Clean Water Act discharge permit · NPDES CA0023655
SONOMA WEST HOLDINGS, WWTF, PLANT NO. 2, Sebastopol, CA: NPDES CA0023655 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 142Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
SONOMA WEST HOLDINGS, WWTF, PLANT NO. 2, held by Sonoma West Holdings, Inc, holds NPDES permit CA0023655, which discharges to Barlow Creek. EPA’s file records it issued April 29, 2010 and expiring June 13, 2015. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SONOMA WEST HOLDINGS, WWTF, PLANT NO. 2 |
|---|---|
| Permittee as filed | Sonoma West Holdings, Inc |
| NPDES ID | CA0023655 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Industrial stormwater |
| Issued | April 29, 2010 |
| Expiration date | June 13, 2015 |
| Address | Sebastopol, CA 95472 |
| Receiving water | Barlow Creek |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Green Valley Creek (HUC 180101100901) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 162Pollutants on file
- 142Under a numeric limit
- 42With a violation of any kind
- 0With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant; the 60 with the most exceedances of 162 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 4 | 38 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 30 | 0 | ||
| Turbidity | 2 | 16 | 0 | ||
| pH | 2 | 16 | 0 | ||
| Cyanide, total [as CN] | 2 | 16 | 0 | ||
| Zinc, total recoverable | 2 | 16 | 0 | ||
| Copper, total recoverable | 2 | 16 | 0 | ||
| Coliform, total general | 2 | 16 | 0 | ||
| 96Hr Acute Ceriodaphn. Dubia % Srv | 2 | 16 | 0 | ||
| %Surv Static Renewal 96Hr Oncorhynchus mykiss | 2 | 16 | 0 | ||
| Solids, total suspended | 1 | 15 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 15 | 0 | ||
| Thallium, total recoverable | 1 | 14 | 0 | ||
| Lead, total recoverable | 1 | 14 | 0 | ||
| Mercury, total recoverable | 1 | 14 | 0 | ||
| Specific conductance | 0 | 14 | 0 | ||
| Iron, total recoverable | 0 | 14 | 0 | ||
| Aluminum, total recoverable | 0 | 14 | 0 | ||
| Foaming agents | 0 | 14 | 0 | ||
| Manganese, total recoverable | 0 | 14 | 0 | ||
| Solids, total dissolved | 0 | 14 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | 0 | 14 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Oncorhynchus mykiss | 0 | 14 | 0 | ||
| Temperature, water deg. centigrade | 1 | 8 | 0 | ||
| Solids, settleable | 1 | 8 | 0 | ||
| Nitrogen, nitrate total [as N] | 1 | 8 | 0 | ||
| Nitrogen, nitrite total [as N] | 0 | 7 | 0 | ||
| Phosphorus, total [as P] | 0 | 7 | 0 | ||
| Coliform, fecal general | 0 | 7 | 0 | ||
| Dilution factor | 0 | 7 | 0 | ||
| %Effect Static Renewal 96Hr Acute Ceriodaphnia dubia | 0 | 7 | 0 | ||
| %Effect Static Renewal 96Hr Acute Oncorhynchus mykiss | 0 | 7 | 0 | ||
| Pass/Fail Static 4 Day Chronic Raphidocelis subcapitata | 0 | 4 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 4 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 0 | 4 | 0 | ||
| Selenium, total recoverable | 2 | 2 | 0 | ||
| Nickel, total recoverable | 2 | 2 | 0 | ||
| Cadmium, total recoverable | 2 | 2 | 0 | ||
| Chlorine, total residual | 2 | 2 | 0 | ||
| %Effect Static 4 Day Chronic Raphidocelis subcapitata | 0 | 2 | 0 | ||
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 2 | 0 | ||
| %Effect Static Renewal 7Day Chronic Pimephales promelas | 0 | 2 | 0 | ||
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | 2 | 0 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 2 | 0 | 0 | ||
| Arsenic, total recoverable | 1 | 0 | 0 | ||
| Beryllium, total recoverable [as Be] | 1 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 1 | 0 | 0 | ||
| Chromium, trivalent [as Cr] | 1 | 0 | 0 | ||
| Silver total recoverable | 1 | 0 | 0 | ||
| Antimony, total recoverable | 1 | 0 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 1 | 0 | 0 | ||
| Dichlorobromomethane | 1 | 0 | 0 | ||
| Carbon tetrachloride | 1 | 0 | 0 | ||
| 1,2-Dichloroethane | 1 | 0 | 0 | ||
| Bromoform | 1 | 0 | 0 | ||
| Dibromochloromethane | 1 | 0 | 0 | ||
| Chloroform | 1 | 0 | 0 | ||
| Toluene | 1 | 0 | 0 | ||
| Benzene | 1 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES CA0023655.
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES CA0023655.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.