Lake Skinner Regional Water Transmission System (formerly EM-11)

The Lake Skinner Regional Water Transmission System Project, led by the Eastern Municipal Water District in Riverside County, involves the construction and operation of infrastructure to transfer treated water from the Metropolitan Skinner Water Treatment Plant to the district's service area. The project is designed to meet a buildout demand of 140 cubic feet per second of additional treated water supplies and consists of three primary components: a new water service connection turnout, a new booster pump station, and approximately 14 miles of new and relined transmission pipelines. The project will be implemented in four phases to be fully online by 2045. Phase 1 includes the turnout and a booster pump station with a 40 cfs capacity along with 3.6 miles of relined pipeline. Phase 2 involves relining 3.2 miles of pipeline by 2035. Phase 3 includes the installation of a new 60-inch pipeline by 2040. Phase 4, to be completed by 2045, involves the installation of new 72-inch, 60-inch, and 48-inch pipelines. The project is being developed under the California Environmental Quality Act, with a Draft Program Environmental Impact Report issued in August 2026. Key compliance requirements include a Cultural Resources Monitoring Plan, tribal monitoring agreements, biological construction monitoring, and a Worker Environment Awareness Program. Additionally, the project mandates the non-disclosure of reburial locations for cultural resources. Primary contact for the project is Martha Vilchis, Water Resources Specialist Associate.