Clean Water Act discharge permit · NPDES COG591039

CHEYENNE WELLS SANITATION DIST, Cheyenne Wells, CO: NPDES COG591039 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
91Pollutants under a numeric limit
6Pollutants with an effluent exceedance

CHEYENNE WELLS SANITATION DIST, held by Cheyenne Wells Sanitation District, holds NPDES permit COG591039, which discharges to Willow Creek. EPA’s file records it issued October 3, 2024 and expiring December 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.

Identity

Facility as filed	CHEYENNE WELLS SANITATION DIST
Permittee as filed	Cheyenne Wells Sanitation District
NPDES ID	COG591039
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	October 3, 2024
Expiration date	December 31, 2029
Address	Cheyenne Wells, CO 80810
Receiving water	WIllow Creek
Subwatershed	Outlet Willow Creek (HUC 102600010103)

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

Effluent limits and exceedances

91Pollutants on file
91Under a numeric limit
81With a violation of any kind
6With 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; the 60 with the most exceedances of 91 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Nitrogen, ammonia total [as N]	48	7	7	April 30, 2026	57% over the limit
TU Static Renewal 7-Day Chronic Pimphales promelas	3	4	2	June 30, 2026	100% over the limit
Sulfide-hydrogen sulfide [undissociated]	1	3	2	June 30, 2026	39,900% over the limit
BOD, 5-day, percent removal	1	2	2	August 31, 2025	47% over the limit
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	3	3	1	March 31, 2026	100% over the limit
E. coli	4	1	1	April 30, 2026	30% over the limit
Chromium, hexavalent dissolved [as Cr]	2	2	0
Zinc, potentially dissolved	2	2	0
Silver, potentially dissolved	2	2	0
Copper, potentially dissolved	2	2	0
Cadmium, potentially dissolvd	2	2	0
Chromium, trivalent, potentially dissolvd	2	2	0
Lead, potentially dissolvd	2	2	0
Manganese, potentially dissolvd	2	2	0
Nickel, potentially dissolvd	2	2	0
Selenium, potentially dissolvd	2	2	0
Uranium, potentially dissolvd	2	2	0
Perfluorooctanoic acid (PFOA)	2	2	0
Perfluorobutanoic acid (PFBA)	2	2	0
Perfluorooctanesulfonamide (PFOSA)	2	2	0
Perfluoropentanoic acid (PFPeA)	2	2	0
Perfluorohexanoic acid (PFHxA)	2	2	0
Perfluoroheptanoic acid (PFHpA)	2	2	0
Perfluorononanoic acid (PFNA)	2	2	0
Perfluorodecanoic acid (PFDA)	2	2	0
Perfluoroundecanoic acid (PFUnA)	2	2	0
Perfluorododecanoic acid (PFDoA)	2	2	0
Perfluorotridecanoic acid (PFTrDA)	2	2	0
Perfluorotetradecanoic acid (PFTeDA)	2	2	0
N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)	2	2	0
N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)	2	2	0
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)	2	2	0
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)	2	2	0
Perfluorobutanesulfonic acid (PFBS)	2	2	0
Perfluorodecanesulfonic acid (PFDS)	2	2	0
Perfluoroheptanesulfonic acid (PFHpS)	2	2	0
Perfluorohexanesulfonic acid (PFHxS)	2	2	0
Perfluorooctanesulfonic acid (PFOS)	2	2	0
1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)	2	2	0
1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)	2	2	0
1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)	2	2	0
Perfluoropentanesulfonic acid (PFPeS)	2	2	0
Perfluorononanesulfonic acid (PFNS)	2	2	0
Hexafluoropropylene oxide dimer acid (HFPO-DA)	2	2	0
Perfluoro-2-methoxypropanoic acid	2	2	0
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)	2	2	0
Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)	2	2	0
Perfluorododecanesulfonic acid (PFDoS)	2	2	0
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)	2	2	0
Potassium 9-chlorohexadecafluoro-3-oxanonane-1-sulfonate	2	2	0
Potassium 11-chloroeicosafluoro-3-oxaundecane-1-sulfonate	2	2	0
N-methyl perfluorooctanesulfonamide (NMeFOSA)	2	2	0
N-ethyl perfluorooctanesulfonamide (NEtFOSA)	2	2	0
Mercury, total [as Hg]	2	2	0
PFAS Sum	2	2	0
3-Perfluoropropyl propanoic acid (3:3 FTCA)	2	2	0
3-Perfluoroheptyl propanoic acid (7:3 FTCA)	2	2	0
Perfluoro-4-methoxybutanoic acid (PFMBA)	2	2	0
2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA)	2	2	0
Cyanide, total [as CN]	1	1	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 COG591039.

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 COG591039 there.

Nearby on the register

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

This public-records page covers the NPDES discharge permit COG591039, held by Cheyenne Wells Sanitation District and discharging to Willow Creek, with the permit effective and classed as a minor discharger. The page lists 91 pollutants on file, 91 of them under a numeric limit, 81 with a violation of any kind, and 6 with an effluent exceedance.