Clean Water Act discharge permit · NPDES COG591031

SIMLA WWTF, Simla, CO: NPDES COG591031 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
95Pollutants under a numeric limit
7Pollutants with an effluent exceedance

SIMLA WWTF, held by Simla Town of, holds NPDES permit COG591031, which discharges to Unnamed Ditch And Big Sandy Creek. EPA’s file records it issued September 19, 2024 and expiring December 31, 2029. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	SIMLA WWTF
Permittee as filed	Simla Town of
NPDES ID	COG591031
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	September 19, 2024
Expiration date	December 31, 2029
Address	Simla, CO 80835
Receiving water	Unnamed ditch and Big Sandy Creek
Subwatershed	Antelope Creek-Big Sandy Creek (HUC 110200110103)
SIC	4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

95Pollutants on file
95Under a numeric limit
14With a violation of any kind
7With 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 95 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
BOD, 5-day, 20 deg. C	6	7	7	July 31, 2026	70% over the limit
BOD, 5-day, percent removal	1	4	4	July 31, 2026	27% over the limit
Sulfate	1	4	3	February 28, 2025	10% over the limit
Nitrogen, ammonia total [as N]	48	4	2	December 31, 2025	5% over the limit
E. coli	2	2	2	December 31, 2024	284% over the limit
Chloride [as Cl]	1	2	1	December 31, 2024	1% over the limit
Solids, total suspended	2	1	1	February 28, 2026	12% over the limit
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia	3	2	0
TU Static Renewal 7-Day Chronic Pimphales promelas	3	2	0
Selenium, potentially dissolvd	2	2	0
Nitrogen, inorganic total	2	1	0
Nitrogen, nitrite total [as N]	1	1	0
Manganese, dissolved [as Mn]	1	1	0
Sulfide-hydrogen sulfide [undissociated]	1	1	0
Flow, in conduit or thru treatment plant	4	0	0
Chlorine, total residual	4	0	0
Plant capacity fact. percent of capacity	2	0	0
pH	2	0	0
Chromium, hexavalent dissolved [as Cr]	2	0	0
Zinc, potentially dissolved	2	0	0
Silver, potentially dissolved	2	0	0
Copper, potentially dissolved	2	0	0
Cadmium, potentially dissolvd	2	0	0
Lead, potentially dissolvd	2	0	0
Manganese, potentially dissolvd	2	0	0
Nickel, potentially dissolvd	2	0	0
Uranium, potentially dissolvd	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

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 COG591031.

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 October 14, 2026.

This public-records page covers NPDES permit COG591031 for the SIMLA WWTF in Simla, CO, held by Simla Town of and discharging to an unnamed ditch and Big Sandy Creek. The facts list 95 pollutants on file, 95 under a numeric limit, 14 with a violation of any kind, and 7 with an effluent exceedance.