Clean Water Act discharge permit · NPDES CA0023639
GRATON CSD WWTF, Sebastopol, CA: NPDES CA0023639 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 183Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
GRATON CSD WWTF, held by Graton Community Services District, holds NPDES permit CA0023639, which discharges to Atascadero Creek, Green Valley Cr., Russian Riv.. EPA’s file records it issued March 15, 2012 and expiring April 30, 2017. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | GRATON CSD WWTF |
|---|---|
| Permittee as filed | Graton Community Services District |
| NPDES ID | CA0023639 |
| 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 | March 15, 2012 |
| Expiration date | April 30, 2017 |
| Address | Sebastopol, CA 95472 |
| Receiving water | Atascadero Creek, Green Valley Cr., Russian Riv. |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Green Valley Creek (HUC 180101100901) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 191Pollutants on file
- 183Under a numeric limit
- 38With 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 191 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Coliform, total general | 3 | 28 | 28 | February 28, 2026 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 10 | 17 | 7 | March 31, 2021 | 180% over the limit |
| Chlorine, total residual | 4 | 39 | 2 | December 31, 2016 | 900% over the limit |
| TCDD equivalents | 1 | 10 | 2 | May 31, 2019 | 2,147,483,650% over the limit |
| pH | 4 | 29 | 1 | January 31, 2022 | |
| Cyanide, total [as CN] | 3 | 21 | 1 | April 30, 2018 | 38% over the limit |
| Nitrogen, ammonia total [as N] | 1 | 14 | 1 | February 28, 2023 | 45% over the limit |
| Solids, total suspended | 10 | 11 | 1 | February 28, 2021 | 7% over the limit |
| Solids, suspended percent removal | 1 | 2 | 1 | April 30, 2018 | 20% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 36 | 0 | ||
| Temperature, water deg. fahrenheit | 4 | 24 | 0 | ||
| 96Hr Acute Ceriodaphn. Dubia % Srv | 2 | 22 | 0 | ||
| %Surv Static Renewal 96Hr Oncorhynchus mykiss | 2 | 22 | 0 | ||
| Dichlorobromomethane | 3 | 20 | 0 | ||
| %Surv Static Renewal 96Hr Acute Ceriodaphnia dubia | 2 | 20 | 0 | ||
| %Surv Static 96Hr Acute Oncorhynchus Mykiss | 2 | 20 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 14 | 0 | ||
| Ammonia, unionized | 1 | 14 | 0 | ||
| Nitrogen, nitrate total [as N] | 1 | 14 | 0 | ||
| Phosphorus, total [as P] | 1 | 14 | 0 | ||
| Dilution factor | 1 | 14 | 0 | ||
| Solids, settleable | 3 | 10 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 4 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 4 | 4 | 0 | ||
| Pass/Fail Static 96Hr Chronic Selen. Capricornutum | 4 | 2 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 4 | 2 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 4 | 2 | 0 | ||
| Static 96Hr Chronic Selen. Capricornutum | 4 | 2 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 2 | 0 | ||
| Pass/Fail Static 4 Day Chronic Raphidocelis subcapitata | 0 | 2 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia | 0 | 2 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Oncorhynchus mykiss | 0 | 2 | 0 | ||
| BOD, 5-day, percent removal | 1 | 1 | 0 | ||
| %Effect Static 4 Day Chronic Raphidocelis subcapitata | 0 | 1 | 0 | ||
| %Effect Static Renewal 96Hr Acute Ceriodaphnia dubia | 0 | 1 | 0 | ||
| %Effect Static Renewal 96Hr Acute Oncorhynchus mykiss | 0 | 1 | 0 | ||
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 1 | 0 | ||
| %Effect Static Renewal 7Day Chronic Pimephales promelas | 0 | 1 | 0 | ||
| Turbidity | 2 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Asbestos | 1 | 0 | 0 | ||
| Arsenic, total recoverable | 1 | 0 | 0 | ||
| Iron, total recoverable | 1 | 0 | 0 | ||
| Selenium, total recoverable | 1 | 0 | 0 | ||
| Thallium, 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 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Silver total recoverable | 1 | 0 | 0 | ||
| Zinc, total recoverable | 1 | 0 | 0 | ||
| Aluminum, total recoverable | 1 | 0 | 0 | ||
| Cadmium, total recoverable | 1 | 0 | 0 | ||
| Lead, total recoverable | 1 | 0 | 0 | ||
| Copper, total recoverable | 1 | 0 | 0 | ||
| Antimony, total recoverable | 1 | 0 | 0 | ||
| Foaming agents | 1 | 0 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 1 | 0 | 0 | ||
| Diquat | 1 | 0 | 0 | ||
| Manganese, total recoverable | 1 | 0 | 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 CA0023639.
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 October 14, 2026.