1. Anonymous (2002) Heavy metals in waste, Final Report, European Commission DG ENV. E3, Project ENV.E.3/ETU/2000/0058
2. APHA (1995) Standards methods for the examination of water and wastewater, 19th edn. American Public Health Association, Washington
3. BIS (1991) Drinking water specifications. Bureau of Indian Standards, IS: 10500
4. CGWB (2008) Groundwater information booklet of Thiruvananthapuram district, Kerala State, Central Ground Water Board
5. Chithra VS, Jaya DS (2005) Phytoremediation of sewage by grass cultivation: a case study of Valiathura sewage farm in Trivandrum district, Kerala. Asian J Microbiol Biotechnol Environ Sci 7(4):693–698