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Clean Water Act discharge permit · NPDES WA0022667

CATHLAMET STP, Cathlamet, WA: NPDES WA0022667 discharge permit, effluent exceedances, inspections, penalties

CATHLAMET STP, held by Town of Cathlamet, holds NPDES permit WA0022667. EPA’s file records it issued April 12, 2022 and expiring April 30, 2027.

CATHLAMET STP, Cathlamet, Washington: Individual permit WA0022667, held by Town of Cathlamet; Publicly owned treatment works; Effective; issued April 12, 2022, term to April 30, 2027, by State.

  • Solids, suspended percent removal: 0 limits, 132 violations of any kind, 131 effluent exceedances, latest December 31, 2024, largest 172% over the limit.
  • BOD, percent removal [total]: 0 limits, 127 violations of any kind, 126 effluent exceedances, latest April 30, 2022, largest 98% over the limit.
  • pH, maximum: 0 limits, 11 violations of any kind, 11 effluent exceedances, latest September 30, 2011.
  • BOD, 5-day, 20 deg. C: 0 limits, 17 violations of any kind, 9 effluent exceedances, latest November 30, 2011, largest 318% over the limit.
  • Solids, total suspended: 0 limits, 17 violations of any kind, 9 effluent exceedances, latest December 31, 2015, largest 99,999% over the limit.
  • Coliform, fecal general: 0 limits, 6 violations of any kind, 4 effluent exceedances, latest December 31, 2012, largest 100% over the limit.
  • Fecal coliform, MPN, EC med, 44.5 C: 0 limits, 4 violations of any kind, 4 effluent exceedances, latest June 30, 2009, largest 190% over the limit.
  • pH: 0 limits, 47 violations of any kind, 3 effluent exceedances, latest November 30, 2013.
  • Chlorine, total residual: 0 limits, 10 violations of any kind, 0 effluent exceedances.
  • Flow: 0 limits, 3 violations of any kind, 0 effluent exceedances.
  • Temperature, water deg. centigrade: 0 limits, 2 violations of any kind, 0 effluent exceedances.
  • Nitrogen, ammonia total [as N]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
  • January 13, 2026: Evaluation (S).

Washington holds 238 Publicly owned treatment works coverages of this permit type in EPA’s file; 236 were issued before WA0022667. Town of Cathlamet holds 2 permits in Washington.

Other permits held by Town of Cathlamet

Coverages issued nearest WA0022667

CATHLAMET STP among its neighbors

EPA’s permit file holds 20 discharge permits in the Cathlamet Channel-Columbia River subwatershed (HUC 170800030700), WA0022667 among them. Its county holds 7, 0 of them major permits; WA0022667 is a minor permit.

Other permits in the Cathlamet Channel-Columbia River subwatershed (HUC 170800030700)

Identity

Facility as filedCATHLAMET STP
Permittee as filedTown of Cathlamet
NPDES IDWA0022667
Permit statusEffective
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedApril 12, 2022
Expiration dateApril 30, 2027
Issuing agencyState
AddressCathlamet, WA 98612
Receiving water impaired303(D) Listed
SubwatershedCathlamet Channel-Columbia River (HUC 170800030700)

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
Solids, suspended percent removal0132131December 31, 2024172% over the limit
BOD, percent removal [total]0127126April 30, 202298% over the limit
pH, maximum01111September 30, 2011
BOD, 5-day, 20 deg. C0179November 30, 2011318% over the limit
Solids, total suspended0179December 31, 201599,999% over the limit
Coliform, fecal general064December 31, 2012100% over the limit
Fecal coliform, MPN, EC med, 44.5 C044June 30, 2009190% over the limit
pH0473November 30, 2013
Chlorine, total residual0100
Flow030
Temperature, water deg. centigrade020
Nitrogen, ammonia total [as N]020

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES WA0022667.

Inspections

DateWhat EPA recordedAgency
January 13, 2026EvaluationS

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 WA0022667.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

This public-records page covers NPDES permit WA0022667 for the CATHLAMET STP in Cathlamet, WA, held by the Town of Cathlamet, with its status as of September 15, 2026. The permit lists 12 pollutants on file, 8 of which have an effluent exceedance, and the Cathlamet Channel-Columbia River subwatershed (HUC 170800030700) is noted as a 303(D) listed receiving water.