The Lahontan Regional Water Quality Control Board has proposed a $4.1 million settlement with the former and current owners of a South Lake Tahoe, California, property to address tetrachloroethylene (PCE) contamination affecting municipal drinking water supplies. … The settlement is intended to protect drinking water supplies affected by a groundwater plume originating from dry-cleaning activities at the property between 1972 and 1979. … If approved, the settlement would establish a 59-year groundwater monitoring and response program using monitoring wells to detect elevated PCE levels before they reach municipal wells. It would also fund groundwater treatment as needed, compensate the water providers for past and ongoing impacts and continue remediation at the contamination source through measures such as soil vapor extraction and targeted groundwater treatment.