Location of Wells

PURPOSE: This rule sets criteria for water well placement. (1) High yield unconsolidated well location requirements are found in 10 CSR 23-3.010(F). All other well types shall be— (A) Located on a site that has sufficient surface drainage to prevent the accumulation or ponding of surface water within ten feet (10') of the well and, if possible, at a higher elevation than possible sources of contamination. The top of the casing shall extend a minimum of twelve inches (12") above ground surface; (B) Located a minimum setback distance from potential Pollution or Contamination Sources. See 10 CSR 23-3.010 Table 3.1 for specific distances to be followed; and (C) High yield unconsolidated wells shall be a minimum of two hundred feet (200') from contamination sources unless greater distances are specified in 10 CSR 23-3.010(1) Table 3.1. RESOURCES Table 3.1 Specific setback distances for wells from pollution or contamination sources. Feature requiring setback Minimum horizontal distance Storage area for commercial fertilizers or chemicals 300' Demolition landfill 300' Wastewater treatment plant or lagoon that serves commercial facilities, subdivisions, or mobile home parks 300' Above ground or underground storage tank1, 2 300' Tank distribution lines for liquid petroleum, petroleum products, or chemicals1, 2 300' Earthen, concrete, or other manure storage structures or lagoons 300' Land application areas for domestic or animal waste 300' Animal composting facilities 300' Unplugged abandoned wells 100' Subsurface wastewater disposal field, grave, residential lagoon, privy, lift station, or pressurized sewer line 100' Animal Feeding Operation (AFO)4 100' An animal composting facility constructed with a concrete floor cell design covered with a roof 100' Dry litter storage within a building 100' Other areas with contaminants that may leach into the groundwater 100' Septic tank or wastewater holding tank 50' Pit or cistern 50' Existing operating well 50' Non-pressurized buried sewer line 25' Solid waste disposal area, sanitary landfill, special waste landfill, utility waste landfill, waste stabilization pond (lagoon), or hazardous waste treatment, storage, or disposal facility3 1000' 1. Any well that cannot meet setback distances for petroleum distribution site shall meet the well construction requirements for a High Yield Bedrock well pursuant to 10 CSR 23-3.030(3). 2. Petroleum or petroleum products that are not liquid at standard temperatures and pressures are exempt from these setback requirements. 3. A safe distance cannot be determined. Any well that intercepts leachates from a waste landfill or waste stabilization pond (lagoon) shall be plugged unless it is approved by the department for use as a monitoring well. 4. Has the same meaning as defined in 10 CSR 20-6.300. AUTHORITY: sections 256.606 and 256.626, RSMo 2016.* Original rule filed April 2, 1987, effective July 27, 1987. Emergency amendment filed Nov. 16, 1993, effective Dec. 11, 1993, expired April 9, 1994. Amended: Filed Aug. 17, 1993, effective March 10, 1994. Amended: Filed Nov. 1, 1995, effective June 30, 1996. Amended: Filed June 27, 2018, effective Feb. 28, 2019. *Original authority: 256.606, RSMo 1991 and 256.626, RSMo 1985, amended 1991.