When summer arrives and municipal taps run dry, housing societies purchase hundreds of private water tankers. But without laboratory chemical and biological testing, sewage-contaminated water gets pumped directly into underground domestic sumps, triggering acute jaundice and typhoid outbreaks.
Statutory Drinking Water Standards: BIS 10500
Water supplied to residential flats must conform to Bureau of Indian Standards (IS 10500:2012) drinking water specifications:
Total Dissolved Solids (TDS) should stay below 500 mg/L (acceptable limit), Total Hardness below 200 mg/L, and most critically: E. Coli and Coliform bacteria must be absolutely zero in any 100 ml sample.
- Conduct unannounced monthly microbiological and chemical laboratory water tests from overhead and kitchen taps.
- Check tanker driver delivery sources: water harvested from industrial contaminated borewells contains toxic heavy metals (arsenic, lead) that basic RO filters cannot remove.
- Verify tanker interior cleanliness: tankers must be lined with food-grade epoxy coating.
The 6-Stage Mechanized Tank Cleaning Process
Draining tanks and having an untrained laborer sweep the floor with a dirty broom is ineffective and dangerous. Professional societies mandate a 6-stage mechanized cleaning protocol every 6 months:
- 1. Dewatering using high-flow submersible sludge pumps.
- 2. High-Pressure Rotary Jet Cleaning to strip calcified algae and biological slime.
- 3. Industrial Vacuum Slurry Pumping to extract heavy silt.
- 4. Anti-bacterial chemical scrub using food-grade hydrogen peroxide solutions.
- 5. High-intensity Ultraviolet (UV) disinfection to kill residual airborne spores.
- 6. Formal water testing certification before refilling.
Common questions
How often should housing society overhead and underground tanks be cleaned?
Municipal health guidelines mandate deep mechanized cleaning at least twice a year (typically pre-monsoon and post-monsoon), with water test certificates displayed on community boards.
Related DGate resources for society management
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- RWA management software for managing committees
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