Clean Water Act discharge permit · NPDES SD0020567

NORTH SIOUX CITY, CITY OF, North Sioux City, SD: NPDES SD0020567 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
10Pollutants under a numeric limit
5Pollutants with an effluent exceedance

NORTH SIOUX CITY, CITY OF, held by North Sioux City, City of, holds NPDES permit SD0020567, which discharges to Mud Lake. EPA’s file records it issued November 1, 2019 and expiring September 30, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	NORTH SIOUX CITY, CITY OF
Permittee as filed	North Sioux City, City of
NPDES ID	SD0020567
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	November 1, 2019
Expiration date	September 30, 2024
Issuing agency	SDDANR
Address	North Sioux City, SD 57049
Receiving water	MUD LAKE
Receiving water impaired	303(D) Listed
Subwatershed	Walnut Creek-Missouri River (HUC 101701011504)

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

Effluent limits and exceedances

12Pollutants on file
10Under a numeric limit
12With a violation of any kind
5With 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
Solids, total suspended	2	130	34	April 30, 2020	120% over the limit
Coliform, fecal general	0	61	22	August 31, 2013	750% over the limit
BOD, 5-day, 20 deg. C	2	127	11	November 30, 2023	160% over the limit
E. coli, colony forming units [CFU]	2	12	10	July 31, 2025	791% over the limit
pH	2	119	3	April 30, 2025
Flow rate	2	120	0
Chlorine, total residual	2	60	0
Temperature, water deg. centigrade	2	24	0
Flow, total	1	3	0
Nitrogen, total [as N]	1	2	0
Phosphorus, total [as P]	1	2	0
Duration of discharge	0	2	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

2Single-event violations

Date	What EPA recorded	Agency
June 29, 2024	PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)]	ST6
June 23, 2024	Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment	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.

Watch this permit

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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 SD0020567 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.