Sonoma Valley County Sanitation District

Sewer operator · California · Sonoma

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Ringed dots mark treatment plant outfalls.

Federal wastewater discharge permit (NPDES): CA0037800
Wastewater outlets: 6 treatment plant outfalls listed by EPA or state agencies; no combined sewer outfall is listed · List
Waters listed as receiving wastewater: Schell Slough; Ringstrom Bay; Management Unit 3; Management Unit 1; Napa-Sonoma Salt Marsh Restoration Area; Pond 7A
Tracked waters: Schell Slough, CA
Discharge records counted: 0 records
Total reported volume in these records: No numeric volumes are available in these tracked records.

These totals reflect the records we track. Missing volumes and gaps in reporting limit comparisons between operators.

Sources: EPA ECHO and the operator and state sources linked below. Counts use the discharge records on this page. Updated 2026-11-06 09:03 UTC.

Public notices and alerts

We do not list an alert service for this operator yet. Check its website.

Its public-notice channels

Health department page · Required by law
Health officer notice not read

Health and Safety Code 5411.5(a): any person who causes or permits a discharge of sewage in or on waters of the State "shall, as soon as that person has knowledge of the discharge, immediately notify the local health officer or the director of environmental health of the discharge"

Source: Sonoma Valley County Sanitation District's public notice and alert pages and the state's notification records; DirtyWaterWatch register of public-notice channels and its page monitor.

Report a missing notice or error

Wastewater outlets

Outfall: a pipe or outlet where wastewater enters a water body.

6 treatment plant outfalls listed by EPA or state agencies; no combined sewer outfall is listed.

Treatment plant outfalls

6 outfalls

Outfall EFF1 · receiving water in the permit: Schell Slough · Schell Slough, CA · status not published
Outfall EFF3 · receiving water in the permit: Ringstrom Bay · no water record yet · status not published
Outfall EFF4 · receiving water in the permit: Management Unit 3 · no water record yet · status not published
Outfall EFF5 · receiving water in the permit: Management Unit 1 · no water record yet · status not published
Outfall EFF6 · receiving water in the permit: Napa-Sonoma Salt Marsh Restoration Area · no water record yet · status not published
Outfall EFF7 · receiving water in the permit: Pond 7A · no water record yet · status not published

Source: U.S. Environmental Protection Agency (EPA) permit records (ICIS-NPDES permitted features): where a treatment plant’s permitted discharge leaves. No national source says whether a plant outfall is open or closed.

Reports and advisories

No reports are linked to this operator yet.

The last 90 days

Last 90 days, hour by hour. Red: discharge or advisory reported. Amber: caution. Hatched amber: end not confirmed. Plum: algal bloom advisory. Red or amber with a light line inside: beach advisory or caution. Dotted: monthly report (days with discharge, dates not given). Grey: no current status on the water outline. Purple hatching: a status resting on a source that could not be checked on schedule.

No discharge, advisory or caution periods are shown for the waters this sewer operator's reports were placed on in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-06 09:03 UTC.

Reported discharges over time

Historical charts are not available here. See the reports and sources on this page.