Clean Water Act discharge permit · NPDES SD0021857

INTERIOR, TOWN OF, Interior, SD: NPDES SD0021857 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
9Pollutants under a numeric limit
0Pollutants with an effluent exceedance

INTERIOR, TOWN OF, held by Interior, Town of, holds NPDES permit SD0021857, which discharges to Unnamed Tributary Of White River. EPA’s file records it issued March 18, 2014 and expiring March 31, 2019. 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	INTERIOR, TOWN OF
Permittee as filed	Interior, Town of
NPDES ID	SD0021857
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	March 18, 2014
Expiration date	March 31, 2019
Issuing agency	SDDENR
Address	Interior, SD 57750
Receiving water	Unnamed Tributary of White River
Subwatershed	Town of Interior-White River (HUC 101402020602)
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

12Pollutants on file
9Under a numeric limit
12With a violation of any kind
0With 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
Nitrogen, ammonia total [as N]	4	132
Temperature, water deg. centigrade	2	132
Flow rate	2	132
BOD, 5-day, 20 deg. C	2	132
pH	2	132
Solids, total suspended	2	132
Chlorine, total residual	0	51
Flow	0	51
Coliform, fecal general	0	50
E. coli, colony forming units [CFU]	2	16
Flow, total	1	15
Duration of discharge	1	15

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES SD0021857.

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 SD0021857.

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 SD0021857 there.

Nearby on the register

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

This public-records page covers NPDES permit SD0021857, held by INTERIOR, TOWN OF in Interior, SD, which discharges to the Unnamed Tributary of White River within the Town of Interior-White River subwatershed (HUC 101402020602). The permit is listed as administratively continued, with a Minor discharger class of 9, zero pollutants under a numeric limit, and zero pollutants with an effluent exceedance.