Clean Water Act discharge permit · NPDES SD0000264

NORTHERN STATES POWER - ANGUS ANSON GENERATING PLANT, Sioux Falls, SD: NPDES SD0000264 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
16Pollutants under a numeric limit
0Pollutants with an effluent exceedance

NORTHERN STATES POWER - ANGUS ANSON GENERATING PLANT, held by NORTHERN STATES POWER-PATHFIND, holds NPDES permit SD0000264, which discharges to Big Sioux River. EPA’s file records it issued July 13, 2004 and expiring July 13, 2009. 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	NORTHERN STATES POWER - ANGUS ANSON GENERATING PLANT
Permittee as filed	NORTHERN STATES POWER-PATHFIND
NPDES ID	SD0000264
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	July 13, 2004
Expiration date	July 13, 2009
Issuing agency	SDDENR
Address	Sioux Falls, SD 57110
Receiving water	BIG SIOUX RIVER
Subwatershed	Cactus Hills-Big Sioux River (HUC 101702031705)
NAICS	221111 – Hydroelectric Power Generation
SIC	4911 – Electric Services
Other EPA IDs (FRS)	RCRA handler SDD000817932; ICIS-AIR source SD0000004609900002

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

16Pollutants on file
16Under a numeric limit
2With 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
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia	1	1
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas	1	1
Flow rate	4	0
Temperature, water deg. fahrenheit	2	0
BOD, 5-day, 20 deg. C	2	0
pH	2	0
Nitrogen, nitrate total [as N]	2	0
Solids, total dissolved	2	0
Conductivity	1	0
Alkalinity, total [as CaCO3]	1	0
Solids, total suspended	1	0
Floating solids, waste or visible foam-visual	1	0
Sanitary waste discharged-assessmnt	1	0
Chlorine, total residual	1	0
Duration of discharge	1	0
Hydrocarbons, petroleum	1	0

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES SD0000264.

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 SD0000264.

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 SD0000264 there.

Nearby on the register

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

This public-records page covers Clean Water Act NPDES permit SD0000264 for the NORTHERN STATES POWER - ANGUS ANSON GENERATING PLANT in Sioux Falls, SD, which discharges to the Big Sioux River, and lists its status as administratively continued with a Minor Discharger class of 16. The page reports 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance, and states that the permit was issued July 13, 2004 and expires July 13, 2009.