Clean Water Act discharge permit · NPDES CA0023051
OCCIDENTAL CSD WWTF, Occidental, CA: NPDES CA0023051 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 22Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
OCCIDENTAL CSD WWTF, held by SONOMA COUNTY WATER AGENCY, holds NPDES permit CA0023051, which discharges to Russian/Dutch Bill C. EPA’s file records it issued May 27, 1993 and expiring May 27, 1998. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | OCCIDENTAL CSD WWTF |
|---|---|
| Permittee as filed | SONOMA COUNTY WATER AGENCY |
| NPDES ID | CA0023051 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 27, 1993 |
| Expiration date | May 27, 1998 |
| Address | Occidental, CA 95465 |
| Receiving water | RUSSIAN/DUTCH BILL C |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lower Santa Rosa Creek (HUC 180101100703) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 144Pollutants on file
- 22Under a numeric limit
- 132With a violation of any kind
- 9With 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 144 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 11 | 7 | 7 | April 30, 2018 | 357% over the limit |
| Solids, total suspended | 11 | 7 | 7 | April 30, 2018 | 338% over the limit |
| Nitrogen, ammonia total [as N] | 1 | 4 | 4 | April 30, 2018 | 1,733% over the limit |
| Copper, total recoverable | 0 | 4 | 4 | April 30, 2018 | 1,020% over the limit |
| Lead, total recoverable | 1 | 3 | 3 | April 30, 2018 | 315% over the limit |
| %Surv Static Renewal 96Hr Acute Ceriodaphnia dubia | 0 | 3 | 3 | June 30, 2018 | 100% over the limit |
| Coliform, total general | 2 | 2 | 2 | September 30, 2017 | 6,857% over the limit |
| Dichlorobromomethane | 1 | 2 | 2 | April 30, 2018 | 86% over the limit |
| Solids, suspended percent removal | 0 | 2 | 2 | April 30, 2018 | 147% over the limit |
| Solids, settleable | 3 | 2 | 0 | ||
| Chlorine, total residual | 3 | 2 | 0 | ||
| Silver total recoverable | 1 | 1 | 0 | ||
| Zinc, total recoverable | 1 | 1 | 0 | ||
| Arsenic, total recoverable | 0 | 1 | 0 | ||
| Selenium, total recoverable | 0 | 1 | 0 | ||
| Thallium, total recoverable | 0 | 1 | 0 | ||
| Beryllium, total recoverable [as Be] | 0 | 1 | 0 | ||
| Chromium, hexavalent [as Cr] | 0 | 1 | 0 | ||
| Chromium, trivalent [as Cr] | 0 | 1 | 0 | ||
| Nickel, total recoverable | 0 | 1 | 0 | ||
| Cadmium, total recoverable | 0 | 1 | 0 | ||
| Antimony, total recoverable | 0 | 1 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 0 | 1 | 0 | ||
| Carbon tetrachloride | 0 | 1 | 0 | ||
| 1,2-Dichloroethane | 0 | 1 | 0 | ||
| Bromoform | 0 | 1 | 0 | ||
| Dibromochloromethane | 0 | 1 | 0 | ||
| Chloroform | 0 | 1 | 0 | ||
| Toluene | 0 | 1 | 0 | ||
| Benzene | 0 | 1 | 0 | ||
| .delta.-BHC | 0 | 1 | 0 | ||
| Acenaphthylene | 0 | 1 | 0 | ||
| Acenaphthene | 0 | 1 | 0 | ||
| Acrolein | 0 | 1 | 0 | ||
| Acrylonitrile | 0 | 1 | 0 | ||
| Anthracene | 0 | 1 | 0 | ||
| Benzo[b]fluoranthene | 0 | 1 | 0 | ||
| Benzo[k]fluoranthene | 0 | 1 | 0 | ||
| Benzo[a]pyrene | 0 | 1 | 0 | ||
| Bis[2-chloroethyl] ether | 0 | 1 | 0 | ||
| Bis[2-chloroethoxy]methane | 0 | 1 | 0 | ||
| Bis[2-chloroisopropyl] ether | 0 | 1 | 0 | ||
| Butyl benzyl phthalate | 0 | 1 | 0 | ||
| Chlorobenzene | 0 | 1 | 0 | ||
| Chrysene | 0 | 1 | 0 | ||
| Diethyl phthalate | 0 | 1 | 0 | ||
| Dimethyl phthalate | 0 | 1 | 0 | ||
| 1,2-Diphenylhydrazine | 0 | 1 | 0 | ||
| Endosulfan sulfate | 0 | 1 | 0 | ||
| .beta.-Endosulfan | 0 | 1 | 0 | ||
| .alpha.-Endosulfan | 0 | 1 | 0 | ||
| Endrin aldehyde | 0 | 1 | 0 | ||
| Ethylbenzene | 0 | 1 | 0 | ||
| Fluoranthene | 0 | 1 | 0 | ||
| Fluorene | 0 | 1 | 0 | ||
| Hexachlorocyclopentadiene | 0 | 1 | 0 | ||
| Hexachlorobutadiene | 0 | 1 | 0 | ||
| Hexachloroethane | 0 | 1 | 0 | ||
| Indeno[1,2,3-cd]pyrene | 0 | 1 | 0 | ||
| Isophorone | 0 | 1 | 0 |
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 CA0023051.
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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Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.