Clean Water Act discharge permit · NPDES SD0023396

YANKTON, CITY OF, Yankton, SD: NPDES SD0023396 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
36Pollutants under a numeric limit
7Pollutants with an effluent exceedance

YANKTON, CITY OF, held by Yankton, City of, holds NPDES permit SD0023396, which discharges to Missouri River. EPA’s file records it issued September 25, 2015 and expiring September 30, 2020. 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	YANKTON, CITY OF
Permittee as filed	Yankton, City of
NPDES ID	SD0023396
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	September 25, 2015
Expiration date	September 30, 2020
Issuing agency	SDDENR
Address	Yankton, SD 57078
Receiving water	MISSOURI RIVER
Subwatershed	Lake Yankton-Missouri River (HUC 101701011204)
Program components on file	POTW, Pretreatment
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems
Other EPA IDs (FRS)	RCRA handler SDR000202598

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

38Pollutants on file
36Under a numeric limit
7With 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.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Coliform, total general	2	15	15	January 31, 2026	24,033% over the limit
Coliform, fecal general	0	15	15	July 31, 2013	99,999% over the limit
BOD, 5-day, 20 deg. C	3	10	8	January 31, 2011	51% over the limit
Solids, total suspended	3	10	8	February 28, 2021	113% over the limit
E. coli, colony forming units [CFU]	2	3	3	August 31, 2021	116% over the limit
Toxicity [acute], Pimephales promelas [Fathead Minnow]	1	2	2	September 30, 2026 (as filed; later than the file's load date)	182% over the limit
Chlorine, total residual	0	1	1	July 31, 2001	468% over the limit
Report due [yrmoda]	6	0	0
Temperature, water deg. centigrade	2	0	0
Flow rate	2	0	0
Oxygen, dissolved [DO]	2	0	0
pH	2	0	0
Nitrogen, ammonia total [as N]	2	0	0
Cyanide, weak acid, dissociable	2	0	0
Cyanide, total [as CN]	2	0	0
Hardness, total [as CaCO3]	2	0	0
Arsenic, total recoverable	2	0	0
Selenium, total recoverable	2	0	0
Thallium, total recoverable	2	0	0
Beryllium, total recoverable [as Be]	2	0	0
Nickel, total recoverable	2	0	0
Silver total recoverable	2	0	0
Zinc, total recoverable	2	0	0
Cadmium, total recoverable	2	0	0
Lead, total recoverable	2	0	0
Chromium, total recoverable	2	0	0
Copper, total recoverable	2	0	0
Molybdenum, total recoverable	2	0	0
Antimony, total recoverable	2	0	0
Phenols	2	0	0
Mercury, total recoverable	2	0	0
Oil and grease, hexane extr method	1	0	0
Nitrogen, total [as N]	1	0	0
Phosphorus, total [as P]	1	0	0
Toxicity [acute], Ceriodaphnia dubia	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

5Single-event violations

Date	What EPA recorded	Agency
April 29, 2026	PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]	ST6
April 23, 2026	Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment	ST6
February 4, 2026	PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]	ST6
January 29, 2026	Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment	ST6
September 11, 2025	Failure to submit report to the permitting authority of any anticipated bypass [122.41(m)(3)(i)]	ST6

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 Clean Water Act discharge permit NPDES SD0023396, held by Yankton, City of, which discharges to the Missouri River and is listed as administratively continued after its September 30, 2020 expiration. The page lists a Major Discharger class, 7 pollutants under a numeric limit, and 36 pollutants with an effluent exceedance.