Afer realizing demanding of conduit water in Kathmandu valley, government had established a systematic development of water supply system with the PANI ADDA (PANI GOSWARA) unit in 2029 B.S. (May 1973A.D.).His Majestry's Government of Nepal had developed Nepal Water Supply Corporation (NSSC) Act, in Feburary,1990. Under this act NWSC has blooming drinking water supply services in twenty three urban ares in different part of country.
According to NWSC Act 1990 the Corporation shall get its annual accounts audited by a certified auditor (Chartered Accountant) appointed by the office of the Auditor General.
The government of Nepal had developed a PPP(Public Private Partnership) concept for delivering water supply services to the consumer by handeling over water supply scheme to the local Board in 2005(A.D.). Under this policy The Kathmandu Valley Water Supply System has been functioning under PPP concept since last three years. Similarly Bharatpur and Hetauda water supply systems are in under process.