05/06/2026
Drinking Water Quality & Health Risks: A Comprehensive Analysis
Water is life. Approximately 60-70 percent of the human body is water. We can survive for weeks without food, but only a few days without water. The quality of the water we drink every day directly determines our health, immunity, and long-term well-being.
In the context of Bangladesh, drinking water quality is a complex and urgent issue. On one hand, arsenic contamination of groundwater is among the most severe in the world. On the other hand, surface water has become polluted due to industrial waste, agricultural chemicals, and urban waste. Approximately 97 percent of people depend on groundwater, but how safe is that water?
This article discusses in detail the parameters that determine drinking water quality, various contaminants and their health effects, the reality in Bangladesh, and ways to ensure safe water.
1. Drinking Water Quality: Basic Parameters
According to the World Health Organization (WHO) guidelines, safe drinking water must meet the following characteristics.
1.1 Physical Parameters
pH:
¡ Standard value: 6.5â8.5
¡ Below pH 6.5: Water is acidic; metals leach from pipes into the water
¡ Above pH 8.5: Water is alkaline; taste may become bitter; disinfection is disrupted
Turbidity:
¡ Standard value: Below 5 NTU (ideal is 1 NTU)
¡ High turbidity: Indicates presence of mud, sand, or microorganisms
¡ Risk: Reduces disinfection effectiveness; increases risk of gastrointestinal diseases
Color and Odor:
¡ Standard: Colorless, odorless, tasteless
¡ Presence of color or odor indicates contamination
Temperature:
¡ Standard: 12â25°C
¡ High temperatures allow microorganisms to grow rapidly
1.2 Chemical Parameters
Total Dissolved Solids (TDS):
¡ Standard value: 500â1000 mg/L
¡ High TDS: Water tastes salty or metallic; risky for kidney patients
Hardness:
¡ Standard value: 100â300 mg/L (as calcium carbonate)
¡ High hardness: Soap lathers poorly, scale forms in pipes, causes hair and skin problems
Nitrate (NOâ):
¡ WHO standard: Below 50 mg/L
¡ Bangladesh standard: 10 mg/L (stricter)
¡ High nitrate: Causes 'blue baby syndrome' (impaired oxygen transport in blood) in infants
Nitrite (NOâ):
¡ WHO standard: Below 3 mg/L
¡ Bangladesh standard: 0.02 mg/L
¡ High nitrite: Cancer risk, methemoglobinemia
Fluoride:
¡ WHO standard: Up to 1.5 mg/L
¡ High fluoride: Dental fluorosis (yellow stains on teeth), bone problems
¡ Low fluoride: Risk of tooth decay
1.3 Heavy Metal Contaminants
¡ Arsenic (As): WHO standard 0.01 mg/L, Bangladesh standard 0.05 mg/L. Health risks include cancer, skin diseases, diabetes, heart disease.
¡ Lead (Pb): WHO standard 0.01 mg/L, Bangladesh standard 0.01 mg/L. Health risks include nerve damage, impaired brain development in children.
¡ Cadmium (Cd): WHO standard 0.003 mg/L, Bangladesh standard 0.005 mg/L. Health risks include kidney damage, brittle bones.
¡ Chromium (Crâļâē): WHO standard 0.05 mg/L, Bangladesh standard 0.05 mg/L. Health risks include skin ulcers, cancer.
¡ Mercury (Hg): WHO standard 0.001 mg/L, Bangladesh standard 0.001 mg/L. Health risks include nerve damage, developmental problems in children.
¡ Manganese (Mn): WHO standard 0.5 mg/L, Bangladesh standard 0.1 mg/L. Health risks include neurological problems (long-term).
1.4 Organic and Pesticide Contaminants
¡ Polychlorinated Biphenyls (PCBs): Cancer, immune system suppression
¡ Pesticides: Nerve damage, birth defects, cancer
¡ VOCs (Volatile Organic Compounds): Liver and kidney damage, cancer
1.5 Microbiological Parameters
¡ E. coli: Must be 0 CFU/100 mL
¡ Total coliform: 0 CFU/100 mL (ideal)
¡ F***l coliform: Presence confirms f***l contamination
A single drop of contaminated water can contain millions of bacteria, causing life-threatening diseases such as diarrhea, typhoid, cholera, and hepatitis A.
