Requires water suppliers to reimburse residential customers for drinking water testing under certain circumstances.

This bill requires water suppliers to reimburse residential customers for drinking water testing costs when a public water system exceeds federal or state contaminant limits. It applies to homes where testing is needed due to contamination, with reimbursement requested by the local municipality. The water supplier must cover these costs directly, preventing them from being added to other customers' water bills. The law takes immediate effect and directs the environmental department to create implementing rules.