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Clean Water Act discharge permit · NPDES WA0050229

WAPATO, CITY OF - WAPATO WWTP, Wapato, WA: NPDES WA0050229 discharge permit, effluent exceedances, inspections, penalties

WAPATO, CITY OF - WAPATO WWTP, held by WAPATO, CITY OF, holds NPDES permit WA0050229, which discharges to Yakima River Via Drainage Ditch #2. EPA’s file records it issued September 12, 2011 and expiring October 31, 2016.

WAPATO, CITY OF - WAPATO WWTP, Wapato, Washington: Individual permit WA0050229, held by WAPATO, CITY OF; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 12, 2011, term to October 31, 2016; discharges to YAKIMA RIVER VIA DRAINAGE DITCH #2; Sewage Treatment Facilities.

  • Zinc, total recoverable: 8 limits, 1,064 violations of any kind, 1,016 effluent exceedances, latest July 31, 2026, largest 136,817% over the limit.
  • Nitrogen, ammonia total [as N]: 8 limits, 198 violations of any kind, 142 effluent exceedances, latest May 31, 2026, largest 2,900% over the limit.
  • Copper, total recoverable: 8 limits, 109 violations of any kind, 61 effluent exceedances, latest September 30, 2023, largest 277% over the limit.
  • Coliform, fecal MF, MFC broth, 44.5 C: 0 limits, 6 violations of any kind, 3 effluent exceedances, latest November 30, 1998, largest 330% over the limit.
  • pH: 2 limits, 30 violations of any kind, 2 effluent exceedances, latest July 31, 2008.
  • E. coli, MTEC-MF: 2 limits, 26 violations of any kind, 2 effluent exceedances, latest July 31, 2025, largest 233% over the limit.
  • Chlorine, total residual: 4 limits, 557 violations of any kind, 1 effluent exceedance, latest May 31, 1998, largest 100% over the limit.
  • BOD, 5-day, 20 deg. C: 5 limits, 66 violations of any kind, 1 effluent exceedance, latest March 31, 2003, largest 14% over the limit.
  • Solids, suspended percent removal: 1 limit, 14 violations of any kind, 1 effluent exceedance, latest June 30, 2015, largest 27% over the limit.
  • Toxicity [acute], Ceriodaphnia dubia: 8 limits, 186 violations of any kind, 0 effluent exceedances.
  • Toxicity [acute], Pimephales promelas [Fathead Minnow]: 8 limits, 186 violations of any kind, 0 effluent exceedances.
  • Mercury, total recoverable: 2 limits, 74 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 5 limits, 65 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 1 limit, 33 violations of any kind, 0 effluent exceedances.
  • Flow, in conduit or thru treatment plant: 2 limits, 27 violations of any kind, 0 effluent exceedances.
  • Nitrogen, total [as N]: 1 limit, 25 violations of any kind, 0 effluent exceedances.
  • Cadmium, total recoverable: 1 limit, 25 violations of any kind, 0 effluent exceedances.
  • Temperature, water deg. centigrade: 1 limit, 14 violations of any kind, 0 effluent exceedances.
  • BOD, 5-day, percent removal: 1 limit, 14 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 1 limit, 13 violations of any kind, 0 effluent exceedances.
  • PER-AND POLYFLUOROALKYL SUBSTANCES: 0 limits, 6 violations of any kind, 0 effluent exceedances.
  • September 30, 2026: Evaluation (E).

Washington holds 238 Publicly owned treatment works coverages of this permit type in EPA’s file; 51 were issued before WA0050229. WAPATO, CITY OF holds 2 permits in Washington.

Other permits held by WAPATO, CITY OF

Coverages issued nearest WA0050229

WAPATO, CITY OF - WAPATO WWTP among its neighbors

EPA’s permit file holds 8 discharge permits in the Wanity Slough-Marion Drain subwatershed (HUC 170300030403), WA0050229 among them. Its county holds 169, 3 of them major permits; WA0050229 is a minor permit.

Other permits in the Wanity Slough-Marion Drain subwatershed (HUC 170300030403)

Identity

Facility as filedWAPATO, CITY OF - WAPATO WWTP
Permittee as filedWAPATO, CITY OF
NPDES IDWA0050229
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedSeptember 12, 2011
Expiration dateOctober 31, 2016
AddressWapato, WA 98951
Receiving waterYAKIMA RIVER VIA DRAINAGE DITCH #2
SubwatershedWanity Slough-Marion Drain (HUC 170300030403)
Program components on fileBiosolids, POTW
NAICS221320 – Sewage Treatment Facilities
SIC4952 – Sewerage Systems

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Zinc, total recoverable81,0641,016July 31, 2026136,817% over the limit
Nitrogen, ammonia total [as N]8198142May 31, 20262,900% over the limit
Copper, total recoverable810961September 30, 2023277% over the limit
Coliform, fecal MF, MFC broth, 44.5 C063November 30, 1998330% over the limit
pH2302July 31, 2008
E. coli, MTEC-MF2262July 31, 2025233% over the limit
Chlorine, total residual45571May 31, 1998100% over the limit
BOD, 5-day, 20 deg. C5661March 31, 200314% over the limit
Solids, suspended percent removal1141June 30, 201527% over the limit
Toxicity [acute], Ceriodaphnia dubia81860
Toxicity [acute], Pimephales promelas [Fathead Minnow]81860
Mercury, total recoverable2740
Solids, total suspended5650
Phosphorus, total [as P]1330
Flow, in conduit or thru treatment plant2270
Nitrogen, total [as N]1250
Cadmium, total recoverable1250
Temperature, water deg. centigrade1140
BOD, 5-day, percent removal1140
Oxygen, dissolved [DO]1130
PER-AND POLYFLUOROALKYL SUBSTANCES060

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES WA0050229.

Inspections

DateWhat EPA recordedAgency
September 30, 2026EvaluationE

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES WA0050229.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This page covers the NPDES discharge permit WA0050229 held by WAPATO, CITY OF for the WAPATO WWTP in Wapato, WA, with the permit administratively continued after its October 31, 2016 expiration. The figures listed are 19 pollutants under a numeric limit and 9 pollutants with an effluent exceedance, and the facility is classed as a Minor Discharger.