Clean Water Act discharge permit · NPDES COG604465

JOHNSTOWN WATER TREATMENT PLANT, Johnstown, CO: NPDES COG604465 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
8Pollutants under a numeric limit
0Pollutants with an effluent exceedance

JOHNSTOWN WATER TREATMENT PLANT, held by MWH Constructors, holds NPDES permit COG604465, which discharges to Unnamed Tributary To Big Thompson River. EPA’s file records it issued October 9, 2024 and expiring December 31, 2026. 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	JOHNSTOWN WATER TREATMENT PLANT
Permittee as filed	MWH Constructors
NPDES ID	COG604465
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	October 9, 2024
Expiration date	December 31, 2026
Address	Johnstown, CO 80534
Receiving water	Unnamed tributary to BIg Thompson River
Subwatershed	101900060606 (HUC 101900060606)

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

Effluent limits and exceedances

8Pollutants on file
8Under a numeric limit
8With a violation of any kind
0With 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
pH	2	4
Solids, total suspended	2	4
Chlorine, total residual	2	4
Oil and grease	1	2
Flow, in conduit or thru treatment plant	1	2
Flow, total	1	2
Duration of discharge	1	2
Oil and grease visual	1	2

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COG604465.

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 COG604465.

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 COG604465 there.

Nearby on the register

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

This public-records page covers NPDES permit COG604465 for the JOHNSTOWN WATER TREATMENT PLANT in Johnstown, CO, held by MWH Constructors and discharging to an Unnamed Tributary To Big Thompson River in subwatershed 101900060606. The permit is listed as Effective and as a Minor Discharger class, with issue and expiration dates as recorded in the EPA permit file. The page lists 8 pollutants on file, 8 under a numeric limit, 8 with a violation of any kind, and 0 with an effluent exceedance.