Clean Water Act discharge permit · NPDES COG591073

ARAPAHOE PARK RACETRACK WWTF, Aurora, CO: NPDES COG591073 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
80Pollutants under a numeric limit
2Pollutants with an effluent exceedance

ARAPAHOE PARK RACETRACK WWTF, held by Racing Associates of CO Ltd dba Ballys Arapahoe Park, holds NPDES permit COG591073, which discharges to Unnamed Tributary To Murphy Crk To Sand Crk. EPA’s file records it issued October 30, 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	ARAPAHOE PARK RACETRACK WWTF
Permittee as filed	Racing Associates of CO Ltd dba Ballys Arapahoe Park
NPDES ID	COG591073
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	October 30, 2024
Expiration date	December 31, 2029
Address	Aurora, CO 80016
Receiving water	Unnamed tributary to Murphy Crk to Sand Crk
Subwatershed	Coal Creek (HUC 101900030202)

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

Effluent limits and exceedances

80Pollutants on file
80Under 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; the 60 with the most exceedances of 80 are shown.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Flow, in conduit or thru treatment plant	4	6	6	July 31, 2026	526% over the limit
BOD, 5-day, percent removal	1	2	2	July 31, 2026	9% over the limit
Nitrogen, ammonia total [as N]	24	0	0
BOD, 5-day, 20 deg. C	6	0	0
Solids, total suspended	4	0	0
Solids, total dissolved	4	0	0
Sulfide-hydrogen sulfide [undissociated]	3	0	0
Plant capacity fact. percent of capacity	2	0	0
pH	2	0	0
Nitrogen, inorganic total	2	0	0
Manganese, dissolved [as Mn]	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
Chromium, trivalent, potentially dissolvd	2	0	0
Lead, potentially dissolvd	2	0	0
Manganese, potentially dissolvd	2	0	0
Nickel, potentially dissolvd	2	0	0
Selenium, potentially dissolvd	2	0	0
Uranium, potentially dissolvd	2	0	0
Chlorine, total residual	2	0	0
E. coli	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

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 COG591073.

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.

This public-records page covers NPDES permit COG591073 for the Arapahoe Park Racetrack WWTF in Aurora, CO, held by Racing Associates of CO Ltd dba Ballys Arapahoe Park, with a status of Effective and a Minor discharger class. The page lists 80 pollutants on file, 80 under a numeric limit, and 2 pollutants with an effluent exceedance.