NPDES WA0029181 · Clean Water Act
KING COUNTY WEST POINT WWTP, Seattle, WA: NPDES WA0029181 discharge permit, effluent exceedances, inspections, penalties
KING COUNTY WEST POINT WWTP, Seattle, Washington: Individual permit WA0029181, held by KING CNTY WASTEWATER TREATMENT DIVISION; Publicly owned treatment works; Administratively continued; issued December 19, 2014, term to January 31, 2020, by State.
- pH, minimum: 5 limits, 55 violations of any kind, 52 effluent exceedances, latest June 30, 2026.
- Coliform, fecal general: 34 limits, 324 violations of any kind, 31 effluent exceedances, latest June 30, 2026, largest 533,168% over the limit.
- Chlorine, total residual: 25 limits, 322 violations of any kind, 29 effluent exceedances, latest June 30, 2026, largest 1,052% over the limit.
- Solids, settleable: 12 limits, 132 violations of any kind, 15 effluent exceedances, latest August 31, 2014, largest 426% over the limit.
- Solids, total suspended: 24 limits, 18 violations of any kind, 14 effluent exceedances, latest November 30, 2017, largest 267% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 8 limits, 11 violations of any kind, 11 effluent exceedances, latest April 30, 2017, largest 338% over the limit.
- Zinc, total [as Zn]: 0 limits, 9 violations of any kind, 7 effluent exceedances, latest June 30, 2026, largest 273% over the limit.
- Solids, suspended percent removal: 9 limits, 141 violations of any kind, 3 effluent exceedances, latest April 30, 2017, largest 260% over the limit.
- Carbonaceous oxygen demand, % removal: 1 limit, 3 violations of any kind, 3 effluent exceedances, latest April 30, 2017, largest 460% over the limit.
- Rainfall duration: 0 limits, 625 violations of any kind.
- Duration of discharge: 0 limits, 558 violations of any kind.
- pH: 20 limits, 291 violations of any kind.
- Precipitation, monthly accumulation: 0 limits, 216 violations of any kind.
- Duration: 1 limit, 98 violations of any kind.
- Nitrite + Nitrate total [as N]: 5 limits, 40 violations of any kind.
- Nitrogen, ammonia total [as N]: 6 limits, 38 violations of any kind.
- Nitrogen, Kjeldahl, total [as N]: 5 limits, 38 violations of any kind.
- Phosphorus, total [as P]: 5 limits, 38 violations of any kind.
- Phosphorus, dissolved reactive [drp as P]: 5 limits, 38 violations of any kind.
- Temperature, water deg. centigrade: 4 limits, 38 violations of any kind.
- Alkalinity, total [as CaCO3]: 4 limits, 38 violations of any kind.
- Oil and grease, hexane extr method: 4 limits, 38 violations of any kind.
- Hardness, total [as CaCO3]: 4 limits, 38 violations of any kind.
- Copper, total [as Cu]: 4 limits, 38 violations of any kind.
- Solids, total dissolved: 4 limits, 38 violations of any kind.
- Oxygen, dissolved [DO]: 4 limits, 36 violations of any kind.
- Flow: 11 limits, 31 violations of any kind.
- Volume, total: 9 limits, 29 violations of any kind.
- Rainfall: 5 limits, 27 violations of any kind.
- Number of Events: 8 limits, 19 violations of any kind.
- Total phenols: 0 limits, 9 violations of any kind.
- Volume: 0 limits, 8 violations of any kind.
- Phenolics, total: 0 limits, 7 violations of any kind.
- BOD, 5-day, 20 deg. C: 20 limits, 6 violations of any kind.
- pH, maximum: 5 limits, 3 violations of any kind.
- Benzofluoranthene: 0 limits, 3 violations of any kind.
- Cyanide, total [as CN]: 0 limits, 2 violations of any kind.
- Arsenic, total [as As]: 0 limits, 2 violations of any kind.
- Beryllium, total [as Be]: 0 limits, 2 violations of any kind.
- Cadmium, total [as Cd]: 0 limits, 2 violations of any kind.
- Chromium, total [as Cr]: 0 limits, 2 violations of any kind.
- Lead, total [as Pb]: 0 limits, 2 violations of any kind.
- Thallium, total [as Tl]: 0 limits, 2 violations of any kind.
- Nickel, total [as Ni]: 0 limits, 2 violations of any kind.
- Silver, total [as Ag]: 0 limits, 2 violations of any kind.
- Antimony, total [as Sb]: 0 limits, 2 violations of any kind.
- Selenium, total [as Se]: 0 limits, 2 violations of any kind.
- Chromium, hexavalent dissolved [as Cr]: 0 limits, 2 violations of any kind.
- Acenaphthylene: 0 limits, 2 violations of any kind.
- Acenaphthene: 0 limits, 2 violations of any kind.
- Anthracene: 0 limits, 2 violations of any kind.
- Benzo[b]fluoranthene: 0 limits, 2 violations of any kind.
- Benzo[k]fluoranthene: 0 limits, 2 violations of any kind.
- Benzo[a]pyrene: 0 limits, 2 violations of any kind.
