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
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:
- 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.
- Improve conditions for threatened Chinook salmon, by better preserving cold water in Lake Mendocino, which can be released for the fall Chinook migration.
- 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.
- 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.
- 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.)
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.
- Notice of Availability/Intent To Adopt Initial Study and Mitigated Negative Declaration
- Appendix A - 65% Complete Designs for the Proposed Project
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.
- Notice of Availability/Intent To Adopt Initial Study and Mitigated Negative Declaration
- Initial Study/Mitigated Negative Declaration
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.
- Learn more about the Dry Creek Habitat Enhancement Project
- Notice of Preparation of Environmental Impact Report
- Draft Environmental Impact Report Without Appendices (PDF, 16MB)
- Draft Environmental Impact Report With Appendices (PDF, 108MB)
- Final Environmental Impact Report - Response To Comments (PDF, 1.8MB)
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.
- Notice of Preparation of an Initial Study for the Occidental County Sanitation District Recycled Water Project.
In 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.
- Notice of Intent to Adopt a Mitigated Negative Declaration – Westside Facility
- Final Westside Facility Environmental Document
Mirabel Fish Screen and Fish Ladder Replacement Project
- Appendix A – Feasibility and Alternatives Study (PDF, 3MB)
- Appendix B – Notice of Preparation and Comment Letters (PDF, 6MB)
- Appendix C – Special Status Species (PDF, <1MB)
- Appendix D – Plant Species Observed (PDF, <1MB)
- Appendix E – Draft Mitigation Monitoring Plan (PDF, <1MB)
Russian River Estuary Management Project
- Download Entire Draft EIR Document (PDF, 26MB)
- ADA Disclaimer
- Table of Contents
- Glossary of Acronyms
- Executive Summary
- 1 - Introduction
- 2 - Project Description
- 3 - Project Background and Environmental Setting
- 4 - Environmental Setting, Impacts, and Mitigation Measures
- 4.1 - Geology and Soils
- 4.2 - Hydrology and Flooding
- 4.3 - Water Quality
- 4.4 - Biological Resources
- 4.5 - Fisheries
- 4.6 - Land Use and Agriculture
- 4.7 - Recreation
- 4.8 - Cultural Resources
- 4.9 - Noise
- 4.10 - Air Quality
- 4.11 - Transportation and Traffic
- 4.12- Hazards and Hazardous Materials
- 4.13 - Public Services and Utilities and Public Safety
- 4.14 - Aesthetics
- 5 - Cumulative Analysis
- 6 - Alternatives Analysis
- 7 - Other Topics Required by CEQA
- 8 - List of EIR Preparers
- Appendix 1 - Notice of Preparation, Scoping Report andScoping Comments
- Appendix 2 - Air Quality – Supporting Documentation
- (There is not an Appendix 3)
- Appendix 4 - Local Regulatory Framework Governing Environmental Resources
North Sonoma County Agricultural Reuse Project
- Notice of Availability
- Executive Summary
- Volume 1 - Final EIR/EIS - Click here to download compressed folder of all Volume 1 PDFs, 2.6MB
- Volume 2 - Appendices - Click here to download compressed folder of all Volume 2 PDFs, 101 MB
- Volume 3 - Reponse to Comments
- Figures - Click here to download compressed folder of all Figures PDFs, 58MB
Stream Maintenance Program Manual and EIR
- Stream Maintenance Program Manual – Text of all chapters (PDF, 8MB)
- Stream Maintenance Program Appendices (PDF, 10MB)
- Figures - Chapter 1 & 2 (PDF, 31MB)
- Figures – Chapter 3 (PDF, 120MB)
- Figures – Chapter 4: Mark West Creek (PDF, 12MB)
- Figures – Chapter 4: Petaluma River (PDF, 41MB)
- Figures – Chapter 4: Roseland/Colgan Creek (PDF, 31MB)
- Figures – Chapter 4: Santa Rosa Creek (PDF, 82MB)
- Figures – Chapter 4: Sonoma Creek (PDF, 9MB)
- Figures – Chapter 4: Laguna de Santa Rosa (PDF, 66MB)
- Figures – Chapter 4: Windsor Creek (PDF, 23MB)
- Figures – Chapter 5,6,8,9 (PDF, 52MB)
- Stream Maintenance Program Draft EIR Notice of Availability
- Stream Maintenance Final EIR
- Final Stream Maintenance EIR Cover
- Stream Maintenance Final EIR_Notice of Availability
- Updated Stream Maintenance Addendum, Updated 7/8/09
- Stream Maintenance Program: Revised Appendix B: Sediment Sampling and Analysis Guidelines, Updated 7/8/09 (PDF, .4MB)