Clean Water Act discharge permit · NPDES ID0021261

IDAHO FALLS, CITY OF - IDAHO FALLS WWTP, Idaho Falls, ID: NPDES ID0021261 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
18Pollutants under a numeric limit
7Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

IDAHO FALLS, CITY OF - IDAHO FALLS WWTP, held by IDAHO FALLS, CITY OF, holds NPDES permit ID0021261, which discharges to Snake River. EPA’s file records it issued April 17, 2001 and expiring May 22, 2006.

IDAHO FALLS, CITY OF - IDAHO FALLS WWTP, Idaho Falls, Idaho: Individual permit ID0021261, held by IDAHO FALLS, CITY OF; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued April 17, 2001, term to May 22, 2006; discharges to SNAKE RIVER.

Nitrogen, ammonia total [as N]: 11 limits, 208 violations of any kind, 204 effluent exceedances, latest January 31, 2024, largest 895% over the limit.
E. coli, MTEC-MF: 2 limits, 9 violations of any kind, 9 effluent exceedances, latest October 31, 2012, largest 294% over the limit.
Phosphorus, total [as P]: 3 limits, 8 violations of any kind, 8 effluent exceedances, latest August 31, 2025, largest 155% over the limit.
E. coli: 0 limits, 8 violations of any kind, 6 effluent exceedances, latest August 31, 2022, largest 99,999% over the limit.
BOD, 5-day, 20 deg. C: 6 limits, 5 violations of any kind, 5 effluent exceedances, latest July 31, 2020, largest 13% over the limit.
Solids, total suspended: 6 limits, 1 violation of any kind, 1 effluent exceedance, latest June 30, 2011, largest 136% over the limit.
BOD, 5-day, percent removal: 1 limit, 1 violation of any kind, 1 effluent exceedance, latest September 30, 2018, largest 13% over the limit.
Temperature, water deg. centigrade: 3 limits, 20 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Chromium, hexavalent dissolved [as Cr]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
Phosphate, ortho [as P]: 0 limits, 2 violations of any kind, 0 effluent exceedances.
pH: 4 limits, 0 violations of any kind, 0 effluent exceedances.
Oxygen, dissolved [DO]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrogen, nitrite total [as N]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrogen, nitrate total [as N]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrogen, Kjeldahl, total [as N]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Hardness, total [as CaCO3]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 2 limits, 0 violations of any kind, 0 effluent exceedances.
Coliform, fecal MF, MFC broth, 44.5 C: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Flow: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Solids, suspended percent removal: 1 limit, 0 violations of any kind, 0 effluent exceedances.

Idaho holds 110 Publicly owned treatment works coverages of this permit type in EPA’s file; 16 were issued before ID0021261.

Coverages issued nearest ID0021261

September 30, 1999: MIDDLETON, CITY OF - MIDDLETON WWTP, Middleton, ID0021831, held by MIDDLETON, CITY OF
March 27, 2000: GOODING, CITY OF - GOODING WWTP, Gooding, ID0020028, held by GOODING, CITY OF
March 28, 2000: BURLEY INDUSTRIAL WWTP, Burley, ID0000663, held by BURLEY, CITY OF
March 28, 2000: TWIN FALLS, CITY OF - TWIN FALLS WWTP, Twin Falls, ID0021270, held by TWIN FALLS, CITY OF
October 26, 2000: BLACKFOOT, CITY OF - BLACKFOOT WWTP, Blackfoot, ID0020044, held by BLACKFOOT, CITY OF
May 9, 2001: KETCHUM, CITY OF - KETCHUM/SUN VALLEY WWTP, Ketchum, ID0020281, held by CITY OF KETCHUM
May 9, 2001: HAILEY, CITY OF - WOODSIDE WWTF, Hailey, ID0020303, held by HAILEY, CITY OF
June 22, 2001: WEISER, CITY OF - WEISER WWTP, Weiser, ID0020290, held by WEISER, CITY OF
August 9, 2001: DRIGGS, CITY OF - DRIGGS WWTP, Driggs, ID0020141, held by DRIGGS, CITY OF
August 9, 2001: ST ANTHONY, CITY OF - ST ANTHONY WWTP, Saint Anthony, ID0020401, held by ST. ANTHONY, CITY OF

IDAHO FALLS, CITY OF - IDAHO FALLS WWTP among its neighbors

EPA’s permit file holds 65 discharge permits in the Town of Shelley-Snake River subwatershed (HUC 170402060301), ID0021261 among them. Its county holds 73, 1 of them major permits; ID0021261 is a major permit.

