(1) At a minimum, unless contamination risk is evident, water wells shall not be located within:
(a) 50 feet of septic tanks, and underground storage tanks and associated lines; or
(b) 100 feet of drainfields, seepage pits or cesspools, unregulated sewage lagoons, or other site treatment systems; or
(c) 1,000 feet of regulated sewage lagoons; wells less than 1,000 feet setback must be in compliance with the Department of Environmental Quality under ARM 17.30.1702.
(2) Water wells should not be located
(a) 10 feet of property lines unless
properly protected by easement or agreement;
(b) 10 feet of sewer lines with permanent
watertight joints; or
(c) 50 feet of other sewer lines.
(3) Contractors should contact local flood
plain administrators for rules pertaining to wells in flood plain areas.