Illinois Administrative Code › Title 77 - PUBLIC HEALTH › Part 920 - WATER WELL CONSTRUCTION CODE › Table C - Minimal Lateral Distances in Feet Between Water Wells, Closed-Loop Wells, and Sources of Contamination

Current through Register Vol. 48, No. 28, July 12, 2024
SOURCES OF CONTAMINATION OR EXISTING WATER
						  WELL
MINIMUM LATERAL DISTANCES FOR CLAY
						  AND LOAM SOILS (FEET)
WATER WELL
CLOSED LOOP WELL
Cesspool
150
150
Closed Loop Well1
200
NA
Water Well1
NA
200
Water Well (when the owner of the closed loop well and
						  a water well serving a private water supply is the
						  same)1
N/A
75
Leaching Pit
100
100
Pit Privy
75
75
Subsurface Seepage System, Distribution Box, Sand
						  Filter, Waste Stabilization Pond, Effluent Receiving Trench
75
75
Manure Pile
75
75
Septic Tank, Aerobic Treatment Plant, Surface Discharge
						  Effluent Line, Treated Effluent Discharge Point
50
50
Barnyard or Animal Confinement Lot
50
50
Footing Drains (No connection to a sewer or sump
						  handling sewage is allowed.)
10
102
Pump House Floor Drain
2
22
Pit, Crawl Space or Basement
5
52
Lake, Pond or Stream
25
253
Potential Primary Source, Potential Secondary Source,
						  or Potential Route
200
200
Potential Primary Source, Potential Secondary Source,
						  or Potential Route (when the owner of the source or route and a water well
						  serving a private water supply or closed loop well is the same)
75
75
Abandoned Wells
200
200
Sewers (Sanitary or Combined)
504
504,5
Storm Sewers
10
106
1 A closed loop well utilizing USP
				food grade propylene glycol may be located to within 25 feet of a water
				well.
2 These setbacks do not apply when
				the closed loop well is installed prior to the construction of the
				building.
3 The 25-foot separation distance
				from a pond does not apply to a closed loop well when:
1) The borehole is grouted the same day that is
				constructed;
2) The top 20 feet of the borehole is bored to a
				diameter at least 3 inches greater than the total diameter of the heat
				exchanger; and
3) The enlarged top 20 feet of the borehole is
				grouted with bentonite chips manufactured for well sealing within 24 hours
				after the construction of the borehole.
4 A water well or closed loop well
				may be located to within 10 feet of a sewer provided that the sewer consists of
				cast iron pipe with watertight mechanical joints or rubber gasket sealed joints
				that meet ASTM Standard C564-11, SDR 26 PVC pipe or schedule 40 PVC pipe or
				heavier with solvent welded watertight joints or elastomeric seals (gaskets)
				used for push-on joints that meet ASTM Standard F477-10.
5 If the sewer pipe material is
				unknown, the 50-foot separation distance may be reduced to 25 feet if the
				following conditions are met:
1) The borehole is grouted the same day that it is
				constructed;
2) The top 20 feet of the borehole is bored to a
				diameter at least 3 inches greater than the total diameter of the heat
				exchanger; and
3) The enlarged top 20 feet of the borehole is
				grouted with bentonite chips manufactured for well sealing within 24 hours
				after the construction of the borehole.
6 The 10-foot separation distance
				for a storm sewer does not apply to a closed loop well when:
1) The borehole is grouted the same day that it is
				constructed;
2) The top 20 feet of the borehole is bored to a
				diameter at least 3 inches greater than the total diameter of the heat
				exchanger; and
3) The enlarged top 20 feet of the borehole is
				grouted with bentonite chips manufactured for well sealing within 24 hours
				after the construction of the borehole.