Environmental Protection Agency Office ot Pesticioes ana Toxic Substances Fall 1990 r/EPA National Pesticide Survey 4-Nitrophenol NO, 4-Nttroph«no4 What is 4-Nitro- phenol? How Does 4- Nrtrophenol Behave in Soil and Ground Water? How Doe* 4- Nftrophenol Get into Ground Water? The U.S. Environmental Protection Agency (EPA) has completed its five-year National Survey of Pesticides in Drinking Water Wells (NPS), a study of the presence of 127 pesticides, pesticide degradates, and nitrate in community water system (CWS) wells and rural domestic drinking water wells. 4-Nitrophenol, a component of ethyl and methyl parathion pesticides, was delected in the Survey. Because testing of 4- nitrophenol did not yield quantitative results, EPA does not have specific information about.the concentrations of this contaminant in drinking water wells. This fact sheet provides a description of 4-nitrophenol, its potential health effects, and guidance on both treating and preventing well contamination. 4-Nitrophenol is a degradation product of insecticides from the chemical famiry of mononitrophenols. 4-Nitrophenol was registered for use in 1948. Insecticides that produce 4-Nitrophenol include ethyl and methyl parathion. 4-Nitrophenol is used in a wide range of applications on many crops and against a variety of insects, such as aphids and mosquitoes. Pears and apples are some of the crops treated with parathion. The behavior of a pesticide after it is released to the environment is dependent upon its movement in air, water, and soil as well as the rate at which it is transformed, or broken down. Pesticides applied to crops or the soil surface may volatilize (vaporize) to the atmosphere, be carried off by surface runoff, be carried to ground water through leaching, or remain in the soil through adsorption (adherence) to soil particles and undergo little movement in air or water. Pesticides may be transformed by reaction with water, microorganisms, and exposure to sunlight. The likelihood that 4-ftftrophenol will migrate into ground water is influenced by its tendency to be transported (move) from soil to air and water and to be transformed by these various processes, as well as by the characteristics of the site, such as soil type, moisture, temperature, and depth to ground water. 4-Nitrophenol has a high potential to be transported, and a medium potential to be transformed. 4-Nitrophenol migration Into ground water could result from agricultural and other applications of parathion pesticides on cropped land. Other non-agricuituraJ applications of parathion pesticides may cause contamination in ground water. 4- Nitrophenol could also reach the soil from direct entry into a well through accidental «piiis or improper storage near a well. NPS 4-Nttmph9nol ------- Findings of the National Pesticide Survey What Health Effects Might be Caused by 4-Nttrophenol In Drinking Water? How is Water Treated to Remove Contami- nants? How Can Water Contamina- tion be Prevented? The presence of 4-nrtrophenol was detected in both CWS well and rural domestic well water samples. The analytical method selected for detecting the presence of 4-nitrophenol. is not reliable for measuring concentrations of 4-nitrophenol in water samples. Because the presence of 4-nrtrophenol cannot be confirmed with a high degree of confidence, national estimates for the number of wells containing 4- nitrophenot would be highly unreliable and therefore are not provided here. Non-Cancar Effects: EPA has set a Lifetime Health Advisory Level (HAL) for 4- nrtrophenol in drinking water at 60 ^g/L Lifetime HALs represent the concentration of a contaminant in water that may be consumed over an average human lifetime without causing adverse health effects. Lifetime HALs are based on health effects that were found in animals given high doses of the pesticides in laboratory studies. This level includes a margin of safety. Consuming 4-nitrophenol, however, at high levels well above the Lifetime Health Advisory Level over a long period of time has been shown to result in adverse health effects in animal studies, including damage to the liver, respiratory stress, and gastritis. Cancer R!*k: Data from laboratory studies are inadequate for EPA to determine if 4- nitrophenol can increase the risk of cancer in humans. Standard: EPA sets enforceable standards for public water systems, called Maximum Contaminant Levels (MCLs). These regulatory standards set achievable levels of drinking water quality to protect human health. EPA has not established a MCI for 4- nitrophenol, but plans to list 4-nitrophenol on the Drinking Water Priority List for future MCL consideration. 