Clean Water Act discharge permit · NPDES OR0055000
MCNARY LOCK AND DAM, Umatilla, OR: NPDES OR0055000 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 8Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
MCNARY LOCK AND DAM, held by U.S. Army Corps of Engineers-McNary Lock and Dam, holds NPDES permit OR0055000, which discharges to Columbia River. EPA’s file records it issued July 14, 2025 and expiring June 30, 2030. 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 | MCNARY LOCK AND DAM |
|---|---|
| Permittee as filed | U.S. Army Corps of Engineers-McNary Lock and Dam |
| NPDES ID | OR0055000 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Federal facility |
| Program | Industrial stormwater |
| Issued | July 14, 2025 |
| Expiration date | June 30, 2030 |
| Issuing agency | Oregon Department of Environmental Quality |
| Address | Umatilla, OR 97882 |
| Receiving water | Columbia River |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lake Umatilla (HUC 170701010601) |
| SIC | 4911 – Electric Services |
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
- 8Pollutants on file
- 8Under a numeric limit
- 2With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| pH | 95 | 27 | 27 | June 30, 2026 | |
| Oil & Grease | 68 | 1 | 1 | July 31, 2026 | 200% over the limit |
| Temperature, water deg. centigrade | 95 | 0 | 0 | ||
| Chlorine, total residual | 46 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 44 | 0 | 0 | ||
| Thermal Discharge | 23 | 0 | 0 | ||
| Oil and grease visual | 17 | 0 | 0 | ||
| Alkalinity, total [as CaCO3] | 2 | 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 OR0055000.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, OR0055000.
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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 OR0055000 there.
Nearby on the register
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- Every permit record in Umatilla, A to Z
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- Every permit record in Oregon, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.