Environmental Documents

    Below are recent Environmental Impact Reports, Notice of Availabilities, and Notices of Preparation of an Initial Study for Sonoma County Water Agency Projects. Learn more about regulatory compliance.

     


    Occidental County Sanitation District Sewer Wastewater Compliance Transport Project

    The Occidental County Sanitation District Sewer Wastewater Compliance Transport Project would allow Occidental’s wastewater to be transported, treated and discharged at treatment plants near Guerneville and Airport Business Park by making minor modifications to the District's wastewater treatment facility on Lu Dan Road, lift station on Bohemian Highway, and the Russian River County Sanitation District's main lift station and an adjacent parcel of land.

    All modifications are needed in the Project in order to bring the District into compliance with the North Coast Regional Water Quality Control Board's law to protect the habitat for endangered coho salmon that live in the watershed where recycled water is discharged.

    A Draft Initial Study/Negative Declaration (IS/ND), in compliance with the California Environmental Quality Act, was released on December 21. The deadline for public comments closed February 24, 2017.

    Printed copies of the IS/ND can be found at the following locations:

    • Sonoma County Water Agency: 404 Aviation Blvd Santa Rosa, CA 95403
    • Guerneville Regional Library: 14107 Armstrong Woods Road, Guerneville, CA 95446
    • Occidental Library:  73 Main Street, Occidental, CA 95465
    • Forestville Library:  7050 Covey Road, Forestville CA. 95436

    Draft Initial Study/Negative Declaration (PDF)

    Wastewater Compliance Transport Project - Frequently Asked Questions (PDF)

     


    Fish Habitat Flows and Water Rights Project - Draft EIR

    On August 19, 2016, the Water Agency released the Fish Habitat Flows and Water Rights Project (Fish Flow Project) Draft Environmental Impact Report (DEIR) for public review. The Fish Flow Project DEIR describes the Proposed Project, the purpose of the project, why it is necessary and the potential environmental impacts of the project.

    The Fish Flow Project has five purposes:

    1. Comply with National Marine Fisheries Service’s Russian River Biological Opinion, which requires the Water Agency to ask the State Water Board to lower minimum instream flow requirements in the Russian River and Dry Creek in order to improve conditions for coho and steelhead.
    2. Improve conditions for threatened Chinook salmon, by better preserving cold water in Lake Mendocino, which can be released for the fall Chinook migration.
    3. Replace a measuring requirement in the Water Agency’s water right permits, called the “hydrologic index,” to better reflect conditions in the Russian River watershed.
    4. Extend to 2040 the Water Agency’s right to divert and re-divert 75,000 acre feet of water annually, in order to ensure a reliable water supply for more than 600,000 people.
    5. Add existing points of diversion for Occidental Community Service District and the Town of Windsor as authorized points of diversion in the Water Agency’s water right permits. (The Water Agency has agreements with specific entities, including Occidental and Windsor, that authorize them to divert water from the Russian River under the Water Agency’s water right permits using their own facilities. The proposed change would allow these entities to report water diverted through these existing points of diversion under the Water Agency’s water right permits, and would not increase the total amount of diversions.)

    View the Fish Flow Project Page for more information

     


    Mark West Creek Crossing Project: Russian River-Cotati Intertie Pipeline Seismic Hazard Mitigation

    The purpose of the Project is to reduce potential pipe failure and loss of water supply service resulting from permanent ground deformation caused by a moderate or severe earthquake along the Rodger’s Creek Fault. To maintain safe and reliable water service during a seismic  event, the Project would modify the Russian River-Cotati Intertie to improve its ability to withstand the effects of ground deformation,
    liquefaction, and lateral spread hazards. The project consists of installation, operation, and maintenance of approximately 767 linear feet of a 48-inch diameter steel pipeline segment across the Mark West Creek channel (Figure 2). The new pipeline segment would replace the existing pipeline segment beneath the creek channel and would be installed parallel to (and within 25 feet of) the existing pipeline and buried 6 to 8 feet deeper than the existing pipeline. The existing pipeline segment would be disconnected, filled with a low strength concrete mixture, and abandoned in place. The new pipeline segment would tie into the existing 48-inch diameter Russian River-Cotati Intertie pipeline.

     


    Russian River Crossing Project: Russian River - Cotati Intertie Pipeline Seismic Hazard Mitigation

    The Water Agency owns, operates, and maintains a 48-inch diameter steel water supply pipeline (referred to as the Russian River-Cotati Intertie) that crosses the southern and eastern aqueduct transmission lines and crosses the Russian River in Sonoma County. The pipeline is buried at a relatively shallow depth (approximately 7 feet below ground surface) across the Russian River channel and stream banks, and crosses seismically unstable terrain.

    The Local Hazard Mitigation Plan (LHMP) identifies the Russian River-Cotati Intertie Intertie crossing of the Russian River as vulnerable to potential ground deformation, liquefaction, and lateral spread resulting from strong ground shaking in the soil at or below the elevation of the pipeline. The LHMP states that pipeline failure from an earthquake would isolate the Mirabel collector wells from the Russian River-Cotati Intertie Intertie Pipeline.

    The proposed project is needed to address seismic concerns related to reliable delivery of water to the Water Agency’s service area and prevent the loss of an essential water service due to a moderate or severe earthquake along the Rodger's Creek/Hayward Fault.

     


    Dry Creek Habitat Enhancement Project, Miles 2-6 - Draft Environmental Impact Report

    The Sonoma County Water Agency (Water Agency), as Lead Agency, has prepared this Draft Environmental Impact Report (EIR) for Dry Creek Habitat Enhancement Project, Miles 2–6 (proposed project) to provide the public and responsible and trustee agencies reviewing the Dry Creek Habitat Enhancement Project an analysis of the potential effects, both beneficial and adverse, on the environment.1 This project is intended to fulfill federal mandates to implement habitat enhancement within Dry Creek to create both winter and summer rearing habitats for juvenile steelhead and coho salmon, with an emphasis on improving habitats for the survival of juvenile coho salmon while allowing the Water Agency to maintain the existing flow range in Dry Creek for water supply purposes.

     


    Occidental Wastewater Treatment Facility Recycled Water Project

    The Occidental County Sanitation District is preparing an Initial Study for the Occidental Wastewater Treatment Facility Recycled Water Project to upgrade the treatment plant and change how the recycled water is managed.

     


    Westside Facility

    Westside FacilityIn 2015, the Water Education Program opened a new field study facility near the intersection of Wohler Road and Westside Road. The new building will allow us to safely and more effectively serve students enrolled in our 5th Grade Field Study program.

     

     


    Mirabel Fish Screen and Fish Ladder Replacement Project

    Notice of Availability (PDF, 1MB)

    Initial Study and Mitigated Negative Declaration – Appendices Included (PDF, 13MB)

    Initial Study and Mitigated Negative Declaration – No Appendices (PDF, 3MB)

    Learn more about the Mirabel Seismic and Fish Passage Improvement Project

     


    Russian River Estuary Management Project

    View Project Page for more information

     


    North Sonoma County Agricultural Reuse Project

     


    Stream Maintenance Program Manual and EIR