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Last Updated:: 02/02/2012
National status of waste water generation & treatment
As per the latest estimate out of 22,900 Mld of wastewater generated in the country, only about 5900 Mld (26%) is treated before letting out, the rest i.e., 17000 Mld is disposed of untreated. Twenty seven cities have only primary treatment facilities and forty-nine have primary and secondary treatment facilities. The level of treatment available in cities with existing treatment plant varies from 2.5% to 89% of the sewage generated.
The total wastewater generated by the 299 class I cities is 16,662 Mld approximately 81% of the water supplied. The state of Maharashtra alone contributes about 23%, while Ganga river basin contributes about 31% of the waste generated. Only 74% of the total wastewater generated is collected. Out of 299 class I cities 160 cities have sewerage coverage for more than 75% of the population and 92 cities have between 50 and 75% of population coverage. On the whole 70% of the population of class I cities are provided with sewerage facility. The type of sewerage system is either open or closed or piped.
Source: Status of sewage treatment plants in Ganga Basin, CPCB Publication, June 2003