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: Notice of Preparation

    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 demands throughout the North Bay region.

    The NBWRA is proposing Phase 2 of the North Bay Water Reuse Program (Phase 2 Program). The Water Agency will act as Lead Agency under the California Environmental Quality Act (CEQA) for preparing a joint Environmental Impact Report (EIR)/Environmental Impact Statement (EIS). The Department of Interior, Bureau of Reclamation, will be the federal Lead Agency under the National Environmental Policy Act (NEPA) for preparing an Environmental Impact Statement (EIS).

    A Notice of Preparation (NOP) for the Phase 2 Program is available for public review. The NOP describes the proposed project, as defined under CEQA, that will be reviewed in the EIR/EIS and identifies the issue areas that will be studied in the environmental review. Agencies and interested members of the public are invited to provide input on the scope of the environmental analysis to be evaluated.

    Scoping Meetings

    In order for the public and regulatory agencies to have an opportunity to ask questions and submit comments on the scope of the EIR/EIS, a series of scoping meetings will be held within Marin, Sonoma, and Napa counties during the NOP review period. The scoping meetings will be held on the following dates:


    August 2, 2017 (Wednesday)

    6:30 PM – 8:00 PM

    San Rafael Community Center Auditorium

    618 B Street, San Rafael


    August 3, 2017 (Thursday)

    6:30 PM – 8:00 PM

    American Canyon City Hall (Council Chambers)

    4381 Broadway, Suite 201, American Canyon


    August 9, 2017 (Wednesday)

    6:30 PM – 8:00 PM

    Petaluma Community Center, Meeting Room A-D

    320 North McDowell Boulevard, Petaluma


    August 10, 2017 (Thursday)

    6:30 PM – 8:00 PM

    Sonoma Community Center, Room 110

    276 East Napa Street, Sonoma


    If you have a disability which requires an accommodation, an alternative format, or requires another person to assist you while attending these meetings or reviewing associated materials, please contact the Sonoma County Water Agency at 707-524-8378, as soon as possible to ensure arrangements for accommodation.

    Documents or files related to the proposed project are available for review at www.nbwra.org and the member agency offices; they can be also made available by emailing Phase2EIR@nbwra.org. If you have any questions, or if you wish to update your information on our mailing list, please call Ms. Anne Crealock of the Water Agency at (707) 547-1948.

    Public Comment Period for this Notice of Preparation

    The public comment period for the Phase 2 Program NOP will close at 5:00 p.m. on August 21, 2017. To submit a comment, please include a name, address, email address, and telephone number of a contact person in your agency for all future correspondence on this subject. Please send your comments to:

    Sonoma County Water Agency

    Anne Crealock

    404 Aviation Blvd.

    Santa Rosa, CA 95403

    You may also submit your comments electronically at the following website: www.nbwra.org

    Or via e-mail to: Phase2EIR@nbwra.org

    Before including your name, address, phone number, e-mail address, or other personal identifying information in your comment, you should be aware that your entire comment – including your personal identifying information – may be made publicly available at any time.

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


    Occidental Wastewater Transport Plan Proposed

    The Sonoma County Water Agency (Water Agency), which operates the Occidental County Sanitation District’s (District) Wastewater Treatment Facility, is proposing a project that would transport 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 District currently discharges secondary treated wastewater into a pond located at the headwaters of Dutch Bill Creek during the summer and to Dutch Bill Creek during the winter. The Project would bring the District into compliance with the law by ending wastewater treatment at the existing WWTF. Instead, the wastewater would be transported from the District’s lift station to the Airport-Larkfield-Wikiup Sanitation Zone (ALWSZ) wastewater treatment facility for tertiary level treatment and reuse for irrigation.

    Notice of Preparation of Initial Study - Occidental-to-Airport Wastewater Transport Project

    Occidental-to-Airport Wastewater Transport Project FAQS


    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