Clean Water Act discharge permit · NPDES OR0028118
DURHAM STP, Tigard, OR: NPDES OR0028118 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 28Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
DURHAM STP, held by CLEAN WATER SERVICES, holds NPDES permit OR0028118, which discharges to Tualatin River. EPA’s file records it issued June 1, 2016 and expiring May 31, 2021. 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 | DURHAM STP |
|---|---|
| Permittee as filed | CLEAN WATER SERVICES |
| NPDES ID | OR0028118 |
| 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 | June 1, 2016 |
| Expiration date | May 31, 2021 |
| Address | Tigard, OR 97224 |
| Receiving water | TUALATIN RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Fanno Creek (HUC 170900100502) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 29Pollutants on file
- 28Under a numeric limit
- 28With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 4 | 20 | 2 | October 31, 2016 | 982% over the limit |
| Chlorine, total residual | 4 | 10 | 2 | August 31, 2012 | 95% over the limit |
| Solids, total suspended | 31 | 67 | 1 | January 31, 2024 | 5% over the limit |
| pH | 2 | 1 | 1 | September 30, 2015 | |
| Nitrogen, ammonia total [as N] | 21 | 105 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 19 | 41 | 0 | ||
| Methylmercury | 8 | 32 | 0 | ||
| Flow rate | 2 | 28 | 0 | ||
| Oxygen, dissolved [DO] | 5 | 25 | 0 | ||
| Nitrogen, ammonia dissolved | 2 | 20 | 0 | ||
| pH, maximum | 2 | 17 | 0 | ||
| pH, minimum | 2 | 17 | 0 | ||
| E. coli | 8 | 16 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 16 | 0 | ||
| Mercury, dissolved [as Hg] | 4 | 16 | 0 | ||
| Mercury, total [as Hg] | 4 | 16 | 0 | ||
| Chlorine usage | 3 | 15 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 14 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 14 | 0 | ||
| Excess thermal load | 3 | 9 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 6 | 0 | ||
| pH range excursions, > 60 minutes | 2 | 6 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 4 | 0 | ||
| Solids, suspended percent removal | 2 | 4 | 0 | ||
| pH range excursions, monthly total accum | 2 | 4 | 0 | ||
| Alkalinity, total [as CaCO3] | 1 | 4 | 0 | ||
| Solids, total dissolved | 1 | 4 | 0 | ||
| Report due [yrmoda] | 0 | 1 | 0 | ||
| Duration | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 3, 2021 | WW SSO - Discharge to Waters | ST6 |
| November 20, 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.
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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 OR0028118 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.