Bowers, F. H., 2000, "Septic system and nitrate nitrogen as indicators of groundwater quality trends in New Jersey", Dept. of Environ. Protec., New Jersey.
Charbeneau, R. J., 2006, Groundwater hydraluic and pollutant transport, Waveland Press, Translated by Ataie Ashtiani, N., and Ketabchi, H., Sharif University of Tech. Pub., Tehran. (In Persian)
Cimenti, M., Biswas, N., Bewtra, J.K. & Hubberstey, A., 2005, "Evalution of microbial indicators for the determination of bacterial groundwater contamination sources", Water, Air, and Soil Pollution, 168, 157-169.
Cool, G., Rodriguez, M. J., Bouchard, C., Levallois, P. & Joerin, F., 2010, "Evaluation of the vulnerability to contamination of drinking water systems for rural regions in Que´bec", Canada Journal of Environmental Planning and Management, 53, 615-638.
Council of the European Union, 1998, Council Directive 98/83/EC, on the Quality of Water Intended for human consumption, EU.
Federal Provincial Territorial Committee on Drinking Water, 2014, Guidelines for Canadian drinking water quality, Canada.
Fetouani, S., Sbaa, M., Vanclooster, M. & Bendra, B., 2008, "Assessing groundwater quality in the irrigated plain of Triffa. (North-east Morocco)", Agricultural Water Management, 95(2), 133-142.
Fetter, C.W., 1999, Contaminant hydrogeology, 2nd Ed., Prentice Hall Inc.
Fetter, C.W., 2001, Applied Hydrogeology, 3rd Ed, Macmillan Pub., New York.
Freeze, R. A. & Cherry, J. A., 1979, Groundwater, Prentice Hall, Englewood Cliffs, NJ.
Goulding, K., 2000, "Nitrate from arable and horticultural land", Soil and Management, 16, 145-151.
Helsel, D.R. & Hirsch, R. M., 2002, Statistical methods in water resources techniques of water resources investigations, Book 4, Chapter A3. U.S. Geological Survey, US Department of the Interior.
Hounslow, A.W., 1995, Water quality data: Analysis and interpretation, CRC Press.
Institute of Standards and Industrial Research of Iran, 2010, Drinking water physical and chemical specification, ISIRI. 1053, 5th revision. (In Persian)
Jiang, Y. & Somers, G., 2009, "Modeling effects of nitrate from non-point sources on groundwater quality in an agricultural watershed in Prince Edward Island, Canada", Hydrogeology Journal, 17, 707-724.
Joerin, F., Cool, G., Rod riguez, M.J. & Gignac, M., 2010, "Using multi-criteria decision analysis to assess the vulnerability of drinking water utilities", Environmental Monitoring and Assessment, 166, 313-330.
Jukar Nyasar, V. & Atai Ashtiani, B., 2006, "Modeling and stud of nitrate in Tehran unsaturatd speciimen combining the mass balance approach and focus parameters", Sharif Civil Engineering, 33, 3-11. (In Persian)
Kalantari, N., Rahimi, M.H. & Matoori, F., 2011, "Chemical and biological assessment of water resources of Sia-Mansour area, Dezful", Journal of Environmental Studies, 37 (59), 29-42.
Kenney, D.R., 1989, "The orogin of groundwater nitrate", Critcial Reviews in Environmental Science and Technology, 16 (3), 257-304
Kholghi, M., 2012, Workshop of mathematical models in groundwater management from theory to application, Water Institute of Tehran University, Tehran. (In Persian)
Khosravi Dehkordi, A., Afyuni, M. & Mosavi, F., 2006, "Groundwater around Zayanderoud river in Isfahan province", Journal of Environmental Studies,32 (39), 33-40. (In Persian)
Kumar, S.C. & Anderson, H.W., 1993, "Nitrogen isotopes as indicators of nitrate sources in Minnesota sand plane aquifers", Groundwater, 31, 260-271.
Latifi, M., Mousavi, S.F., Afyuni, M. & Velayati, S.A., 2005, "Investigation of nitrate pollution and sources in groundwater in Mashhad Plain”, Journal of Agriculture Sciences and Natural Resources, 12 (2), 21-32. (In Persian)
Lerner, D.N. & Papatolios, K.T., 1993, "A simple analytical approach for predicting nitrates concentration in pumped groundwater", Groundwater, 31(3), 370-376.
