and eventually thin. This is particularly common in Dhaka and Chittagong where groundwater hardness is elevated.
What to do: A water softener or a shower filter with a KDF media removes excess minerals at the point of use.
Warning Sign 4 — Discoloured or Strange-Tasting Water
- Yellow or brown tint — rust from aging iron pipes or elevated iron in groundwater
- Cloudy or milky appearance — suspended particles, high turbidity, or dissolved gases
- Rotten egg smell — hydrogen sulphide gas, common in deep wells and some groundwater sources
- Strong chlorine taste — excess chlorination by the municipal supply
- Salty or brackish taste — high TDS or saline intrusion, common in coastal districts
None of these are merely aesthetic — each signals a specific contamination problem that requires a targeted treatment solution.
Warning Sign 5 — Scale Buildup on Appliances and Fixtures
White or grey mineral deposits on taps, inside kettles, on shower screens and on pots are a visual signal of hard water. While scale itself is not directly harmful to drink, it indicates very high mineral content — and the same minerals are depositing inside your pipes and water heater, reducing their lifespan significantly.
What to do: A TDS meter will confirm hardness. If TDS is above 500 ppm with visible scaling, an RO system or water softener is warranted.
Warning Sign 6 — Children Performing Below Potential at School
This is the most serious and least discussed warning sign. Chronic low-level arsenic exposure causes cognitive impairment in children — reduced IQ, attention difficulties and learning delays. Arsenic is odourless, colourless and tasteless. A family living in an arsenic-affected district and drinking unfiltered groundwater may not know their water is contaminated without a test. The Bangladeshi districts with documented arsenic contamination include significant portions of Barisal, Khulna, Faridpur, Comilla, Munshiganj, Noakhali and others.
What to do: If you are in or near an arsenic-affected district, get your water tested for arsenic specifically — a TDS meter will not detect it. Install an RO system immediately if arsenic is confirmed.
Warning Sign 7 — Frequent Eye or Ear Infections in Children
Microbially contaminated water used for washing faces, bathing or inadvertently swallowed during baths is a common cause of recurrent eye infections (conjunctivitis) and ear infections in young children. If a child has repeated infections without clear cause, the household water supply deserves investigation.
What to Do: A Step-by-Step Response
- Test your water — start with a TDS meter for minerals, then get a lab test for bacteria and arsenic if you suspect them
- Stop using unfiltered water for drinking and cooking immediately — use boiled or bottled water while you investigate
- Match the treatment to your contamination — do not guess based on brand names
- Install the correct purifier — RO for chemical/TDS/arsenic issues, UV for microbial risk, UF for particle and bacteria removal without electricity
- Test your purified water — verify the purifier is working correctly with a TDS meter; for bacteria and arsenic, retest with a lab
Your water is a daily health decision. The cost of a quality purifier is small compared to the long-term health consequences of chronic contaminated water exposure.