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Clean Water Act discharge permit · NPDES COR900252

CASTLE ROCK READY MIX, Castle Rock, CO: NPDES COR900252 discharge permit, effluent exceedances, inspections, penalties

CASTLE ROCK READY MIX, held by Smyrna Ready Mix Concrete LLC, holds NPDES permit COR900252, which discharges to Michigan Creek - Tarryall Creek. EPA’s file records it issued May 18, 2012 and expiring June 30, 2017. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for CASTLE ROCK READY MIX: its NPDES ID, its permit type and status, its dates, its address in Castle Rock, Colorado, its receiving water, and 3 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR900252.

Identity

Facility as filedCASTLE ROCK READY MIX
Permittee as filedSmyrna Ready Mix Concrete LLC
NPDES IDCOR900252
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramIndustrial stormwater
IssuedMay 18, 2012
Expiration dateJune 30, 2017
AddressCastle Rock, CO 80104
Receiving waterMichigan Creek - Tarryall Creek
SubwatershedMiddle East Plum Creek (HUC 101900020503)

Cited to the EPA ICIS-NPDES permit file (ECHO 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 suspended100
Iron, total [as Fe]100
Selenium, potentially dissolvd100

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COR900252.

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 COR900252.

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 COR900252 there.

Nearby on the register

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

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES COR900252 for CASTLE ROCK READY MIX in Castle Rock, Colorado, held by Smyrna Ready Mix Concrete LLC, with a status of administratively continued and a Minor Discharger class 3. The register lists 3 pollutants under a numeric limit and 0 pollutants with an effluent exceedance.