Lu, Y., Tang, Ch., Chen, J. & Sakura, Y., 2007, "Impact of septic tank system on local groundwater and water supply in Pearl River Delta, China: Case study", Hydrological Processes, 22, 443-450.
Lui, Z. J., Hallberg, G.R., Zimmerman, D.L. & Libra, R.D., 1997, "Detecting changes in the spatial distribution of nitrate concentration in groundwater", Journal of the American Water Resources Association, 33(6), 1209-1218.
Maila, Y.N., El-Nahal, I. & Al-Agha, M.R., 2004, "Seasonal variation and mechanisms of groundwater nitrate pollution in the Gaza Strip", Environment Geology, 47, 84-90.
Majudar, D. & Gupta, N., 2000, "Nitrate pollution of groundwater and associated human health disprders, Indian", Journal Environment Health, 42, 28-39.
Nasseri, H. R. & Alijani, F., 2002, Pollution sources of groundwater in Izeh Plain, North East of Khuzestan, Seputy of Research and Technical Affairs, Khuzestan Water and Power Authority. (In Persian)
Nasseri, H. R., Keyhomayoun, Z. & Nakhaee, M., 2015, "Simulation of nitrate transport in groundwater: Lenjanat Plain, Isfahan", Kharazmi Journal of Earth Sciences, 1(1), 89-106. (In Persian)
Obeidat, M.M., Massadeh, A.M., Al-Ajlouni, A.M. & Athamneh, F.S., 2007, "Analysis and evaluation of nitrate levels in groundwater at Al-Hashimiya area", Jordan. Environmental Monitoring and Assessment, 135 (1-3), 475-486.
Pacheco, J. & Cabrera, A., 1997, "Groundwater contamination by nitrates in the Yucatan Peninsula Mexico", Hydrology Journal, 5(2), 47-53.
Paul, M., Wolf, K., Funda, K., Held, I., Winter, J., Eiswirth, M., Gallert, C. & Hotzl, H., 2004, "Microbiological condition of urban groundwater in the vicinity of leaky sewer systems", Acta Hydrochemical Hydrobiology, 32, 351-360.
Petakove, N.I. & Ivanove, A.V., 1970, "Investigation of certain psycho physiological reaction in children suffering from metheamglobinaemia", Hyg. Sanit., 35, 29-32.
Qom Water and Wastewater Co., 2013, Chemical analysis of drinking wells in Qom, Qom Province Quality Lab., Qom.
Qom Water and Wastewater Co., 2013, Operation statistics, duty and responsibilityes of technical engineering and development deputy ship, Qom, Iran. (In Persian)
Shahsavandi, M., 2008, "The effect of urban sewage leakage on Qom drinking water wells", MSc Thesis, Dept. of Geology, Faculty of Earth Sciences, Shahid Behesthi University, Tehran. (In Persian)
Stamatis, G., Parpodis, K., Filintas, A. & Zagana, E., 2011, "Groundwater quality, nitrate pollution and irrigation environmental management in the Neogene sediments of an agricultural region in central Thessaly (Greece)", Environmental Earth Sciences, 64 (4), 1081-1105.
Tabatabaei, S. H., Khayat kholghi, M., Yarali, N. & Lalezari, R., 2009, "The effect of wastewater recharge on nitrate disturibution in shahrekord aquifer using MT3D Model", Reginal Water Company of Chaharmahal and Bakhtiyari Provinces, Shahrekord University, Shahrekord. Iran. (In Persian)
Todd, D.K. & Mays L.W., 2005, Groundwater hydrology, 3nd Ed., John Wiley and Sons Pub., N.Y.
U.S. EPA., 1993, Wellhead protection: A guide for small communities, Office of Research and Development Office of Water, Washington, DC, (EPA/625/R-93/002).
USEPA, 2009, Water standards and health advisories table, USA.
World Health Organization (WHO), 2011, Guidelines for drinking-water quality, 4th Ed., WHO, USA.
Zhang, H. & Hiscock, K.M., 2011, "Modelling the effect of forest cover in mitigating nitrate contamination of groundwater: A case study of the Sherwood Sandstone aquifer in the East Midlands", Journal of Hydrology, 34, 125-135.
Zheng, B. H., Fu, Q. & Liu, Y., 2007, "Environmental problems and solutions for public drinking water sources in china", Environmental Protection (Chinese), 381(19), 59-61.