The Kolkata Municipal Corporation supplies the city with potable water that is sourced from the Hooghly River;[148] most of it is treated and purified at the Palta pumping station located in North 24 Parganas district.[149][failed verification] Roughly 95% of the 4,000 tonnes of refuse produced daily by the city is transported to the dumping grounds in Dhapa, which is east of the town.[150][151] To promote the recycling of garbage and sewer water, agriculture is encouraged on the dumping grounds.[152] Parts of the city lack proper sewerage, leading to unsanitary methods of waste disposal.[81]