415 ILCS 30/6a
Beginning January 1, 1988, no new non-community, semi-private or private water system well may be located within 200 feet of any potential primary or potential secondary source or any potential route. This prohibition does not apply to any new private water system well where the owner is the same for both the well and a potential secondary source or a potential route. In such instances, the Department shall apply a prohibition of 75 feet and shall inform the well owner of the potential hazards associated with the location of a well in close proximity to a potential source or potential route. Nothing in this Section shall affect any location and construction requirement imposed in Section 6 of this Act and regulations promulgated thereunder. The Department may grant an exception to the prohibitions in this Section where the owner is the same for both the well and a potential primary or potential secondary source or a potential route. Such exception may only be granted if a demonstration is provided by the owner of the potable water well that applicable protective measures will be utilized 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.
415 ILCS 30/6a