- Bis[2-chloroethyl] ether: 0 limits, 2 violations of any kind.
- Bis[2-chloroethoxy]methane: 0 limits, 2 violations of any kind.
- Bis[2-chloroisopropyl] ether: 0 limits, 2 violations of any kind.
- Butyl benzyl phthalate: 0 limits, 2 violations of any kind.
- Chrysene: 0 limits, 2 violations of any kind.
- Diethyl phthalate: 0 limits, 2 violations of any kind.
- December 19, 2020: Effluent Violations - Unapproved Bypass (ST6).
- May 20, 2020: Effluent Violations - Unapproved Bypass (ST6).
- November 15, 2019: Effluent Violations - Unapproved Bypass (ST6).
- September 7, 2019: Effluent Violations - Unapproved Bypass (ST6).
- July 19, 2019: Effluent Violations - Unapproved Bypass (ST6).
- March 17, 2019: Effluent Violations - Unapproved Bypass (ST6).
- January 20, 2018: Effluent Violations - Unapproved Bypass (ST6).
- February 16, 2017: WW CSO - Unauthorized CSO Discharge to Waters/Wet Weather (ST6).
- January 18, 2017: WW SSO - Discharge to Waters (ST6).
Washington holds 238 Publicly owned treatment works coverages of this permit type in EPA’s file; 105 were issued before WA0029181.
Coverages issued nearest WA0029181
- 2014-10-16: OROVILLE POTW, Oroville: WA0022390, held by City of Oroville
- 2014-10-24: EDMONDS STP, Edmonds: WA0024058, held by City of Edmonds
- 2014-12-01: ALDERBROOK RESORT & SPA, Union: WA0037753, held by Alderbrook Resort & Spa/North Forty Lodging LLC
- 2014-12-05: PENN COVE WWTP, Oak Harbor: WA0029386, held by PENN COVE WATER & SEWER DIST
- 2014-12-09: SUNNYSIDE POTW, Sunnyside: WA0020991, held by City of Sunnyside
- 2015-01-21: TWISP POTW, Twisp: WA0023370, held by Town of Twisp
- 2015-01-27: OKANOGAN POTW, Okanogan: WA0022365, held by City of Okanogan
- 2015-02-04: OAKESDALE STP, Oakesdale: WA0044792, held by Town Of Oakesdale
- 2015-02-19: PALOUSE STP, Palouse: WA0044806, held by City of Palouse
- 2015-02-26: PATEROS POTW, Pateros: WA0020559, held by City of Pateros
KING COUNTY WEST POINT WWTP among its neighbors
475 discharge permits are in the Lake Washington-Sammamish River subwatershed (HUC 171100120400); WA0029181 is one.
Other permits in the Lake Washington-Sammamish River subwatershed (HUC 171100120400)
- 10400 NE 52ND STREET, Kirkland: WAR127048, minor, term to 2015-12-31
- 11040 MAIN STREET, Bellevue: WAR315164, minor, term to 2025-12-31
- 115 KV LINE SEATTLE, Seattle: WAR303474, minor, term to 2015-12-31
- 120TH AVE NE STAGE 2, Bellevue: WAR302269, minor, term to 2015-12-31
- 120TH AVE NE STAGE 2, Bellevue: WAR302988, minor, term to 2015-12-31
- 120TH AVE NE STAGE 2 - A, Bellevue: WAR302686, minor, term to 2015-12-31
- 124TH AVE NE PEDESTRIAN SAFETY IMPROVEMENTS, Kirkland: WAR313048, minor, term to 2025-12-31
- 145TH STREET AND I5 INTERCHANGE IMPROVEMENTS, Shoreline: WAR312278, minor, term to 2025-12-31
- 150TH AVENUE SE AT I90 ROADWAY PROJECT, Bellevue: WAR314605, minor, term to 2025-12-31
- 1740 NW MARKET ST, Seattle: WAR315491, minor, term to 2030-12-31
Identity
| Facility | KING COUNTY WEST POINT WWTP |
|---|---|
| Permittee | KING CNTY WASTEWATER TREATMENT DIVISION |
| NPDES ID | WA0029181 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Major |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 19, 2014 |
| Expires | January 31, 2020 |
| Agency | State |
| Address | Seattle, WA 98199 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lake Washington-Sammamish River (HUC 171100120400) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler WAD988471413; ICIS-AIR source WAPSC0005303300138 |
NPDES WA0029181: effluent limits and exceedances
KING COUNTY WEST POINT WWTP (NPDES WA0029181): 169 pollutants on file, 28 limited; 169 with a violation of any kind, 9 with an exceedance.
