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Clean Water Act discharge permit · NPDES WA0022683

CASTLE ROCK STP, Castle Rock, WA: NPDES WA0022683 discharge permit, effluent exceedances, inspections, penalties

CASTLE ROCK STP, held by City of Castle Rock, holds NPDES permit WA0022683. EPA’s file records it issued July 17, 2014 and expiring July 31, 2019.

CASTLE ROCK STP, Castle Rock, Washington: Individual permit WA0022683, held by City of Castle Rock; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued July 17, 2014, term to July 31, 2019, by State.

  • Coliform, fecal general: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest May 31, 2021, largest 39% over the limit.
  • pH, minimum: 0 limits, 2 violations of any kind, 2 effluent exceedances, latest April 30, 2008.
  • Solids, total suspended: 8 limits, 121 violations of any kind, 1 effluent exceedance, latest May 31, 2021, largest 9% over the limit.
  • BOD, 5-day, 20 deg. C: 8 limits, 120 violations of any kind, 0 effluent exceedances.
  • pH: 1 limit, 38 violations of any kind, 0 effluent exceedances.
  • Nitrogen, ammonia total [as N]: 1 limit, 3 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
  • Oil and grease, hexane extr method: 1 limit, 2 violations of any kind, 0 effluent exceedances.
  • Nitrogen, Kjeldahl, total [as N]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
  • Nitrite + Nitrate total [as N]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 1 limit, 2 violations of any kind, 0 effluent exceedances.
  • Solids, total dissolved: 1 limit, 2 violations of any kind, 0 effluent exceedances.
  • Flow: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Temperature, water deg. centigrade: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • October 5, 2026: Evaluation (S).
  • September 8, 2026: Evaluation (S).
  • May 28, 2026: Evaluation (S).
  • February 11, 2026: Evaluation (S).
  • February 3, 2026: Agency Enforcement Review (State).

Washington holds 238 Publicly owned treatment works coverages of this permit type in EPA’s file; 90 were issued before WA0022683.

Coverages issued nearest WA0022683

CASTLE ROCK STP among its neighbors

EPA’s permit file holds 13 discharge permits in the Cowlitz River-Lecker Creek subwatershed (HUC 170800050906), WA0022683 among them. Its county holds 174, 5 of them major permits; WA0022683 is a minor permit.

Other permits in the Cowlitz River-Lecker Creek subwatershed (HUC 170800050906)

Identity

Facility as filedCASTLE ROCK STP
Permittee as filedCity of Castle Rock
NPDES IDWA0022683
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
IssuedJuly 17, 2014
Expiration dateJuly 31, 2019
Issuing agencyState
AddressCastle Rock, WA 98611
SubwatershedCowlitz River-Lecker Creek (HUC 170800050906)
Program components on filePOTW, Pretreatment

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
Coliform, fecal general222May 31, 202139% over the limit
pH, minimum022April 30, 2008
Solids, total suspended81211May 31, 20219% over the limit
BOD, 5-day, 20 deg. C81200
pH1380
Nitrogen, ammonia total [as N]130
Oxygen, dissolved [DO]120
Oil and grease, hexane extr method120
Nitrogen, Kjeldahl, total [as N]120
Nitrite + Nitrate total [as N]120
Phosphorus, total [as P]120
Solids, total dissolved120
Flow400
Temperature, water deg. centigrade200

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES WA0022683.

Inspections

DateWhat EPA recordedAgency
October 5, 2026EvaluationS
September 8, 2026EvaluationS
May 28, 2026EvaluationS
February 11, 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
February 3, 2026Agency Enforcement ReviewState

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Nearby on the register

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

What this page shows

This public-records page covers NPDES permit WA0022683 for CASTLE ROCK STP in Castle Rock, WA, held by City of Castle Rock and listed as administratively continued. The facts list 13 pollutants under a numeric limit, 3 pollutants with an effluent exceedance, and 14 pollutants on file, with the permit issued July 17, 2014 and expiring July 31, 2019.