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
- Administratively continuedPermit status
- MajorDischarger class
- 11Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
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 (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | TWIN FALLS, CITY OF - TWIN FALLS WWTP |
|---|---|
| Permittee as filed | TWIN FALLS, CITY OF |
| NPDES ID | ID0021270 |
| 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 | March 28, 2000 |
| Expiration date | May 1, 2005 |
| Issuing agency | U.S. EPA, REGION 10 |
| Address | Twin Falls, ID 83301 |
| Receiving water | SNAKE RIVER RM 608.5 |
| Subwatershed | City of Twin Falls (HUC 170402120503) |
| Program components on file | Biosolids, POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler IDD000712281; ICIS-AIR source ID000000160830003 |
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
- 14Pollutants on file
- 11Under a numeric limit
- 9With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 6 | 38 | 38 | October 31, 2025 | 293% over the limit |
| E. coli, MTEC-MF | 0 | 11 | 11 | July 31, 2025 | 496% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 10 | 10 | December 31, 2014 | 53% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 7 | 7 | April 30, 2025 | 331% over the limit |
| Coliform, fecal MF, MFC broth, 44.5 C | 2 | 7 | 7 | December 31, 2002 | 503% over the limit |
| Phosphorus, total [as P] | 4 | 2 | 2 | May 31, 2026 | 4% over the limit |
| Solids, suspended percent removal | 1 | 2 | 2 | April 30, 2012 | 33% over the limit |
| Temperature, water deg. centigrade | 0 | 2 | 0 | ||
| Toxicity, final conc toxicity units | 0 | 1 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| Nitrogen, nitrate total [as N] | 1 | 0 | 0 | ||
| BOD, 5-day, percent removal | 1 | 0 | 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
- 0Single-event violations
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
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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 ID0021270 there.
Nearby on the register
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- Every permit record in Idaho, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.