Town of Windsor Wastewater Reclamation Facility Biosolids Treatment and Disposal Upgrades


SCH Number
Lead Agency
Town of Windsor
Document Title
Town of Windsor Wastewater Reclamation Facility Biosolids Treatment and Disposal Upgrades
Document Type
MND - Mitigated Negative Declaration
Present Land Use
General Plan Designation: PQP (Public/Quasi-Public; 0.0 – 1.0 FAR); Zoning: PI (Public/Institutional; 0.0 – 1.0 FAR)
Document Description
The Windsor Water District (District) owns and operates the Windsor Water Reclamation Facility (WWRF or Facility) located in Windsor, California, to receive and treat wastewater from an estimated population of 28,000 in and around the Town of Windsor. Wastewater treatment produces solids that must then be treated and reused or disposed of offsite (biosolids). The District proposes to undertake improvements to the solids treatment process at the WWRF to produce Class A biosolids. The District is proposing to dredge an existing sludge pond, backfill the area, pave the area, and construct new facilities for handling biosolids. The new facilities would include a combination of processes that could thicken, dewater, and ultimately dry the solids material. To accommodate a new biodrying and pyrolysis treatment process, a new single-story building would be constructed within the footprint of the existing S4 sludge pond to house thickening and dewatering equipment. In addition, a separate pump station and wet well would be constructed to receive excess process wastewater, as well as stormwater from the newly paved area, to be directed back to the treatment headworks. Adjacent to the proposed thickening/dewatering/polymer building would be eight drying units with space for two additional future units. The biodrying and pyrolysis units as well as the odor control facilities would be sited on a concrete slab and covered with a canopy structure to protect the equipment from the elements. A conveyor system would be constructed to facilitate collection of dried biosolids cake that is produced as a result of the pyrolysis process.

Contact Information

David Ernst
Agency Name
Windsor Water District
Job Title
Wastewater Treatment Superintendent
Contact Types
Lead/Public Agency


Northern California
Cross Streets
Windsor Road and Patrick Lane
Total Acres
Project <1 ac
Parcel #
164-030-035, 164-130-002
State Highways
Northwestern Pacific Railroad
Windsor Creek Elementary
Windsor Creek

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, North Coast Region 1 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance
State Reviewing Agency Comments
State Water Resources Control Board, Divison of Financial Assistance
Development Types
Waste Treatment:Sewer (Biosolids Treatment Upgrades - no additional wastewater)(MGD 1.9)
Local Actions
Utility Improvements - Wastewater Reclamation Facility Biosolids Upgrades
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Energy, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from state reviewing agencies]

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