{"references": ["Letter from Ohio Department of Health to All Certified Bacteriological Laboratories. July 30, 1987. Contains bacteriological standards for public and private water supplies.", "Lehr, J.H. 1989. Factual, Fictional, and Ethical Impacts on Ground-Water Contamination in the United States. Ground Water 27:2-11.", "Conservation Foundation. 1987. State of the Environment: A View Toward the Nineties. Washington D.C.", "State of Ohio. 1986. Ohio Ground Water Protection and Management Strategy. Columbus, Ohio: Ohio Environmental Protection Agency. 67 p.", "Ohio Environmental Council. 1986. Buried Treasure at Risk: A Strategy to Protect Ohio's Groundwater. Executive Summary. Columbus, Ohio. 26 p.", "Freshwater Foundation. 1987. Agricultural Chemicals and Groundwater Protection: Suggested Directions for Consideration and Action. Recommendations from the conference. Agricultural Chemicals and Groundwater Protection: Emerging Management and Policy, St. Paul, MN. 10 p.", "Nielsen, E.G. and L.K. Lee. 1987. The Magnitude and Costs of Groundwater Contamination From Agricultural Chemicals: A National Perspective. Washington D.C.: U.S. Department of Agriculture, Economic Research Service. 54 p.", "League of Women Voters Education Fund. 1987. Safety on Tap: A Citizen's Drinking Water Handbook. Washington D.C.: League of Women Voters of the U.S. Publication 840. 68 p.", "Environmental Protection Agency. 1988. National Primary Drinking Water Regulations; (and following editions). 40 CFR Parts 141 and 142. Washington D.C.: EPA Office of Water.", "Mancl, K. 1987. Nitrate in Drinking Water. Columbus, Ohio: The Ohio State University, Cooperative Extension Service. Bulletin 744. 7 p.", "Environmental Protection Agency. 1987. National Pesticide Survey: Summary of Statistical Design. Washington D.C.: U.S. Environmental Protection Agency. Publication DU-87-A194.", "Madison, R.J. and J.O. Brunett. 1984. Overview of the Occurrence of Nitrate in Ground Water of the United States. U.S. Geological Survey, National Water Summary 1984 -- Water-Quality Issues pp. 93-105.", "Francis, J.D., et al. National Statistical Assessment of Rural Water Conditions - Executive Summary. Department of Rural Sociology, Cornell University, Ithaca, NY. Report prepared for the Office of Drinking Water, U. S. Environmental Protection Agency. 21 p.", "Hallberg, G.R. 1986. \"Nitrates in Iowa Groundwater\". Chapter 3 In: Rural Groundwater Contamination. D'Itri, F.M. and Wolfson, L.G. Chelsea, MI: Lewis Publishers, Inc.", "Aller, L., T. Bennett, J. Lehr, R. Petty, and G. Hackett. 1987. DRASTIC: A standardized system for evaluating ground water pollution potential using hydrogeologic settings. U.S. Environmental Protection Agency. EPA/600/2-87/035. Dublin, Ohio: National Well Water Association.", "Alexander, W.J., S.K. Liddle, R.E. Mason, and W.B. Yeager. 1985. Ground-water vulnerability assessment in support of the first stage of the National Pesticide Survey. Prepared for the U.S. Environmental Protection Agency, contract no. 68-01-6646. Research Triangle Park, North Carolina: Research Triangle Institute.", "Ohio Department of Natural Resources, Division of Water Programs. Miscellaneous publication. Columbus, Ohio.", "Letter from Bradley Ross, District Administrator for Knox Soil and Water Conservation District to David B. Baker, Director Water Quality Laboratory. May 9, 1989.", "U.S. Environmental Protection Agency. 1989. Drinking Water Regulations and Health Advisories. (Draft 4/5/89). Washington D.C.: U.S. EPA, Office of Drinking Water.", "Barrett, M.R. and W.M. Williams. 1989. The Occurrence of Atrazine in Ground Water as a Result of Agricultural Use. In Proceedings from national conference, Pesticides in Terrestrial and Aquatic Environments. Blacksburg, Virginia. In press.", "LeMasters, G. and D.J. Doyle. 1989. Grade A Dairy Farm Well Water Quality Survey. Madison, WI. 36 p.", "Baker, D.B. and R.P. Richards. 1989. Herbicide Concentration Patterns in Rivers Draining Intensively Cultivated Farmlands of Northwestern Ohio. In Proceedings from national conference, Pesticides in Terrestrial and Aquatic Environments. Blacksburg, Virginia. In press.", "Letter and report from Andrew J. Klein, Monsanto Agricultural Company, to Robert Wulfhorst, Ohio Department of Agriculture. April 19, 1988.", "Ohio Environmental Protection Agency. 1988. Environment Ohio, Volume 2, Issue 4.", "Ohio Department of Agriculture. ODA Pesticides in Groundwater Survey (Preliminary Summary). Reynoldsburg, Ohio.", "Miltner, R.J., D.B. Baker, T.S. Speth, and C.A. Fronk. 1989. Treatment of Seasonal Pesticides in Surface Waters. American Water Works Association Journal 81:43-52.", "Richards, R.P. and D.B. Baker. 