Clean Water Act discharge permit · NPDES CA0081795
WAWONA WWTF, Mariposa County, CA: NPDES CA0081795 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 23Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
WAWONA WWTF, held by USDI, NPS, YOSEMITE, holds NPDES permit CA0081795, which discharges to South Fork Of Merced River. EPA’s file records it issued October 21, 2005 and expiring October 21, 2010. 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 | WAWONA WWTF |
|---|---|
| Permittee as filed | USDI, NPS, YOSEMITE |
| NPDES ID | CA0081795 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Federal facility |
| Issued | October 21, 2005 |
| Expiration date | October 21, 2010 |
| Address | Mariposa County, CA 95389 |
| Receiving water | SOUTH FORK OF MERCED RIVER |
| Subwatershed | Snow Creek (HUC 180400080105) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 148Pollutants on file
- 23Under a numeric limit
- 130With a violation of any kind
- 3With 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 148 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Chlorine, total residual | 2 | 6 | 6 | February 28, 2017 | 59,900% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 3 | 3 | January 31, 2017 | 155% over the limit |
| Coliform, total general | 3 | 1 | 1 | December 31, 2017 | 25% over the limit |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | 0 | 2 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 0 | 2 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 0 | 2 | 0 | ||
| Chloroform | 1 | 1 | 0 | ||
| Methyl chloride [Chloromethane] | 1 | 1 | 0 | ||
| Cyanide, total [as CN] | 0 | 1 | 0 | ||
| Asbestos | 0 | 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 | ||
| Silver total recoverable | 0 | 1 | 0 | ||
| Cadmium, total recoverable | 0 | 1 | 0 | ||
| Lead, 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 | ||
| 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 | ||
| Methyl bromide [Bromomethane] | 0 | 1 | 0 | ||
| Methylene chloride | 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 CA0081795.
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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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID CA0081795 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.