Clean Water Act discharge permit · NPDES CA0079081
CHICO WPCP, Chico, CA: NPDES CA0079081 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 143Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CHICO WPCP, held by CHICO, CITY OF, holds NPDES permit CA0079081, which discharges to Sacramento River. EPA’s file records it issued January 29, 2010 and expiring January 1, 2015. 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 | CHICO WPCP |
|---|---|
| Permittee as filed | CHICO, CITY OF |
| NPDES ID | CA0079081 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | January 29, 2010 |
| Expiration date | January 1, 2015 |
| Address | Chico, CA 95927 |
| Receiving water | SACRAMENTO RIVER |
| Subwatershed | Little Chico Creek (HUC 180201580302) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 152Pollutants on file
- 143Under a numeric limit
- 152With a violation of any kind
- 7With 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 152 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Coliform, total general | 6 | 99 | 53 | May 31, 2026 | 99,999% over the limit |
| Solids, total suspended | 19 | 179 | 18 | May 31, 1998 | 293% over the limit |
| Chlorine, total residual | 6 | 60 | 14 | September 30, 2019 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 19 | 165 | 12 | May 31, 1998 | 112% over the limit |
| Solids, settleable | 0 | 12 | 12 | April 30, 1999 | 7,400% over the limit |
| Solids, suspended percent removal | 3 | 28 | 5 | August 31, 2011 | 560% over the limit |
| BOD, 5-day, percent removal | 3 | 27 | 4 | June 30, 2011 | 560% over the limit |
| Flow, in conduit or thru treatment plant | 8 | 66 | 0 | ||
| Copper, total recoverable | 8 | 59 | 0 | ||
| Dichlorobromomethane | 8 | 58 | 0 | ||
| Dibromochloromethane | 8 | 58 | 0 | ||
| pH | 6 | 48 | 0 | ||
| Nitrogen, ammonia total [as N] | 6 | 48 | 0 | ||
| Bioassay [96 hr.] | 0 | 38 | 0 | ||
| Temperature, water deg. fahrenheit | 4 | 30 | 0 | ||
| %Surv Static Renewal 96Hr Oncorhynchus mykiss | 6 | 26 | 0 | ||
| Specific conductance | 3 | 25 | 0 | ||
| Ammonia, unionized | 3 | 23 | 0 | ||
| Zinc, total recoverable | 3 | 18 | 0 | ||
| Solids, total dissolved | 3 | 13 | 0 | ||
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | 6 | 11 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 6 | 11 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 6 | 11 | 0 | ||
| Lead, total recoverable | 3 | 8 | 0 | ||
| Cyanide, total [as CN] | 3 | 6 | 0 | ||
| Nickel, total recoverable | 3 | 6 | 0 | ||
| Silver total recoverable | 3 | 6 | 0 | ||
| Chloroform | 3 | 6 | 0 | ||
| Diethyl phthalate | 3 | 6 | 0 | ||
| Methylene chloride | 3 | 6 | 0 | ||
| Di-n-octyl phthalate | 3 | 6 | 0 | ||
| Di[2-ethylhexyl] phthalate [DEHP] | 3 | 6 | 0 | ||
| Di-n-butyl phthalate | 3 | 6 | 0 | ||
| Dieldrin | 3 | 6 | 0 | ||
| Mercury, total recoverable | 3 | 6 | 0 | ||
| Arsenic, total recoverable | 3 | 5 | 0 | ||
| Selenium, total recoverable | 3 | 5 | 0 | ||
| Thallium, total recoverable | 3 | 5 | 0 | ||
| Beryllium, total recoverable [as Be] | 3 | 5 | 0 | ||
| Chromium, hexavalent [as Cr] | 3 | 5 | 0 | ||
| Chromium, trivalent [as Cr] | 3 | 5 | 0 | ||
| Cadmium, total recoverable | 3 | 5 | 0 | ||
| Antimony, total recoverable | 3 | 5 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 3 | 5 | 0 | ||
| Carbon tetrachloride | 3 | 5 | 0 | ||
| 1,2-Dichloroethane | 3 | 5 | 0 | ||
| Bromoform | 3 | 5 | 0 | ||
| Toluene | 3 | 5 | 0 | ||
| Benzene | 3 | 5 | 0 | ||
| .delta.-BHC | 3 | 5 | 0 | ||
| Acenaphthylene | 3 | 5 | 0 | ||
| Acenaphthene | 3 | 5 | 0 | ||
| Acrolein | 3 | 5 | 0 | ||
| Acrylonitrile | 3 | 5 | 0 | ||
| Anthracene | 3 | 5 | 0 | ||
| Benzo[b]fluoranthene | 3 | 5 | 0 | ||
| Benzo[k]fluoranthene | 3 | 5 | 0 | ||
| Benzo[a]pyrene | 3 | 5 | 0 | ||
| Bis[2-chloroethyl] ether | 3 | 5 | 0 | ||
| Bis[2-chloroethoxy]methane | 3 | 5 | 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 CA0079081.
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 15, 2026.