P. K. Gupta, “Pesticide Exposure–Indian Scene,” El-Sevier Ireland Ltd, 2004.
 N. Sankaramakrishnan, A. K. Sharma and R. Sanghi, “Organochlorine and organophosphorous pesticides resi-dues in groundwater and surface waters of Kanpur,” Uttar Pradesh, India. Environment International, Vol. 31, pp. 113–120, 2005.
 IARC, “Occupational exposure in insecticide application, and some pesticides,” International Agency for Research on Cancer, Lyon, (IARC monographs on the evaluation of Carcinogenic Risks to humans, v-53), 1991.
 V. K. Dua, R. Kumari, V. P. Sharma and S. K. Subbarao, “Organochlorine residues in human blood from Nainital (UP),” India. Bull Environ Contam Toxicol, Vol. 67, pp. 42–45, 2001.
 UNEP, “Global report on regionally based assessment of persistent toxic substances,” UNEP Chemicals. Geneva, Switzarland, 2003.
 K. P. Singh, A. Malik, D. Mohan and S. Sinha, “Persis-tant organochlorine pesticide residue in alluvial ground-water aquifers of Ganga Plain,” India. Bull Env Cont Toxico, 2005.
 S. P. Mohapatra, M. Kumar, V. T. Gajbhiye and N. P. Agnihotri, “Groundwater contamination by organochlo-rine insecticide residues in a rural area in the Indo-Gangetic Plain,” Environ Mon Assess, Vol. 35, pp. 155–164, 1995.
 S. Kumar, K. P. Singh and K. Gopal, “Organochlorine residues in rural drinking water sources of Northern and North Eastern India,” J Envirnon Sci Health, Vol. 30, pp. 1211–1222, 1995.
 R. Sanghi and K. S. Sasi, “Pesticides and heavy metals in agricultural soil of Kanpur,” India. Bull Environ Contam Toxicol, Vol. 67, pp. 446–454, 2001.
 R. P. Singh, “Comparison of organochlorine pesticide levels in soil and groundwater of Agra,” India. Bull En-virno Contam Toxicol, Vol. 67, pp. 126–132, 2001.
 G. C. Chatterjee, A. B. Biswas, S. Basu and B. N. Niyogi, “Geology and groundwater resources of the greater Cal-cutta Metropolitan area,” West Bengal, Bull Geol Surv India, Ser B No21, pp.150, 1964.
 A. B. Biswas and A. K. Saha, “Environmental hazards of the recession of piezometric surface of groundwater un-der Calcutta,” Proc. Ind Nat Sc Aca, Vol. 51, No. 3, pp. 610–621, 1985.
 P. K Sikdar, “Geology of the Quaternary aquifers of the twin city of Calcutta-Howra,” Jour Geol Soc Ind, Vol. 56, pp. 169–181, 2001.
 A. B. Biswas, “Water supply in Calcutta ‘Calcutta, the Live City’ v.2, ed. Sukanata Choudhury,” Oxford Uni-versity Press, Kolkata, pp. 160–166, 1990.
 N. C Ghose, T. K. Chatterjee, A. Gupta and Saha. Di-pankar “Heavy metal concentration in groundwater of Greater Calcutta (Kolkata),” West Bengal, India. Indian Jour. Geol. Vol. 73, pp. 55–56, 2001.
 BIS, “Drinking water quality standards. Bureau of Indian Standards,” No. 10500, New Delhi, India, 1991.
 APHA, “Standard method for the examination of water and wastewater,” American Public Health Association, New York, 1984.
 AOAC, “Official methods of analysis of the association of official analytical chemists. 16th Ed. Cunniff P (ed.),” 1995.
 W. Fresenius, K. E. Quentime and W. Schneider, “Water analysis,” Springer Verlag, Berlin, pp. 804, 1988.
 H. P. Ciuetha and K. T. Dood, “The determination of the irritancy potential of surfactants using various methods of assessment,” Drug Chem. Toxocol, Vol. 3, pp. 305–324, 1978.
 WHO, “Drinking water standards,” World Health Or-ganisation, Geneva, 1993.
 G. M. Rand, P.G. Wells and L. S. McLarti, “Introduction to acquatic toxicology,” In. Rand GM ed., Tailor & Fran-cis, 1995.
 A. C. Belfroid, M. van Drunen, M. A. Beck, S. M. Schrap, C. A. M. van Gestel and B. van Hattum, “Relative risk of transformation products of pesticides for aquatic ecosys-tem,” Sci Total Environ, Vol. 222, pp.167–183, 1998.
 EEC directive, Europian Economic Commission directive 3-76/464/EEC; EUROPA, 1980.
 M. Dutta and K. S. Schafer, Lindane, International POP Estimation Network,” www.ipen.org, 2003.
 S. C. Mathur, “Pesticide industry in India,” Pestic Inf XXIII, Vol. 4, pp. 17–29, 1998.