Faecal contamination exceeded the maximum permissible limits along the four monitoring stations on the Periyar in Ernakulam from April 2025 to June 2025.
The total coliform count, indicating faecal contamination, recorded at the sewage discharge point in Aluva was 70,000 MPN (most probable number) per 100 ml, according to the test results compiled by the Kerala State Pollution Control Board. The maximum permissible limit of total coliform in bathing water, as prescribed by the Central Pollution Control Board (CPCB), is less than 2,500 MPN per 100 ml.
