Faecal coliform in Puducherry's Thengaithittu, Kuruchikuppam beaches exceeds safe limits
The Puducherry Pollution Control Committee (PPCC) said the water samples collected from Thengaithittu beach, Kuruchikuppam beach and Kalapet beach in January, July and October 2024 showed high levels of faecal coliform at 1600 MPN/100 ml, which is far exceeding the permissible limit of 100 MPN/100 ml. MPN is Most Probable Number, an estimation used to measure microorganisms in water.
Kuruchikuppam beach recorded the highest level of faecal coliform at 1600 MPN/100 ml in January, followed by Thengaithittu beach and Kalapet beach with levels of 800 MPN/100 ml during the same period.
PPCC said the water level in three beaches did not comply with the Central norms of Class SW-II water - 100 MPN/100 ml (for bathing, water sports and commercial fishing). PPCC attributed the high levels of contamination due to release of untreated sewage into the beaches.
According to N. Ramesh, Member Secretary of PPCC, 'Four Sewage Treatment Plants (STPs) with varying capacities will soon be installed to improve the water quality and bring down the levels of faecal coliform. The establishment of 15 MLD STP at Dubrayapet and 11 MLD STP at Karaikal is nearing completion. The PPCC has also readied an action plan for restoration of polluted river stretches in Puducherry and Karaikal while a 3 MLD STP with Faecal Sludge Treatment plant has been planned near the Sankaraparani river in Puducherry.
The Biological Oxygen Demand at Chunnambar stood at 9.4 mg/litre, 7.2 mg/litre in Kanagan lake and 8.8 mg/litre in Arasalar lake as against the standard 3 mg/litre.
PPCC said the primary reason for contamination is the unchecked flow of untreated sewage from residential areas, which continued to affect the waterbodies.
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