Other permits in the Town of Shelley-Snake River subwatershed (HUC 170402060301)

17TH STREET & ST CLAIR RD INTERSECTION IMPROVEMENTS, Idaho Falls: IDR1000LD, not classed
209 PIT AND HMA PLANT, Idaho Falls: IDR05J10H, minor permit, discharging to Snake River, permit term to February 28, 2026
23696 MEPPEN CANAL TRAIL, Idaho Falls: IDR10L0BH, not classed
23696 MEPPEN CANAL TRAIL - CONTRACTOR, Idaho Falls: IDR10L0BC, not classed
6130 S 35TH W DEMOLITION PROJECT, Idaho Falls: IDR1001Q4, not classed
7TH STREET WATER LINE REPLACEMENT, Idaho Falls: IDR1000KT, not classed
AFCU AMMON, Ammon: IDR10C1XQ, minor permit, discharging to Little Sand Creek, permit term to February 9, 2027
AFFINITY AT IDAHO FALLS, Idaho Falls: IDR10C1YR, minor permit, discharging to Snake River, permit term to February 9, 2027
AFFINITY AT IDAHO FALLS (KNIFE RIVER), Idaho Falls: IDR10C1ZM, minor permit, discharging to Snake River, permit term to February 9, 2027
AMAZON.COM SERVICES LLC - WID1, Idaho Falls: IDNOEJ10I, not classed

Identity

Facility as filed	IDAHO FALLS, CITY OF - IDAHO FALLS WWTP
Permittee as filed	IDAHO FALLS, CITY OF
NPDES ID	ID0021261
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	April 17, 2001
Expiration date	May 22, 2006
Address	Idaho Falls, ID 83402
Receiving water	SNAKE RIVER
Subwatershed	Town of Shelley-Snake River (HUC 170402060301)
Other EPA IDs (FRS)	RCRA handler IDD092027010

Effluent limits and exceedances

21Pollutants on file
18Under a numeric limit
11With 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
Nitrogen, ammonia total [as N]	11	208	204	January 31, 2024	895% over the limit
E. coli, MTEC-MF	2	9	9	October 31, 2012	294% over the limit
Phosphorus, total [as P]	3	8	8	August 31, 2025	155% over the limit
E. coli	0	8	6	August 31, 2022	99,999% over the limit
BOD, 5-day, 20 deg. C	6	5	5	July 31, 2020	13% over the limit
Solids, total suspended	6	1	1	June 30, 2011	136% over the limit
BOD, 5-day, percent removal	1	1	1	September 30, 2018	13% over the limit
Temperature, water deg. centigrade	3	20	0
Flow, in conduit or thru treatment plant	1	2	0
Chromium, hexavalent dissolved [as Cr]	0	2	0
Phosphate, ortho [as P]	0	2	0
pH	4	0	0
Oxygen, dissolved [DO]	3	0	0
Nitrogen, nitrite total [as N]	3	0	0
Nitrogen, nitrate total [as N]	3	0	0
Nitrogen, Kjeldahl, total [as N]	3	0	0
Hardness, total [as CaCO3]	2	0	0
Chlorine, total residual	2	0	0
Coliform, fecal MF, MFC broth, 44.5 C	1	0	0
Flow	1	0	0
Solids, suspended percent removal	1	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES ID0021261.

Inspections

EPA’s inspection file holds no inspection for NPDES ID0021261.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES ID0021261.

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

This public-records page covers the NPDES discharge permit ID0021261 held by Idaho Falls, City of for the Idaho Falls WWTP in Idaho Falls, ID, which discharges to the Snake River. The figures listed are a permit status of Administratively continued, a Major Discharger class, 18 pollutants under a numeric limit, and 7 pollutants with an effluent exceedance.