Clean Water Act discharge permit · NPDES OR0023345
HILLSBORO-WESTSIDE STP, Hillsboro, OR: NPDES OR0023345 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 20Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
HILLSBORO-WESTSIDE STP, held by CLEAN WATER SERVICES, holds NPDES permit OR0023345, which discharges to Tualatin River (Rm 44). 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 (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | HILLSBORO-WESTSIDE STP |
|---|---|
| Permittee as filed | CLEAN WATER SERVICES |
| NPDES ID | OR0023345 |
| 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 | Hillsboro, OR 97120 |
| Receiving water | TUALATIN RIVER (RM 44) |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Davis Creek-Tualatin River (HUC 170900100404) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 21Pollutants on file
- 20Under a numeric limit
- 21With a violation of any kind
- 1With 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 |
|---|---|---|---|---|---|
| E. coli | 4 | 18 | 1 | May 31, 2018 | 31% over the limit |
| Nitrogen, ammonia total [as N] | 13 | 43 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 13 | 35 | 0 | ||
| Methylmercury | 8 | 34 | 0 | ||
| Solids, total suspended | 18 | 29 | 0 | ||
| pH | 4 | 28 | 0 | ||
| Flow rate | 2 | 21 | 0 | ||
| Flow, in conduit or thru treatment plant | 5 | 20 | 0 | ||
| Mercury, dissolved [as Hg] | 4 | 18 | 0 | ||
| Mercury, total [as Hg] | 4 | 18 | 0 | ||
| Oxygen, dissolved [DO] | 4 | 17 | 0 | ||
| Phosphorus, total [as P] | 4 | 15 | 0 | ||
| Ultraviolet light dosage | 2 | 15 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 10 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 8 | 0 | ||
| Temperature, water deg. centigrade | 2 | 6 | 0 | ||
| Solids, total dissolved | 1 | 5 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 1 | 4 | 0 | ||
| Solids, suspended percent removal | 1 | 4 | 0 | ||
| Alkalinity, total [as CaCO3] | 1 | 3 | 0 | ||
| Oil & Grease | 0 | 1 | 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 OR0023345.
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, OR0023345.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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 OR0023345 there.
Nearby on the register
- Discharge permits in Hillsboro
- Every permit record in Hillsboro, A to Z
- Discharge permits in Oregon
- Every permit record in Oregon, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.