4-nitrophenol can be detected in drinking water by a laboratory using an EPA method such as #515.1. If 4-nitrophenol is detected in well water and confirmed by retesting to be above 60 pg/L State or County health officials should be consulted. They may advise periodic retesting to get an accurate overall picture of the water quality because changes in seasonal precipitation and changes in pesticide use can cause variations in the amount of chemicals found in water wells. They also may advise using an alternative drinking water supply (bottled water is an example of a temporary alternative), treating the water, or drilling a new or deeper well. If you receive your well water from a community water system, and are concerned about the quality of your water, contact your State public water supply agency. You may also be able to treat your well water to remove pesticides and other contaminants. Treatment by granular activated carbon adsorption can remove 4- nitrophenol from water. However, this technique is not necessarily appropriate or available in every situation. Your State or County health officials should be able to provide advice on the best approach to follow. Several steps may be taken to prevent pesticides or nitrate from entering wells, such as eliminating direct entry through the well wall, drilling a new well, or modifying or reducing pesticide and fertilizer use. Ellmlnata Direct Entry Through the Wall Wall If pesticides or nitrate are present in well water, they may be entering the ground water through the well itself rather than through the soil. If the well is old or poorty constructed, or if there are visible cracks in the well casing, obtain expert advice on whether or not improvements can be made to the well. In addition, investigate simple methods of capping the well or sealing it at the surface to prevent entry. Do not conduct any mixing activities near the well if you use well water to mix pesticides, because a spill could lead to direct contamination of the well. rtTS 4-Nttroph»nol ------- Drill a New Well Why was the National Pesticide Survey Conducted? Where to Go for More Information If the soil surrounding the well is the source of contamination, drilling a new or deeper well may make sense if water can be drawn from a deeper, uncontaminated aquifer. Unfortunately, it often is difficult to know the quality of the ground water without drilling or extensive testing. Seek expert advice before you drill. Learn More about Pesticide Ute If you use pesticides, whether for agricultural or home lawn and garden purposes, you should consider attending training courses given by your State or County agriculture department on how to reduce activities that can contaminate ground water. You may find that you can eliminate or lessen the frequency or quantity of your pesticide usage by choosing alternative methods of pest control. EPA conducted this survey to determine the frequency and concentration of pesticides, pesticide degradates, and nitrate in drinking water wells nationwide and to examine the relationship between the presence of pesticides in drinking water wells and patterns of pesticide use and ground-water vulnerability. The Survey sampled 566 community water system wells and 783 rural domestic wells for 127 pesticides, pesticide degradates, and nitrate. The wells were selected as a representative statistical sample to provide nationwide estimates of the presence of pesticides and nitrate in drinking water wells, and are not meant to provide an assessment of pesticide contamination at the iocal, County, or State level. This fact sheet is part of a series of NFS outreach materials, fact sheets and reports. The following additional fact sheets are available through EPA's Public Information Center (401 M Street SW, Washington, DC 20460, (202) 382-2080): Survey Design Survey Anttytes Quality Assurance/ Quality Control Analytical Methods Summary Results Fact Sheet for each detected analyte Project Summary Glossary How EPA Will Use The NPS Results Additional information on the Survey and on pesticides in general can be obtained from the following sources: U.S. EPA Safe Drinking Water Hotline 1-800-426-4791 (In Washington, DC (202) 382-5533) Monday-Friday, 8:30 am to 4:30 pm Eastern Time National Pesticide Telecommunications Network 1-800-858-7378 24 hours a day U.S. EPA Office of Pesticide Programs (OPP) Docket Public Information Branch (H7506C) 401 M Street, SW Washington, DC 20460 Telephone: (703) 557-2805 Information on regulation of pesticides in drinking water Information on health effects and safe handling of pesticides Background documents for Survey (available for review) NPS 4-NKmph»nol ------- National Technical Information Service (NT1S) Copies of the 5285 Port Royal Road . NFS Phase I Report Springfield, VA 22161 (available 1991) (703) 487-4650 and NPS Phase II Report (when available) If you are concerned about the presence of pesticides and nitrate in your private water well, contact your local or State health department. Other experts in your State environmental agency or agriculture and health departments may also be helpful to you. If you receive your drinking water from a community water system and have questions about your water quality, contact your local community water system owner/operator or the State water supply agency. Bibliography U.S. Environmental Protection Agency. Drinking Water Health Advisory. Pesticides. Michigan: Lewis Publishers, 1989. U.S. Environmental Protection Agency. Drinking Water Regulations and Health Advisories. April, 1990. U.S. Environmental Protection Agency. Health Advisory Summaries. January 1989. U.S. Environmental Protection Agency. Pesticides in Drinking Water Wells, September 1989. Worthing, Charles R., ed. The Pesticide Manual. 8th ed. Thornton Heath: The British Crop Protection Council, 1987. NPS 4-Nttrophinot ------- |