The 60 with the most exceedances of the 169 on file for NPDES WA0029181. How exceedances are counted.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| pH, minimum | 5 | 55 | 52 | June 30, 2026 | |
| Coliform, fecal general | 34 | 324 | 31 | June 30, 2026 | 533,168% over the limit |
| Chlorine, total residual | 25 | 322 | 29 | June 30, 2026 | 1,052% over the limit |
| Solids, settleable | 12 | 132 | 15 | August 31, 2014 | 426% over the limit |
| Solids, total suspended | 24 | 18 | 14 | November 30, 2017 | 267% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 11 | 11 | April 30, 2017 | 338% over the limit |
| Zinc, total [as Zn] | 0 | 9 | 7 | June 30, 2026 | 273% over the limit |
| Solids, suspended percent removal | 9 | 141 | 3 | April 30, 2017 | 260% over the limit |
| Carbonaceous oxygen demand, % removal | 1 | 3 | 3 | April 30, 2017 | 460% over the limit |
| Rainfall duration | 0 | 625 | 0 | ||
| Duration of discharge | 0 | 558 | 0 | ||
| pH | 20 | 291 | 0 | ||
| Precipitation, monthly accumulation | 0 | 216 | 0 | ||
| Duration | 1 | 98 | 0 | ||
| Nitrite + Nitrate total [as N] | 5 | 40 | 0 | ||
| Nitrogen, ammonia total [as N] | 6 | 38 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 5 | 38 | 0 | ||
| Phosphorus, total [as P] | 5 | 38 | 0 | ||
| Phosphorus, dissolved reactive [drp as P] | 5 | 38 | 0 | ||
| Temperature, water deg. centigrade | 4 | 38 | 0 | ||
| Alkalinity, total [as CaCO3] | 4 | 38 | 0 | ||
| Oil and grease, hexane extr method | 4 | 38 | 0 | ||
| Hardness, total [as CaCO3] | 4 | 38 | 0 | ||
| Copper, total [as Cu] | 4 | 38 | 0 | ||
| Solids, total dissolved | 4 | 38 | 0 | ||
| Oxygen, dissolved [DO] | 4 | 36 | 0 | ||
| Flow | 11 | 31 | 0 | ||
| Volume, total | 9 | 29 | 0 | ||
| Rainfall | 5 | 27 | 0 | ||
| Number of Events | 8 | 19 | 0 | ||
| Total phenols | 0 | 9 | 0 | ||
| Volume | 0 | 8 | 0 | ||
| Phenolics, total | 0 | 7 | 0 | ||
| BOD, 5-day, 20 deg. C | 20 | 6 | 0 | ||
| pH, maximum | 5 | 3 | 0 | ||
| Benzofluoranthene | 0 | 3 | 0 | ||
| Cyanide, total [as CN] | 0 | 2 | 0 | ||
| Arsenic, total [as As] | 0 | 2 | 0 | ||
| Beryllium, total [as Be] | 0 | 2 | 0 | ||
| Cadmium, total [as Cd] | 0 | 2 | 0 | ||
| Chromium, total [as Cr] | 0 | 2 | 0 | ||
| Lead, total [as Pb] | 0 | 2 | 0 | ||
| Thallium, total [as Tl] | 0 | 2 | 0 | ||
| Nickel, total [as Ni] | 0 | 2 | 0 | ||
| Silver, total [as Ag] | 0 | 2 | 0 | ||
| Antimony, total [as Sb] | 0 | 2 | 0 | ||
| Selenium, total [as Se] | 0 | 2 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 0 | 2 | 0 | ||
| Acenaphthylene | 0 | 2 | 0 | ||
| Acenaphthene | 0 | 2 | 0 | ||
| Anthracene | 0 | 2 | 0 | ||
| Benzo[b]fluoranthene | 0 | 2 | 0 | ||
| Benzo[k]fluoranthene | 0 | 2 | 0 | ||
| Benzo[a]pyrene | 0 | 2 | 0 | ||
| Bis[2-chloroethyl] ether | 0 | 2 | 0 | ||
| Bis[2-chloroethoxy]methane | 0 | 2 | 0 | ||
| Bis[2-chloroisopropyl] ether | 0 | 2 | 0 | ||
| Butyl benzyl phthalate | 0 | 2 | 0 | ||
| Chrysene | 0 | 2 | 0 | ||
| Diethyl phthalate | 0 | 2 | 0 |
NPDES WA0029181: inspections, violations and enforcement
NPDES WA0029181: 9 single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 19, 2020 | Effluent Violations - Unapproved Bypass | ST6 |
| May 20, 2020 | Effluent Violations - Unapproved Bypass | ST6 |
| November 15, 2019 | Effluent Violations - Unapproved Bypass | ST6 |
| September 7, 2019 | Effluent Violations - Unapproved Bypass | ST6 |
| July 19, 2019 | Effluent Violations - Unapproved Bypass | ST6 |
| March 17, 2019 | Effluent Violations - Unapproved Bypass | ST6 |
| January 20, 2018 | Effluent Violations - Unapproved Bypass | ST6 |
| February 16, 2017 | WW CSO - Unauthorized CSO Discharge to Waters/Wet Weather | ST6 |
| January 18, 2017 | WW SSO - Discharge to Waters | ST6 |
NPDES WA0029181 (KING COUNTY WEST POINT WWTP): no inspection, formal enforcement action and informal enforcement action on file.
Watch NPDES WA0029181
NPDES WA0029181: one email when its EPA record changes — $99/month.
Permits near NPDES WA0029181
NPDES WA0029181: 169 pollutant rows, 9 dated events; ICIS-NPDES download, loaded October 14, 2026.