Clean Water Act discharge permit · NPDES OR0044717
IMTWAHA FISH HATCHERY, Umatilla, OR: NPDES OR0044717 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
IMTWAHA FISH HATCHERY, held by Confederated Tribes of the Umatilla Indian Reservation, holds NPDES permit OR0044717. EPA’s file records it issued December 11, 2019 and expiring November 30, 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 | IMTWAHA FISH HATCHERY |
|---|---|
| Permittee as filed | Confederated Tribes of the Umatilla Indian Reservation |
| NPDES ID | OR0044717 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 11, 2019 |
| Expiration date | November 30, 2024 |
| Address | Umatilla, OR 97862 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lower South Fork Walla Walla River (HUC 170701020103) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 13Pollutants on file
- 13Under a numeric limit
- 13With a violation of any kind
- 1With 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 suspended | 6 | 74 | 6 | May 31, 2026 | 840% over the limit |
| Temperature, water deg. centigrade | 7 | 153 | 0 | ||
| pH | 5 | 101 | 0 | ||
| Excess thermal load | 5 | 101 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 94 | 0 | ||
| pH range excursions, > 60 minutes | 2 | 52 | 0 | ||
| pH range excursions, monthly total accum | 2 | 51 | 0 | ||
| Nitrogen, ammonia total [as N] | 3 | 10 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 8 | 0 | ||
| Oxygen, dissolved [DO] | 3 | 7 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 3 | 7 | 0 | ||
| Solids, settleable | 2 | 5 | 0 | ||
| Alkalinity, total [as CaCO3] | 3 | 3 | 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
- 8Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 15, 2026 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| November 16, 2025 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| June 26, 2024 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| June 20, 2024 | Monitoring Violations - Analysis not Conducted | ST6 |
| October 1, 2023 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| November 15, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| May 15, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| October 1, 2021 | Monitoring Violations - Analysis not Conducted | ST6 |
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 OR0044717 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.