Clean Water Act discharge permit · NPDES COG591156

LYONS TOWN OF, Lyons, CO: NPDES COG591156 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
60Pollutants under a numeric limit
4Pollutants with an effluent exceedance

LYONS TOWN OF, held by Lyons Town of, holds NPDES permit COG591156, which discharges to St Vrain River. EPA’s file records it issued November 10, 2022 and expiring May 31, 2027. 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	LYONS TOWN OF
Permittee as filed	Lyons Town of
NPDES ID	COG591156
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	November 10, 2022
Expiration date	May 31, 2027
Address	Lyons, CO 80540
Receiving water	St Vrain River
Subwatershed	Indian Mountain-Saint Vrain Creek (HUC 101900050701)

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

Effluent limits and exceedances

60Pollutants on file
60Under a numeric limit
6With a violation of any kind
4With 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
Nitrogen, ammonia total [as N]	24	5	5	August 31, 2025	856% over the limit
E. coli	2	2	2	July 31, 2025	516% over the limit
Nitrogen, inorganic total	1	2	2	August 31, 2025	211% over the limit
BOD, 5-day, 20 deg. C	6	1	1	October 31, 2024	20% over the limit
Temperature, water deg. centigrade	8	18	0
Acrylamide	1	1	0
Solids, total suspended	4	0	0
Flow, in conduit or thru treatment plant	4	0	0
Static Renewal 7 Day Chronic Ceriodaphnia dubia	3	0	0
Static Renewal 7 Day Chronic Pimephales promelas	3	0	0
Plant capacity fact. percent of capacity	2	0	0
pH	2	0	0
Chlorine, total residual	2	0	0
Perfluorooctanoic acid (PFOA)	2	0	0
Perfluorobutanoic acid (PFBA)	2	0	0
Perfluorooctanesulfonamide (PFOSA)	2	0	0
Perfluoropentanoic acid (PFPeA)	2	0	0
Perfluorohexanoic acid (PFHxA)	2	0	0
Perfluoroheptanoic acid (PFHpA)	2	0	0
Perfluorononanoic acid (PFNA)	2	0	0
Perfluorodecanoic acid (PFDA)	2	0	0
Perfluoroundecanoic acid (PFUnA)	2	0	0
Perfluorododecanoic acid (PFDoA)	2	0	0
Perfluorotridecanoic acid (PFTrDA)	2	0	0
Perfluorotetradecanoic acid (PFTeDA)	2	0	0
N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)	2	0	0
N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)	2	0	0
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)	2	0	0
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)	2	0	0
Perfluorobutanesulfonic acid (PFBS)	2	0	0
Perfluorodecanesulfonic acid (PFDS)	2	0	0
Perfluoroheptanesulfonic acid (PFHpS)	2	0	0
Perfluorohexanesulfonic acid (PFHxS)	2	0	0
Perfluorooctanesulfonic acid (PFOS)	2	0	0
1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)	2	0	0
1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)	2	0	0
1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)	2	0	0
Perfluoropentanesulfonic acid (PFPeS)	2	0	0
Perfluorononanesulfonic acid (PFNS)	2	0	0
Hexafluoropropylene oxide dimer acid (HFPO-DA)	2	0	0
Perfluoro-2-methoxypropanoic acid	2	0	0
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)	2	0	0
Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)	2	0	0
Perfluorododecanesulfonic acid (PFDoS)	2	0	0
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)	2	0	0
Potassium 9-chlorohexadecafluoro-3-oxanonane-1-sulfonate	2	0	0
Potassium 11-chloroeicosafluoro-3-oxaundecane-1-sulfonate	2	0	0
N-methyl perfluorooctanesulfonamide (NMeFOSA)	2	0	0
N-ethyl perfluorooctanesulfonamide (NEtFOSA)	2	0	0
PFAS Sum	2	0	0
3-Perfluoropropyl propanoic acid (3:3 FTCA)	2	0	0
3-Perfluoroheptyl propanoic acid (7:3 FTCA)	2	0	0
Perfluoro-4-methoxybutanoic acid (PFMBA)	2	0	0
2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA)	2	0	0
Nitrogen, nitrite total [as N]	1	0	0
Arsenic, total recoverable	1	0	0
Oil and grease	1	0	0
BOD, 5-day, percent removal	1	0	0
Solids, suspended percent removal	1	0	0
Oil and grease visual	1	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 COG591156.

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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Nearby on the register

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