2. Major Drinking Water Contaminants and Their Health Risks
2.1 Arsenic: Bangladesh's Biggest Drinking Water Crisis
Bangladesh suffers from the most severe arsenic contamination in the world. In the 1970s, due to surface water pollution, approximately 10 million tube wells were installed across the country. Later, it was discovered that half of these tube wells contain arsenic levels far above the WHO standard of 10 Âĩg/Lâin some areas, up to 100 times higher.
Source of Arsenic:
¡ The sediments of the Ganges-Brahmaputra basin naturally contain arsenic
¡ As groundwater levels decline, water is being drawn from arsenic-rich layers
Affected Areas:
¡ Arsenic is present in 59 out of 64 districts
¡ Approximately 50 million people are at risk
¡ Chandpur, Cumilla, Feni, Noakhali, Sirajganj, Natore are the most affected
Health Risks of Arsenic:
Short-term (a few months):
¡ Stomach pain, nausea, diarrhea
¡ Tingling and numbness in hands and feet
Long-term (5-20 years):
¡ Melanosis: Dark spots on the skin
¡ Keratosis: Thickening and hardening of palms and soles
¡ Skin diseases: Sores, ulcers, itching
¡ Cancer: Risk of skin, lung, bladder, and liver cancer increases manifold
¡ Diabetes: Insulin secretion is disrupted
¡ Heart disease: Blood vessels are damaged
¡ Neurological problems: Memory loss, paralysis
¡ Reproductive problems: Miscarriage, developmental defects in children
Arsenic poisoning is often called a "silent epidemic" because symptoms appear gradually, and people often do not realize that their water is killing them.
2.2 Bacteria and Microbiological Contamination
Surface water and shallow tube well water are frequently contaminated with f***l matter.
Pesticide and Chemical Contamination:
¡ Toxic agricultural chemicals seep through soil into water
¡ Neurotoxic effects (nerve damage)
¡ Endocrine disruptors (hormonal problems)
Major Diseases:
¡ Diarrhea: The second leading cause of death in children under 5 worldwide
¡ Cholera: Severe dehydration; can cause death within 24 hours without treatment
¡ Typhoid: High fever, weakness, intestinal problems
¡ Hepatitis A: Liver inflammation, jaundice
¡ Polio: Nerve damage, paralysis
Eighty percent of tube wells in rural Bangladesh have been found to contain bacteria at some point.
2.3 Nitrate Contamination
Due to excessive fertilizer use, nitrate levels in groundwater are increasing.
Health Risks:
¡ Blue Baby Syndrome (Methemoglobinemia): Reduced oxygen transport capacity in infant blood; skin turns blue
¡ Cancer: Increased risk of stomach and esophageal cancer
¡ Thyroid problems: Impaired iodine absorption
¡ Increased risk of miscarriage
Children and pregnant women are at highest risk.
2.4 Lead Contamination
Old pipelines, old brass faucets, and some bottled water may contain lead.
Health Risks (most dangerous for children):
¡ Reduced IQ: Lead destroys brain development in children
¡ Behavioral problems: Hyperactivity, attention deficit
¡ Hearing loss
¡ Anemia
¡ Kidney damage
¡ High blood pressure and reproductive problems in adults
There is no safe level of leadâno matter how small the amount, it is harmful.
2.5 Hardness and Scale
Excess calcium and magnesium:
Health Risks:
¡ Increased risk of kidney stones (if predisposed)
¡ Hair and skin problems: Dry hair, itchy skin
¡ Scale buildup when boiling water reduces the lifespan of geysers and kettles
2.6 Chlorine and Disinfection Byproducts
Chlorine is used to disinfect city water. Chlorine reacts with organic matter in water to form cancer-causing compounds called trihalomethanes (THMs) .
