BMC proposes conservancy and sewage charge based on annual value of properties in all its 41 wards March 8, 2024 | Key Segments, Municipal Wastewater, News & Developments, Tariffs & Charges, Wastewater Bidhannagar Municipal corporation has proposed 1 per cent conservancy charge and 0.7 per cent sewage charge based on the annual value of properties in all its 41 wards. This content is restricted.