Conn. Gen. Stat. § 25-40a: Notification of violation of national primary drinking water standards.

(a) Not later than twenty-four hours after obtaining a public water system test result that shows a contaminant at a level that is in violation of the federal Environmental Protection Agency national primary drinking water standards for a public water system that does not submit a water supply plan pursuant to section 25-32d, the environmental laboratory that performed the test shall notify any persons who requested such test or such person's designee, in a form and manner prescribed by the Commissioner of Public Health, of such test result. Such person shall notify the Department of Public Health in a form and manner prescribed by the Commissioner of Public Health not later than twenty-four hours after obtaining such notification. As used in this subsection, “contaminant” means e. coli, lead, nitrate and nitrite.

(b) Not later than five business days after receiving notice that a public water system is in violation of the federal Environmental Protection Agency national primary drinking water standards, the Commissioner of Public Health, or the commissioner's designee, shall give written or electronic notification of such violation to the chief elected official of the municipality where such public water system is located and of any municipality that is served by such public water system.