Clean Water Act discharge permit · NPDES WA0022683

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

Administratively continuedPermit status
MinorDischarger class
13Pollutants under a numeric limit
3Pollutants with an effluent exceedance

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. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	CASTLE ROCK STP
Permittee as filed	City of Castle Rock
NPDES ID	WA0022683
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	July 17, 2014
Expiration date	July 31, 2019
Issuing agency	State
Address	Castle Rock, WA 98611
Subwatershed	Cowlitz River-Lecker Creek (HUC 170800050906)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

14Pollutants on file
13Under a numeric limit
12With a violation of any kind
3With an effluent exceedance

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 measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Coliform, fecal general	2	2	2	May 31, 2021	39% over the limit
pH, minimum	0	2	2	April 30, 2008
Solids, total suspended	8	121	1	May 31, 2021	9% over the limit
BOD, 5-day, 20 deg. C	8	120	0
pH	1	38	0
Nitrogen, ammonia total [as N]	1	3	0
Oxygen, dissolved [DO]	1	2	0
Oil and grease, hexane extr method	1	2	0
Nitrogen, Kjeldahl, total [as N]	1	2	0
Nitrite + Nitrate total [as N]	1	2	0
Phosphorus, total [as P]	1	2	0
Solids, total dissolved	1	2	0
Flow	4	0	0
Temperature, water deg. centigrade	2	0	0

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

0Single-event violations

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

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

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 WA0022683 there.

Nearby on the register

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