Health Risks:
¡ Bladder cancer
¡ Colorectal cancer
¡ Miscarriage and birth defects (with high exposure during pregnancy)
2.7 Plastic and Microplastics
Microplastics can leach into water from bottled water and plastic pipelines.
Health Risks (under research):
¡ Intestinal inflammation
¡ Hormonal problems
¡ Can transport toxic chemicals through the body
3. Reality in the Bangladesh Context
3.1 Groundwater vs. Surface Water
Approximately 97 percent of people in Bangladesh depend on groundwater, because river, canal, and pond water are polluted.
Groundwater Problems:
¡ Arsenic: 20-30 percent of tube wells exceed WHO standards
¡ Salinity: Widespread problem in coastal areas
¡ Iron: Water in many areas has a reddish tint; not a major health risk but affects taste and appearance
Surface Water Problems:
¡ Rivers, canals, and ponds are extensively polluted
¡ Rivers around DhakaâBuriganga, Turag, Balu, Sh*talakshyaâare now 'lifeless'
3.2 Urban vs. Rural Differences
Dhaka City:
¡ Water comes from groundwater sources (940 deep tube wells)
¡ WASA disinfects with chlorine
¡ Occasional f***l contamination occurs in old pipelines
¡ Dependence on bottled water is increasing
Rural Areas:
¡ Shallow tube wells are the main source
¡ Arsenic and bacterial problems are more severe
¡ Fewer opportunities to ensure hygienic water
4. How to Ensure Safe Drinking Water
4.1 Household Water Purification Methods
Boiling:
¡ Best and easiest method
¡ Boiling for 1 minute kills bacteria and viruses
¡ Does not remove arsenic or metal contamination
¡ Requires fuel
Bleaching (Chlorination):
¡ Adding one drop of bleaching powder or liquid chlorine to 10 liters of water kills germs
¡ Maintaining the correct dosage is important
¡ Does not remove arsenic
Solar Disinfection (SODIS):
¡ Filling PET bottles with water and leaving them in sunlight for 6 hours kills germs with UV rays
¡ Does not work on cloudy days
¡ Does not remove arsenic
Sand and Charcoal Filters:
¡ Remove mud and large particles
¡ Do not remove bacteria or arsenic
4.2 Advanced Purification Technologies
Arsenic Removal Filters:
¡ Various technologies have been developed in Bangladesh (Sono filter, Read filter, Alkaline filter)
¡ Remove both iron and arsenic
¡ Require regular maintenance
Reverse Osmosis (RO):
¡ Most effective technology
¡ Removes arsenic, lead, bacteria, and salt
¡ Expensive, consumes electricity and wastes water
Activated Carbon Filters:
¡ Remove taste, odor, chlorine, and some organic contaminants
¡ Do not remove bacteria or metal contamination
4.3 Tube Well Selection and Maintenance
¡ Test water before installing a tube well
¡ Maintain minimum distance from sanitary latrines and chemical warehouses
¡ Test the tube well every six months
¡ Keep the tube well platform clean; do not stand on it while drawing water
4.4 Precautions for Choosing Bottled Water
¡ Check the expiration date
¡ Take sealed bottles
¡ Check whether the water is purified (look for 'purified' or 'mineral' labels)
¡ Choose reliable companies
¡ Do not reuse bottles (bacteria grow inside)
5. Conclusion: Drink Safe Water to Stay Healthy
The quality of your drinking water directly determines your health and the health of your family. In Bangladesh, the main risks to water are arsenic, bacteria, nitrate, and lead contamination.
Remember:
¡ Water that looks clean is not necessarily safe
¡ Boiling kills bacteria but does not remove arsenic
¡ Special filters are required to remove arsenic
What You Should Do:
¡ Get your water source tested (at a government laboratory)
¡ Use the correct filter
¡ Disinfect water by boiling or using chlorine
¡ Take extra precautions for children and women.