1989. Potential for Reducing Human Exposures to Herbicides by Selective Treatment of Storm Runoff Water at Municipal Water Supplies. In Proceedings from national conference, Pesticides in Terrestrial and Aquatic Environments. Blacksburg, Virginia. In press.", "Lane, R.I. 1989. Effects of Domestic Sewage on Ground-water Quality in Two Subdivision, Coshocton County, Ohio. Columbus, Ohio: Department of Health.", "U.S. Environmental Protection Agency. March 31, 1987. Health Advisory: Nitrate/Nitrite. U.S. EPA, Office of Drinking Water. 18 p.", "Ohio Department of Natural Resources. 1988. Ohio Nonpoint Source Management Program. Columbus, Ohio. 545 p.", "Soil and Water Conservation Society. A Guide for Safe, Profitable Fertilizer and Pesticide Use From SWCS. Ankeny, Iowa.", "McKenna, D.P., S.F.J. Chou, R.A. Grifin, J. Valkenburg, L.L. Spencer, and J.L. Gilkeson. 1988. Assessment of the Occurrence of Agricultural Chemicals in Groundwater in a Part of Mason County, Illinois. Proceedings of a Conference, March 1988. Dublin, Ohio: National Water Well Association. pp. 389-406.", "Klaseus, T. 1987. Minnesota Pesticide Monitoring Surveys: Interim Report. Proceedings of a Conference, October 1986. Pesticides and Groundwater: A Health Concern for the Midwest. Navarre, Minnesota: Freshwater Foundation. pp. 137-160.", "U.S. Environmental Protection Agency. September 1987. Health Advisory: Atrazine. U.S. EPA, Office of Drinking Water. 21 p.", "U.S. Environmental Protection Agency. March 31, 1987. Health Advisory: Alachlor. U.S. EPA, Office of Drinking Water. 15 p."]}

ACKNOWLEDGMENTS In 1988, the George Gund Foundation of Cleveland, Ohio provided a grant to the Heidelberg College Water Quality Laboratory to operate an "environmental extension program" in association with our studies of agrichemical contamination of private rural wells in Ohio. This atlas represents one of the products of that environmental extension program. The data contained in this atlas were produced through the cooperative efforts of local organizations in 76 Ohio counties, more than 16,000 Ohio residents, and the Water Quality Laboratory of Heidelberg College. In particular, the efforts of state and county Farm Bureau staff, Soil and Water Conservation Districts, and Cooperative Extension Agents in organizing the county well water testing programs were essential to this program. The efforts of individual participants in picking up and delivering their sampling materials at central locations in each county were also essential to the program. By accomplishing the sample collection portion of the study, each well owner contributed much more than just the $1.00 fee and a water sample. Financial support to the Water Quality Laboratory for the analytical and interpretive portions of this program also reflected cooperative efforts. A 1986 grant received from the State of Ohio, and administered by the Ohio Department of Natural Resources' Division of Soil and Water Conservation, provided the base support. Additional support to our program by industries (American Cyanamid, Ciba-Geigy, Dow Chemical, DuPont, Hoechst-Roussel, Monsanto, Proctor and Gamble, Rhone-Poulenc, and Terra International) and by foundations (The Anderson Foundation of Toledo and the Toledo Community Foundation) enabled us to expand these efforts from a local to a state level. Valuable technical assistance during the design and operation of this program was offered by staff of Ohio Department of Natural Resources (ODNR), the Ohio Environmental Protection Agency (OEPA), the Ohio Department of Health, and the Ohio Department of Agriculture. Martin Williams of the U. S. EPA, Office of Pesticide Programs provided county-level DRASTIC indices for Ohio counties. Helpful review comments on partial drafts of the atlas were received from numerous state agency personnel, including Jerry Wager, Dan Kush, and Rebecca Petty from ODNR; Scott Golden from the Ohio Department of Health; and Carl Wilhelm, Ed Armstrong, and Gary Martin from the OEPA. Additional reviews were provided by Karen Mancl of The Ohio State University Cooperative Extension Service; Bob Burris of the Soil Conservation Service; Callie Childress, Donna Myers, and Mike Eberle of the U. S. Geological Survey; Bradley Ross of the Knox County Soil and Water Conservation District; and Bob Bash of the Farm Bureau. This work capitalized on the high capacity, efficient, and highly automated analytical laboratory of the Water Quality Laboratory. This analytical laboratory has been developed by Jack Kramer (Laboratory Manager) with assistance from Ellen Ewing (Chief Technician), and Barbara Merryfield (Autoanalyzer Technician). The work of June Huss (WQL secretary) in entering most of the data into the computer from the participant information sheets is also greatly appreciated. Steve Eshelman, a geology graduate student from the University of Toledo, helped in encoding well coordinates for several counties. Finally, numerous WQL student assistants from Heidelberg College helped in various portions of this work.