Illinois Administrative Code › Title 77 - PUBLIC HEALTH › Part 920 - WATER WELL CONSTRUCTION CODE › Section 920.50 - Location

Current through Register Vol. 48, No. 28, July 12, 2024
a) General. In
			 establishing the location of a well, the constructor shall consider sources of
			 contamination that exist on or adjacent to the location of the well. As far as
			 possible, the well shall be located on ground that is higher than sources of
			 contamination and shall have ready access for repairs, maintenance, treatment
			 and inspection. All water wells, except monitoring wells, shall be located in
			 accordance with the minimum distances specified in Table C and shall be
			 constructed in accordance with this Part.
b) Relation to Sources of Contamination.
			 Determination of minimum lateral distances to locate a well from potential
			 sources of contamination involves evaluation of the character and location of
			 the sources of contamination, types of geologic formations present, depth to
			 the aquifer, direction of groundwater flow, effect on the groundwater movement
			 by well pumping, and possibilities of flooding of the site by surface waters.
			 Based on practice and experience, accepted minimum lateral distances for some
			 common sources of pollution with respect to a well are established in Table C.
			 Other soil conditions or other sources of contamination shall be evaluated in
			 each particular situation and a distance arrived at based on the pertinent
			 facts. The Department may be called on for assistance in determining a proper
			 distance.
1) Prohibitions. No new water well
			 may be located within 200 feet of any potential primary or potential secondary
			 source or any potential route, unless some other distance is allowed or
			 required in Table C. If the owner is the same for both the well to serve the
			 private water system and a potential secondary source or a potential route, the
			 well shall be no closer than 75 feet from the potential route or potential
			 secondary source, unless some other distance is allowed or required in Table
			 C.
2) If the owner of a water well
			 is the same owner of a potential primary source, potential secondary source, or
			 potential route, the Department will allow a variance to the minimum separation
			 distances required between a water well and a potential primary source,
			 potential secondary source, or potential route if the owner of the potable
			 water well demonstrates that applicable protective measures will be used to
			 minimize the potential for contamination of the well, and if the resulting well
			 installation can be expected to provide a continuously safe and sanitary water
			 supply in compliance with the Act, this Part and the Department's Drinking
			 Water Systems Code. Protective measures may include ensuring that sources of
			 contamination are down grade from the water source or isolation of the
			 potential source of contamination so as to prevent a route of contamination of
			 the groundwater, or isolating the potential source of contamination to prevent
			 accidental introduction of contaminants into groundwater. To obtain a variance,
			 the owner shall comply with Section
			 920.30(c).
			 (See Section 6(a) of the Act.)