Clean Water Act discharge permit · NPDES COR429303

LOUISVILLE SUBSTATION EXPANSION (SUB), Louisville, CO: NPDES COR429303 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

LOUISVILLE SUBSTATION EXPANSION (SUB), held by Public Service Company of Colorado, holds NPDES permit COR429303. EPA’s file records it issued November 19, 2025 and expiring March 31, 2029. 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 LOUISVILLE SUBSTATION EXPANSION (SUB): its NPDES ID, its permit type and status, its dates, its address in Louisville, Colorado. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR429303.

Identity

Facility as filed	LOUISVILLE SUBSTATION EXPANSION (SUB)
Permittee as filed	Public Service Company of Colorado
NPDES ID	COR429303
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	November 19, 2025
Expiration date	March 31, 2029
Address	Louisville, CO 80027
Subwatershed	Middle Coal Creek (HUC 101900050603)

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

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES COR429303.

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 COR429303.

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.

Watch this permit

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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 COR429303 there.

Nearby on the register

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

The LOUISVILLE SUBSTATION EXPANSION (SUB) general permit coverage, COR429303, ranks among the 249 general permit coverages in Boulder County, with 79.5% of them carrying an earlier issue date than this one. It sits within a Middle Coal Creek subwatershed group of 57 NPDES permits, and Boulder County as a whole holds 251 general permit coverages on EPA's NPDES register, this one included. The permit has no pollutants under a numeric limit and no pollutants with an effluent exceedance, while 25.5% of the county's 251 general permit coverages have a violation on file.