Clean Water Act discharge permit · NPDES SD0022730

AVON, CITY OF, Avon, SD: NPDES SD0022730 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
10Pollutants under a numeric limit
6Pollutants with an effluent exceedance

AVON, CITY OF, held by Avon, City of, holds NPDES permit SD0022730, which discharges to Tributary Of Dry Choteau Creek. EPA’s file records it issued December 17, 2010 and expiring December 31, 2015. 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	AVON, CITY OF
Permittee as filed	Avon, City of
NPDES ID	SD0022730
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	December 17, 2010
Expiration date	December 31, 2015
Issuing agency	SDDENR
Address	Avon, SD 57315
Receiving water	TRIBUTARY OF DRY CHOTEAU CREEK
Subwatershed	Lower Dry Choteau Creek (HUC 101701010303)

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

Effluent limits and exceedances

14Pollutants on file
10Under a numeric limit
14With 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.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Nitrogen, ammonia total [as N]	4	134	23	April 30, 2023	283% over the limit
Solids, total suspended	2	123	14	September 30, 2021	121% over the limit
pH	2	125	10	April 30, 2022
BOD, 5-day, 20 deg. C	2	117	4	October 31, 2019	87% over the limit
E. coli, colony forming units [CFU]	4	40	2	September 30, 2019	69% over the limit
Coliform, fecal general	2	18	2	May 31, 2007	15% over the limit
Temperature, water deg. centigrade	2	116	0
Flow rate	2	114	0
Flow, total	1	33	0
Duration of discharge	1	33	0
Chlorine, total residual	0	22	0
Nitrogen, total [as N]	0	13	0
Phosphorus, total [as P]	0	13	0
Flow	0	4	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 SD0022730.

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 SD0022730 there.

Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES SD0022730, held by Avon, City of, for a publicly owned treatment works in Avon, SD that discharges to Tributary Of Dry Choteau Creek in the Lower Dry Choteau Creek subwatershed (HUC 101701010303). The page lists 6 pollutants with an effluent exceedance, 10 pollutants under a numeric limit, and 14 pollutants on file, and shows the permit as administratively continued with a Minor discharger class.