Clean Water Act discharge permit · NPDES OR0020621
ONTARIO STP, Ontario, OR: NPDES OR0020621 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 13Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
ONTARIO STP, held by ONTARIO, CITY OF, holds NPDES permit OR0020621, which discharges to Snake River. EPA’s file records it issued December 21, 2018 and expiring November 30, 2023. 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 filed | ONTARIO STP |
|---|---|
| Permittee as filed | ONTARIO, CITY OF |
| NPDES ID | OR0020621 |
| 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 | December 21, 2018 |
| Expiration date | November 30, 2023 |
| Address | Ontario, OR 97914 |
| Receiving water | SNAKE RIVER |
| Subwatershed | Malheur River (HUC 170501170603) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 13Pollutants on file
- 13Under a numeric limit
- 11With a violation of any kind
- 5With 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, 20 deg. C | 7 | 11 | 10 | April 30, 2020 | 70% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 22 | 6 | January 31, 2021 | 44% over the limit |
| Arsenic, Inorganic | 2 | 4 | 2 | November 30, 2021 | 16% over the limit |
| E. coli | 4 | 165 | 1 | December 31, 2013 | 13% over the limit |
| pH | 2 | 3 | 1 | April 30, 2022 | |
| Mercury, total [as Hg] | 8 | 4 | 0 | ||
| Report due [yrmoda] | 3 | 2 | 0 | ||
| Sulfide-hydrogen sulfide [undissociated] | 2 | 2 | 0 | ||
| Flow, total | 1 | 2 | 0 | ||
| Solids, total suspended | 6 | 1 | 0 | ||
| Flow, in conduit or thru treatment plant | 1 | 1 | 0 | ||
| Chlorine, total residual | 2 | 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
- 14Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 12, 2025 | Reporting Violations - Failure to Submit DMRs | ST6 |
| May 1, 2024 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| March 1, 2024 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| January 16, 2024 | Failure to provide complete and accurate information (not related to annual report) | ST6 |
| September 3, 2022 | Effluent Violations - Unauthorized Discharge | ST6 |
| January 1, 2022 | Effluent Violations - Numeric effluent violation | ST6 |
| February 1, 2021 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| January 1, 2020 | Effluent Violations - Numeric effluent violation | ST6 |
| January 1, 2020 | Reporting Violations - Failure to Submit DMRs | ST6 |
| February 1, 2019 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| December 31, 2017 | Effluent Violations - Numeric effluent violation | ST6 |
| November 30, 2017 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| November 21, 2017 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| March 1, 2017 | Permit Violations - Unapproved Operation | 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, OR0020621.
Start the watch
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- One watershed — $2,990/year
- One state — $4,990/year
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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 OR0020621 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.