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.

     


    North Bay Water Reuse Program, Phase 2

    The Water Agency is a member of, and contract administrator for, the North Bay Water Reuse Authority (NBWRA). The NBWRA is a coordinated effort of three counties and 10 water and sanitation agencies, working together as one entity, to address water supply shortages from a watershed perspective. The member agencies are investing in a number of diverse recycled water projects to offset potable water demands throughout the North Bay region.

    The NBWRA is proposing Phase 2 of the North Bay Water Reuse Program (Phase 2 Program). The NBWRA has prepared a joint Draft Environmental Impact Report / Environmental Impact Statement (EIR/EIS) pursuant to the California Environmental Quality Act (CEQA) and the National Environment Policy Act (NEPA) to assess potential environmental effects of their proposed North Bay Water Reuse Program Phase 2, or NBWRP Phase 2. The Sonoma County Water Agency (SCWA) will act as Lead Agency under CEQA and the Department of Interior, Bureau of Reclamation, will be the federal Lead Agency under NEPA.

    Draft EIR/EIS Public Comment:

    The 45-day CEQA review period begins on April 4, 2018 and extends to 5:00 pm PST on May 18, 2018. Written comments on the Draft EIR/EIS may be submitted to:

    Sonoma County Water Agency
    Attn: Anne Crealock
    404 Aviation Boulevard
    Santa Rosa, CA 95403

    You may also submit your comments electronically at the following website, www.nbwra.org or Phase2EIR@nbwra.org.

    Public Hearings: 

    A series of four public hearings will be held within the collective NBWRA service area during the 45-day review period to obtain public comment on the Draft EIR/EIS. (The same content will be presented at each meeting.) The public hearings will be held on the following dates:

    May 7, 2018 (Monday)
    6:30 PM – 8:00 PM
    American Canyon City Hall (Council Chambers)
    4381 Broadway, Suite 201, American Canyon

    May 9, 2018 (Wednesday)
    6:30 PM – 8:00 PM
    San Rafael Community Center Auditorium
    618 B Street, San Rafael

    May 10, 2018 (Thursday)
    6:30 PM – 8:00 PM
    Petaluma Community Center, Craft Room 1
    320 North McDowell Boulevard, Petaluma

    May 14, 2018 (Monday)
    6:30 PM – 8:00 PM
    Sonoma Community Center, Room 110
    276 East Napa Street, Sonoma

    Project Website:

    For more information on this project, please visit: http://www.nbwra.org/project-descriptions/phase-2/public-participation/

    Documents:

    NBWRA Phase 2 - Notice of Preparation (PDF, 3MB)

    NBWRA Phase 2 - Notice of Availability (PDF, 1MB)

    NBWRA Phase 2 - Draft Environmental Impact Report / Environmental Impact Statement (PDF, 33 MB)

     


    Occidental Wastewater Transport Plan

    In December 2017, the Board of Directors of the Sonoma County Water Agency (Water Agency), which operates the Occidental County Sanitation District’s (District) Wastewater Treatment Facility, approved a project for transporting untreated wastewater from the OCSD to the Airport-Larkfield-Wikiup Sanitation Zone (ALWSZ) for treatment, storage, and reuse to avoid future discharges into Dutch Bill Creek and potential violations of the District’s operating permit.

    The Project, which is currently under construction, will allow the Occidental County Sanitation District (District) to comply with conditions set forth by the North Coast Regional Water Quality Control Board in Order No. R1-2012-0101 (Order). This order requires the OCSD to cease discharging secondary treated recycled water to Dutch Bill Creek by January 31, 2018. The Project includes transporting untreated wastewater to the ALWSZ wastewater treatment facility for treatment, storage, and disposal. The ALWSZ wastewater treatment facility currently treats wastewater to secondary and tertiary standards and utilizes irrigation of agricultural lands for disposal of secondary and tertiary-treated recycled water.

     

     


    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.

     


    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