MI HB5459

Water suppliers must sample and test their public water supply annually for the presence of lead and copper.

Testing must follow specific protocols including separate sampling pools for residences with lead service lines, copper pipes soldered with lead installed after 1982, and all other residences, with sampling conducted on a random basis.

Sample sizes must be determined before testing begins and targeted to yield results at a 95% confidence level and 5% confidence interval, unless lower confidence levels are required due to customer participation rates.

Water suppliers must notify customers whose water is sampled of the test results, including state drinking water standards and lead and copper levels found in samples from their residence.

If testing reveals lead or copper concentrations exceeding action levels, suppliers must conduct additional profile testing and include results and household water use advice, including flushing instructions, in public notices and education materials.

Water suppliers must annually notify customers with lead service lines that their residence is served by a lead service line and provide information about health effects of lead and advice on household water use.