Clean Water Act discharge permit · NPDES AZ0026697
BISON RANCH WWTP, Overgaard, AZ: NPDES AZ0026697 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 38Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
BISON RANCH WWTP, held by Bison Ranch Owners Assocation, Inc., holds NPDES permit AZ0026697. EPA’s file records it issued August 23, 2017 and expiring August 22, 2022. 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 | BISON RANCH WWTP |
|---|---|
| Permittee as filed | Bison Ranch Owners Assocation, Inc. |
| NPDES ID | AZ0026697 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | August 23, 2017 |
| Expiration date | August 22, 2022 |
| Address | Overgaard, AZ 85928 |
| Subwatershed | Upper Pierce Wash (HUC 150200100204) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 38Pollutants on file
- 38Under a numeric limit
- 3With 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.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 5 | 22 | 22 | September 30, 2025 | 829% over the limit |
| Copper, total recoverable | 5 | 11 | 11 | June 30, 2026 | 418% over the limit |
| BOD, 5-day, 20 deg. C | 7 | 5 | 5 | January 31, 2019 | 191% over the limit |
| Solids, total suspended | 7 | 0 | 0 | ||
| Oil & Grease | 5 | 0 | 0 | ||
| Cyanide, total [as CN] | 5 | 0 | 0 | ||
| Zinc, total recoverable | 5 | 0 | 0 | ||
| Cadmium, total recoverable | 5 | 0 | 0 | ||
| Lead, total recoverable | 5 | 0 | 0 | ||
| Chlorine, total residual | 5 | 0 | 0 | ||
| pH | 4 | 0 | 0 | ||
| Hydrogen sulfide | 4 | 0 | 0 | ||
| Temperature, water deg. centigrade | 3 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 3 | 0 | 0 | ||
| Iron, total recoverable | 3 | 0 | 0 | ||
| E. coli, colony forming units [CFU] | 3 | 0 | 0 | ||
| Mercury, total recoverable | 3 | 0 | 0 | ||
| Sulfide, total [as S] | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Solids, total dissolved | 2 | 0 | 0 | ||
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | 2 | 0 | 0 | ||
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| TU Static Renewal 7-Day Chronic Pimphales promelas | 2 | 0 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Phosphorus, total [as P] | 1 | 0 | 0 | ||
| Arsenic, 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 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Silver 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 | ||
| Solids, suspended 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 AZ0026697.
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.
Watch this permit
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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 AZ0026697 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.