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Clean Water Act discharge permit · NPDES ID0021270

TWIN FALLS, CITY OF - TWIN FALLS WWTP, Twin Falls, ID: NPDES ID0021270 discharge permit, effluent exceedances, inspections, penalties

TWIN FALLS, CITY OF - TWIN FALLS WWTP, held by TWIN FALLS, CITY OF, holds NPDES permit ID0021270, which discharges to Snake River Rm 608.5. EPA’s file records it issued March 28, 2000 and expiring May 1, 2005. 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 filedTWIN FALLS, CITY OF - TWIN FALLS WWTP
Permittee as filedTWIN FALLS, CITY OF
NPDES IDID0021270
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
IssuedMarch 28, 2000
Expiration dateMay 1, 2005
Issuing agencyU.S. EPA, REGION 10
AddressTwin Falls, ID 83301
Receiving waterSNAKE RIVER RM 608.5
SubwatershedCity of Twin Falls (HUC 170402120503)

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

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
Solids, total suspended63838October 31, 2025293% over the limit
E. coli, MTEC-MF01111July 31, 2025496% over the limit
BOD, 5-day, 20 deg. C61010December 31, 201453% over the limit
Nitrogen, ammonia total [as N]677April 30, 2025331% over the limit
Coliform, fecal MF, MFC broth, 44.5 C277December 31, 2002503% over the limit
Phosphorus, total [as P]422May 31, 20264% over the limit
Solids, suspended percent removal122April 30, 201233% over the limit
Temperature, water deg. centigrade020
Toxicity, final conc toxicity units010
pH200
Flow, in conduit or thru treatment plant200
Chlorine, total residual200
Nitrogen, nitrate total [as N]100
BOD, 5-day, percent removal100

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES ID0021270.

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

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, ID0021270.

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How we handle your data → Privacy

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 ID0021270 there.

Nearby on the register

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