Clean Water Act discharge permit · NPDES COG081274

THORNTON WATER PROJECT SEGMENT C (NORTH REACH) - DW, Unincorporated, CO: NPDES COG081274 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
13Pollutants under a numeric limit
2Pollutants with an effluent exceedance

THORNTON WATER PROJECT SEGMENT C (NORTH REACH) - DW, held by S J Louis Construction Inc, holds NPDES permit COG081274, which discharges to Big Thompson River. EPA’s file records it issued July 8, 2025 and expiring May 31, 2028. 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.

Identity

Facility as filed	THORNTON WATER PROJECT SEGMENT C (NORTH REACH) - DW
Permittee as filed	S J Louis Construction Inc
NPDES ID	COG081274
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	July 8, 2025
Expiration date	May 31, 2028
Address	Unincorporated, CO 80550
Receiving water	Big Thompson River
Subwatershed	Seventy Ranch (HUC 101900031001)

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

Effluent limits and exceedances

13Pollutants on file
13Under a numeric limit
2With a violation of any kind
2With 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
Solids, total suspended	22	16	16	May 31, 2026	393% over the limit
Oil and grease	11	1	1	March 31, 2026	1,620% over the limit
pH	22	0	0
Arsenic, total recoverable	22	0	0
Iron, total recoverable	22	0	0
Iron, dissolved [as Fe]	22	0	0
Manganese, dissolved [as Mn]	22	0	0
Selenium, potentially dissolvd	22	0	0
Uranium, total	22	0	0
Flow, in conduit or thru treatment plant	22	0	0
Flow, total	11	0	0
Duration of discharge	11	0	0
Oil and grease visual	11	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 COG081274.

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 COG081274 there.

Nearby on the register

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

This public-records page covers the NPDES COG081274 discharge permit held by S J Louis Construction Inc for THORNTON WATER PROJECT SEGMENT C (NORTH REACH) - DW, a minor discharger whose permit to discharge to Big Thompson River was effective with a status of Effective and runs from July 8, 2025 to May 31, 2028. The page lists 13 pollutants on file, of which 2 are under a numeric limit and 2 have an effluent exceedance.