Clean Water Act discharge permit · NPDES WA0991029
PUD NO 2 GRANT COUNTY PRIEST RAPIDS DAM, Mattawa, WA: NPDES WA0991029 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 25Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
PUD NO 2 GRANT COUNTY PRIEST RAPIDS DAM, held by Grant PUD @ Wanapum/Priest, holds NPDES permit WA0991029. EPA’s file records it issued July 15, 2022 and expiring August 31, 2027. 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 | PUD NO 2 GRANT COUNTY PRIEST RAPIDS DAM |
|---|---|
| Permittee as filed | Grant PUD @ Wanapum/Priest |
| NPDES ID | WA0991029 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 15, 2022 |
| Expiration date | August 31, 2027 |
| Issuing agency | State |
| Address | Mattawa, WA 99349 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | McCoy Canyon-Columbia River (HUC 170200160106) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 25Pollutants on file
- 25Under a numeric limit
- 1With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| Phenolics, total | 2 | 6 | 0 | ||
| Temperature, water deg. centigrade | 39 | 0 | 0 | ||
| Net rate of additionof heat | 14 | 0 | 0 | ||
| Flow | 13 | 0 | 0 | ||
| pH | 6 | 0 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 0 | 0 | ||
| Cyanide, weak acid, dissociable | 2 | 0 | 0 | ||
| Cyanide, total [as CN] | 2 | 0 | 0 | ||
| Cyanide, free [amenable to chlorination] | 2 | 0 | 0 | ||
| Arsenic, total [as As] | 2 | 0 | 0 | ||
| Beryllium, total [as Be] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Chromium, total [as Cr] | 2 | 0 | 0 | ||
| Copper, total [as Cu] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Thallium, total [as Tl] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Silver, total [as Ag] | 2 | 0 | 0 | ||
| Zinc, total [as Zn] | 2 | 0 | 0 | ||
| Antimony, total [as Sb] | 2 | 0 | 0 | ||
| Selenium, total [as Se] | 2 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 2 | 0 | 0 | ||
| Total phenols | 2 | 0 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 2 | 0 | 0 | ||
| Mercury, total [as Hg] | 2 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES WA0991029.
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 WA0991029.
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 WA0991029 there.
Nearby on the register
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- Every permit record in Washington, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.