NPDES WA0023281 · Clean Water Act
WILKESON STP, Wilkeson, WA: NPDES WA0023281 discharge permit, effluent exceedances, inspections, penalties
WILKESON STP, Wilkeson, Washington: Individual permit WA0023281, held by TOWN OF WILKESON; Publicly owned treatment works; Administratively continued; issued July 1, 2010, term to July 31, 2015, by State.
- Solids, suspended percent removal: 0 limits, 9 violations of any kind, 7 effluent exceedances, latest December 31, 2024, largest 93% over the limit.
- Solids, total suspended: 0 limits, 17 violations of any kind, 1 effluent exceedance, latest January 31, 2022, largest 22% over the limit.
- Nitrogen, ammonia total [as N]: 0 limits, 5 violations of any kind, 1 effluent exceedance, latest December 31, 2013, largest 71% over the limit.
- Coliform, fecal general: 0 limits, 5 violations of any kind, 1 effluent exceedance, latest December 31, 2024, largest 21% over the limit.
- pH: 0 limits, 114 violations of any kind.
- BOD, percent removal [total]: 0 limits, 91 violations of any kind.
- Temperature, water deg. centigrade: 0 limits, 37 violations of any kind.
- BOD, 5-day, 20 deg. C: 0 limits, 32 violations of any kind.
- Flow: 0 limits, 8 violations of any kind.
- Rainfall: 0 limits, 4 violations of any kind.
- Nitrogen, nitrite total [as N]: 0 limits, 3 violations of any kind.
- Nitrogen, nitrate total [as N]: 0 limits, 3 violations of any kind.
- Nitrogen, Kjeldahl, total [as N]: 0 limits, 3 violations of any kind.
- Phosphate, total [as PO4]: 0 limits, 3 violations of any kind.
- Phosphorus, total [as P]: 0 limits, 3 violations of any kind.
- November 3, 2026: Letter of Violation/ Warning Letter (State).
- October 22, 2026: Evaluation (S).
- September 29, 2026: Letter of Violation/ Warning Letter (State).
- June 29, 2026: Evaluation (S).
- March 4, 2026: Letter of Violation/ Warning Letter (State).
- February 25, 2026: Evaluation (S).
- February 25, 2026: Agency Enforcement Review (State).
- January 26, 2026: Evaluation (S).
- January 6, 2026: Evaluation (S).
Washington holds 238 Publicly owned treatment works coverages of this permit type in EPA’s file; 36 were issued before WA0023281.
Coverages issued nearest WA0023281
- 2010-06-28: REARDAN STP, Reardan: WA0045306, held by Town of Reardan
- 2010-06-29: ALBION STP, Albion: WA0022608, held by Town of Albion
- 2010-06-29: ENDICOTT STP, Endicott: WA0023981, held by Town of Endicott
- 2010-06-29: GARFIELD STP, Garfield: WA0044822, held by Town of Garfield
- 2010-06-29: PASCO WWTP, Pasco: WA0044962, held by City of Pasco
- 2010-07-16: GRANDVIEW POTW, Grandview: WA0052205, held by City of Grandview
- 2010-07-29: WENATCHEE POTW, Wenatchee: WA0023949, held by City of Wenatchee
- 2010-10-06: TACOMA CENTRAL NO 1, Tacoma: WA0037087, held by City of Tacoma
- 2010-10-26: COLFAX STP, Colfax: WA0020613, held by City Of Colfax
- 2010-11-18: DOUGLAS COUNTY SEWER DISTRICT WWTP, East Wenatchee: WA0020621, held by Douglas Co Sewer District #1
WILKESON STP among its neighbors
3 discharge permits are in the Wilkeson Creek subwatershed (HUC 171100140103); WA0023281 is one. Its county: 662, 9 major; WA0023281 is minor permit.
Other permits in the Wilkeson Creek subwatershed (HUC 171100140103)
- WILKESON CREEK REARING PONDS, Buckley: WAG130042, minor, term to 2029-02-28
- WILKESON SANDSTONE QUARRY, Wilkeson: WAG501471, minor, term to 2026-03-31
Identity
| Facility | WILKESON STP |
|---|---|
| Permittee | TOWN OF WILKESON |
| NPDES ID | WA0023281 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Minor |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 1, 2010 |
| Expires | July 31, 2015 |
| Agency | State |
| Address | Wilkeson, WA 98396 |
| Subwatershed | Wilkeson Creek (HUC 171100140103) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
NPDES WA0023281: effluent limits and exceedances
WILKESON STP (NPDES WA0023281): 15 pollutants on file, 0 limited; 15 with a violation of any kind, 4 with an exceedance.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| Solids, suspended percent removal | 0 | 9 | 7 | December 31, 2024 | 93% over the limit |
| Solids, total suspended | 0 | 17 | 1 | January 31, 2022 | 22% over the limit |
| Nitrogen, ammonia total [as N] | 0 | 5 | 1 | December 31, 2013 | 71% over the limit |
| Coliform, fecal general | 0 | 5 | 1 | December 31, 2024 | 21% over the limit |
| pH | 0 | 114 | 0 | ||
| BOD, percent removal [total] | 0 | 91 | 0 | ||
| Temperature, water deg. centigrade | 0 | 37 | 0 | ||
| BOD, 5-day, 20 deg. C | 0 | 32 | 0 | ||
| Flow | 0 | 8 | 0 | ||
| Rainfall | 0 | 4 | 0 | ||
| Nitrogen, nitrite total [as N] | 0 | 3 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 3 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 3 | 0 | ||
| Phosphate, total [as PO4] | 0 | 3 | 0 | ||
| Phosphorus, total [as P] | 0 | 3 | 0 |
NPDES WA0023281: inspections, violations and enforcement
NPDES WA0023281: 5 inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| October 22, 2026 | Evaluation | S |
| June 29, 2026 | Evaluation | S |
| February 25, 2026 | Evaluation | S |
| January 26, 2026 | Evaluation | S |
| January 6, 2026 | Evaluation | S |
NPDES WA0023281: 4 informal enforcement actions
| Date | What EPA recorded | Agency |
|---|---|---|
| November 3, 2026 | Letter of Violation/ Warning Letter | State |
| September 29, 2026 | Letter of Violation/ Warning Letter | State |
| March 4, 2026 | Letter of Violation/ Warning Letter | State |
| February 25, 2026 | Agency Enforcement Review | State |
NPDES WA0023281 (WILKESON STP): no single-event violation and formal enforcement action on file.
Watch NPDES WA0023281
NPDES WA0023281: one email when its EPA record changes — $99/month.
Permits near NPDES WA0023281
NPDES WA0023281: 15 pollutant rows, 9 dated events; ICIS-NPDES download, loaded October 14, 2026.