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Clean Water Act discharge permit · NPDES SD0022128

SIOUX FALLS, CITY OF, Sioux Falls, SD: NPDES SD0022128 discharge permit, effluent exceedances, inspections, penalties

SIOUX FALLS, CITY OF, held by Sioux Falls, City of, holds NPDES permit SD0022128, which discharges to Big Sioux River. EPA’s file records it issued June 26, 2000 and expiring June 30, 2005. 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 filedSIOUX FALLS, CITY OF
Permittee as filedSioux Falls, City of
NPDES IDSD0022128
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJune 26, 2000
Expiration dateJune 30, 2005
Issuing agencySDDENR
AddressSioux Falls, SD 57104
Receiving waterBIG SIOUX RIVER
SubwatershedCactus Hills-Big Sioux River (HUC 101702031705)
Other EPA IDs (FRS)RCRA handler SDD982596009; ICIS-AIR source SD0000004609900012

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Coliform, fecal general266June 30, 2016618% over the limit
Chlorine, total residual166July 31, 20232,111% over the limit
E. coli, colony forming units [CFU]033June 30, 2025161% over the limit
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia442November 30, 200584% over the limit
IC25 Static Renewal 7 Day Chronic Chrpimephales441March 31, 200175% over the limit
pH211August 31, 2016
BOD, 5-day, 20 deg. C900
Nitrogen, ammonia total [as N]800
Oxygen, dissolved [DO]400
Solids, total suspended300
Temperature, water deg. centigrade200
Flow rate200
Nitrogen, nitrate total [as N]200
Oil & Grease100
BOD, carbonaceous [5 day, 20 C]100
BOD, 5-day, percent removal100
Solids, suspended percent removal100
Oil and grease visual100

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

DateWhat EPA recordedAgency
August 11, 2026Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentST6
July 1, 2026Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
May 30, 2026Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
August 12, 2025Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
June 25, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentST6
February 27, 2025Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentST6
December 31, 2024PR: Failure to submit required report within 30 days of applicable due date (Level I)ST6
October 20, 2024PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]ST6
October 14, 2024Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
August 30, 2024Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
August 28, 2024Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentST6
August 25, 2024Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
July 31, 2024Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentST6
June 22, 2024Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
June 22, 2024Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
April 4, 2024Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentST6
March 26, 2024Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentST6
February 28, 2024Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
July 26, 2023Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
July 17, 2023Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
July 5, 2023Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangermentST6

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 SD0022128 there.

Nearby on the register

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

What this page shows

This public-records page covers NPDES permit SD0022128, held by Sioux Falls, City of, a Major Discharger publicly owned treatment works that discharges to the Big Sioux River, with its status shown as administratively continued. The page lists 17 Major Discharger class designations, 6 pollutants under a numeric limit, and 6 pollutants with an effluent exceedance.