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Clean Water Act discharge permit · NPDES WA0023175

COLTON STP, Colton, WA: NPDES WA0023175 discharge permit, effluent exceedances, inspections, penalties

COLTON STP, held by Town of Colton, holds NPDES permit WA0023175. EPA’s file records it issued May 6, 2015 and expiring May 31, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedCOLTON STP
Permittee as filedTown of Colton
NPDES IDWA0023175
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
IssuedMay 6, 2015
Expiration dateMay 31, 2020
Issuing agencyState
AddressColton, WA 99113
SubwatershedTown of Colton-Union Flat Creek (HUC 170601080404)
Program components on filePOTW, Pretreatment
SIC4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

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, total suspended0197185April 30, 2026377% over the limit
Solids, suspended percent removal06060April 30, 2026670% over the limit
BOD, 5-day, 20 deg. C05353April 30, 2026112% over the limit
BOD, percent removal [total]011029April 30, 2026440% over the limit
Coliform, fecal general02828January 31, 2026883% over the limit
pH02020April 30, 2026
Chlorine, total residual066December 31, 201627% over the limit

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES WA0023175.

Inspections

DateWhat EPA recordedAgency
April 29, 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

DateWhat EPA recordedAgency
April 14, 2026Agency Enforcement ReviewState
March 26, 2026Agency Enforcement ReviewState
February 13, 2026Agency Enforcement ReviewState

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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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 WA0023175 there.

COLTON STP, Colton, Washington: Individual permit WA0023175, held by Town of Colton; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued May 6, 2015, term to May 31, 2020, by State.

  • Solids, total suspended: 0 limits, 197 violations of any kind, 185 effluent exceedances, latest April 30, 2026, largest 377% over the limit.
  • Solids, suspended percent removal: 0 limits, 60 violations of any kind, 60 effluent exceedances, latest April 30, 2026, largest 670% over the limit.
  • BOD, 5-day, 20 deg. C: 0 limits, 53 violations of any kind, 53 effluent exceedances, latest April 30, 2026, largest 112% over the limit.
  • BOD, percent removal [total]: 0 limits, 110 violations of any kind, 29 effluent exceedances, latest April 30, 2026, largest 440% over the limit.
  • Coliform, fecal general: 0 limits, 28 violations of any kind, 28 effluent exceedances, latest January 31, 2026, largest 883% over the limit.
  • pH: 0 limits, 20 violations of any kind, 20 effluent exceedances, latest April 30, 2026.
  • Chlorine, total residual: 0 limits, 6 violations of any kind, 6 effluent exceedances, latest December 31, 2016, largest 27% over the limit.
  • April 29, 2026: Evaluation (S).
  • April 14, 2026: Agency Enforcement Review (State).
  • March 26, 2026: Agency Enforcement Review (State).
  • February 13, 2026: Agency Enforcement Review (State).

Washington holds 238 Publicly owned treatment works coverages of this permit type in EPA’s file; 113 were issued before WA0023175.

Coverages issued nearest WA0023175

COLTON STP among its neighbors

2 discharge permits are in the Town of Colton-Union Flat Creek subwatershed (HUC 170601080404); WA0023175 is one. Its county: 57, 1 major; WA0023175 is minor permit.

Other permits in the Town of Colton-Union Flat Creek subwatershed (HUC 170601080404)

Nearby on the register

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

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES WA0023175 for COLTON STP in Colton, WA, held by Town of Colton, and lists its administratively continued status, a Minor Discharger class, and a Publicly owned treatment works program. The facts list 7 pollutants on file, 0 under a numeric limit, and 7 with a violation.