Clean Water Act discharge permit · NPDES OR0022454
YONCALLA STP, Yoncalla, OR: NPDES OR0022454 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 11Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
YONCALLA STP, held by YONCALLA, CITY OF, holds NPDES permit OR0022454, which discharges to Yoncalla Creek. EPA’s file records it issued March 27, 2006 and expiring February 28, 2011. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | YONCALLA STP |
|---|---|
| Permittee as filed | YONCALLA, CITY OF |
| NPDES ID | OR0022454 |
| 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 27, 2006 |
| Expiration date | February 28, 2011 |
| Address | Yoncalla, OR 97499 |
| Receiving water | YONCALLA CREEK |
| Subwatershed | Yoncalla Creek (HUC 171003030303) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 13Pollutants on file
- 11Under a numeric limit
- 10With a violation of any kind
- 8With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, percent removal | 1 | 22 | 22 | April 30, 2026 | 288% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 9 | 7 | March 31, 2026 | 60% over the limit |
| Chlorine, total residual | 2 | 9 | 7 | March 31, 2023 | 200% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 7 | 6 | May 31, 2025 | 2,147,483,650% over the limit |
| Solids, total suspended | 6 | 7 | 5 | November 30, 2025 | 95% over the limit |
| pH | 4 | 6 | 5 | March 31, 2026 | |
| Solids, suspended percent removal | 1 | 4 | 4 | April 30, 2026 | 14% over the limit |
| E. coli | 4 | 7 | 3 | January 31, 2026 | 496% over the limit |
| Alkalinity, total [as CaCO3] | 0 | 2 | 0 | ||
| Temperature, water deg. centigrade | 0 | 1 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 0 | 0 | ||
| Flow, total | 1 | 0 | 0 | ||
| Chlorine usage | 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
- 14Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 15, 2024 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| November 11, 2023 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| February 15, 2023 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| January 1, 2023 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| December 1, 2022 | Effluent Violations - Numeric effluent violation | ST6 |
| November 1, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| November 1, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| October 1, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| August 1, 2021 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| August 1, 2021 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| May 1, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| March 31, 2017 | Reporting Violations - Failure to Submit DMRs | ST6 |
| January 1, 2017 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| January 1, 2017 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
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, OR0022454.
Start the watch
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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 OR0022454 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.