Clean Water Act discharge permit · NPDES AZ0025160
USDOI BR - HOOVER DAM WWTP, Boulder City, NV: NPDES AZ0025160 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 38Pollutants under a numeric limit
- 10Pollutants with an effluent exceedance
USDOI BR - HOOVER DAM WWTP, held by Usdoi - Lower Colorado, holds NPDES permit AZ0025160. EPA’s file records it issued August 2, 2019 and expiring August 1, 2024. 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 | USDOI BR - HOOVER DAM WWTP |
|---|---|
| Permittee as filed | Usdoi - Lower Colorado |
| NPDES ID | AZ0025160 |
| 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 |
| Program | Publicly owned treatment works |
| Issued | August 2, 2019 |
| Expiration date | August 1, 2024 |
| Address | Boulder City, NV 89005 |
| Subwatershed | White Rock Canyon-Colorado River (HUC 150301010101) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 39Pollutants on file
- 38Under a numeric limit
- 15With a violation of any kind
- 10With 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.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Solids, total dissolved | 7 | 18 | 12 | June 30, 2019 | 63% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 5 | 3 | April 30, 2026 | 45% over the limit |
| Solids, total suspended | 7 | 2 | 2 | March 31, 2017 | 3% over the limit |
| Iron, total recoverable | 5 | 2 | 2 | December 31, 2022 | 59% over the limit |
| E. coli, colony forming units [CFU] | 3 | 2 | 2 | December 31, 2023 | 561% over the limit |
| Copper, total recoverable | 1 | 2 | 2 | December 31, 2015 | 58% over the limit |
| Nitrogen, nitrate total [as NO3] | 0 | 2 | 2 | June 30, 2015 | 4,700% over the limit |
| Selenium, total recoverable | 5 | 1 | 1 | June 30, 2026 | 110% over the limit |
| Chlorine, total residual | 5 | 1 | 1 | October 31, 2019 | 11% over the limit |
| Solids, suspended percent removal | 1 | 1 | 1 | May 31, 2020 | 4% over the limit |
| Sulfide, total [as S] | 2 | 2 | 0 | ||
| Hydrogen sulfide | 2 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 2 | 0 | ||
| Phosphorus, total [as P] | 1 | 2 | 0 | ||
| BOD, 5-day, 20 deg. C | 7 | 0 | 0 | ||
| pH | 6 | 0 | 0 | ||
| Oil & Grease | 5 | 0 | 0 | ||
| Lead, total recoverable | 5 | 0 | 0 | ||
| Mercury, total recoverable | 5 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 0 | 0 | ||
| Temperature, water deg. centigrade | 3 | 0 | 0 | ||
| Cyanide, total [as CN] | 3 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 3 | 0 | 0 | ||
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | 2 | 0 | 0 | ||
| Static 7Day Chronic Pimephales Promelas | 2 | 0 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 0 | 0 | ||
| Arsenic, total recoverable | 1 | 0 | 0 | ||
| Thallium, total recoverable | 1 | 0 | 0 | ||
| Beryllium, total recoverable [as Be] | 1 | 0 | 0 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Silver total recoverable | 1 | 0 | 0 | ||
| Zinc, total recoverable | 1 | 0 | 0 | ||
| Cadmium, total recoverable | 1 | 0 | 0 | ||
| Chromium, total recoverable | 1 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 1 | 0 | 0 | ||
| Antimony, total recoverable | 1 | 0 | 0 | ||
| BOD, 5-day, percent removal | 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 AZ0025160.
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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 AZ0025160 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.