Conn. Gen. Stat. § 22a-354cc

Regulated activity, as defined in section 22a-354h , shall not be prohibited in aquifer protection areas on any municipally owned site undergoing remedial action pursuant to 40 CFR 271 at the time the applicable aquifer protection area is designated on a municipal zoning district map or inland wetland map, provided: (1) No such regulated activity substantially commenced or was in active operation for the five-year period preceding the date that the applicable aquifer protection area is designated on a municipal zoning district map or inland wetland map, and (2) any person who engages in such regulated activity for the ten-year period commencing on the date that such applicable aquifer protection area is designated on a municipal zoning district map or inland wetland map registers such regulated activity on a form prescribed by the Commissioner of Energy and Environmental Protection and in accordance with the provisions of section 22a-354i-7 of the regulations of Connecticut state agencies.