Clean Water Act discharge permit · NPDES AZ0022152
USDOI NPS - GRAND CANYON NP - SOUTH RIM WWTP, Grand Canyon, AZ: NPDES AZ0022152 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 124Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
USDOI NPS - GRAND CANYON NP - SOUTH RIM WWTP, held by Usdoi Nps - Grand Canyon Np, holds NPDES permit AZ0022152. EPA’s file records it issued January 19, 2018 and expiring January 18, 2023. 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 | USDOI NPS - GRAND CANYON NP - SOUTH RIM WWTP |
|---|---|
| Permittee as filed | Usdoi Nps - Grand Canyon Np |
| NPDES ID | AZ0022152 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Federal facility |
| Program | Publicly owned treatment works |
| Issued | January 19, 2018 |
| Expiration date | January 18, 2023 |
| Address | Grand Canyon, AZ 86023 |
| Subwatershed | Bright Angel Wash (HUC 150100040801) |
| 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
- 158Pollutants on file
- 124Under a numeric limit
- 148With 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 158 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 3 | 22 | 17 | June 30, 2026 | 2,157% over the limit |
| Chlorine, total residual | 5 | 24 | 15 | August 31, 2012 | 400% over the limit |
| pH | 4 | 13 | 11 | August 31, 2008 | |
| Copper, total recoverable | 5 | 14 | 9 | December 31, 2021 | 62% over the limit |
| Selenium, total recoverable | 5 | 10 | 5 | June 30, 2011 | 144% over the limit |
| Cyanide, total recoverable | 0 | 8 | 3 | December 31, 2006 | 202% over the limit |
| Cyanide, total [as CN] | 5 | 1 | 1 | December 31, 2018 | 39% over the limit |
| Solids, total suspended | 7 | 16 | 0 | ||
| BOD, 5-day, 20 deg. C | 7 | 14 | 0 | ||
| E. coli | 2 | 6 | 0 | ||
| Zinc, total recoverable | 5 | 5 | 0 | ||
| Cadmium, total recoverable | 1 | 5 | 0 | ||
| Lead, total recoverable | 1 | 5 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 2 | 0 | ||
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | 2 | 2 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 2 | 2 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 2 | 2 | 0 | ||
| Solids, total dissolved | 7 | 1 | 0 | ||
| Silver total recoverable | 5 | 1 | 0 | ||
| Oil & Grease | 3 | 1 | 0 | ||
| Mercury, total recoverable | 3 | 1 | 0 | ||
| Sulfide, total [as S] | 2 | 1 | 0 | ||
| Temperature, water deg. centigrade | 1 | 1 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 1 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 1 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 1 | 0 | ||
| Phosphorus, total [as P] | 1 | 1 | 0 | ||
| Arsenic, total recoverable | 1 | 1 | 0 | ||
| Thallium, total recoverable | 1 | 1 | 0 | ||
| Beryllium, total recoverable [as Be] | 1 | 1 | 0 | ||
| Nickel, total recoverable | 1 | 1 | 0 | ||
| Chromium, total recoverable | 1 | 1 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 1 | 1 | 0 | ||
| Antimony, total recoverable | 1 | 1 | 0 | ||
| Dichlorobromomethane | 1 | 1 | 0 | ||
| Carbon tetrachloride | 1 | 1 | 0 | ||
| Bromoform | 1 | 1 | 0 | ||
| Chloroform | 1 | 1 | 0 | ||
| Toluene | 1 | 1 | 0 | ||
| Benzene | 1 | 1 | 0 | ||
| Acenaphthylene | 1 | 1 | 0 | ||
| Acenaphthene | 1 | 1 | 0 | ||
| Acrolein | 1 | 1 | 0 | ||
| Acrylonitrile | 1 | 1 | 0 | ||
| Anthracene | 1 | 1 | 0 | ||
| Benzo[k]fluoranthene | 1 | 1 | 0 | ||
| Benzo[a]pyrene | 1 | 1 | 0 | ||
| Bis[2-chloroethyl] ether | 1 | 1 | 0 | ||
| Bis[2-chloroethoxy]methane | 1 | 1 | 0 | ||
| Bis[2-chloroisopropyl] ether | 1 | 1 | 0 | ||
| Butyl benzyl phthalate | 1 | 1 | 0 | ||
| Chlorobenzene | 1 | 1 | 0 | ||
| Chrysene | 1 | 1 | 0 | ||
| Diethyl phthalate | 1 | 1 | 0 | ||
| Dimethyl phthalate | 1 | 1 | 0 | ||
| 1,2-Diphenylhydrazine | 1 | 1 | 0 | ||
| Ethylbenzene | 1 | 1 | 0 | ||
| Fluoranthene | 1 | 1 | 0 | ||
| Fluorene | 1 | 1 | 0 | ||
| Hexachlorocyclopentadiene | 1 | 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 AZ0022152.
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 AZ0022152 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.