Clean Water Act discharge permit · NPDES OR0029777
ROCK CREEK STP, Hillsboro, OR: NPDES OR0029777 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 28Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
ROCK CREEK STP, held by CLEAN WATER SERVICES, holds NPDES permit OR0029777, which discharges to Tualatin River (Rm 38). 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 | ROCK CREEK STP |
|---|---|
| Permittee as filed | CLEAN WATER SERVICES |
| NPDES ID | OR0029777 |
| 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 97123 |
| Receiving water | TUALATIN RIVER (RM 38) |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lower Rock Creek (HUC 170900100403) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler ORQ000014522 |
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
- 28Pollutants on file
- 28Under a numeric limit
- 27With a violation of any kind
- 6With 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 | 37 | 40 | 6 | June 30, 2010 | 297% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 31 | 40 | 4 | December 31, 2007 | 90% over the limit |
| pH, maximum | 2 | 16 | 2 | April 30, 2017 | |
| Phosphorus, total [as P] | 6 | 14 | 2 | September 30, 2025 | 110% over the limit |
| pH, minimum | 2 | 15 | 1 | January 31, 2017 | |
| E. coli | 8 | 13 | 1 | December 31, 2006 | 69% over the limit |
| Nitrogen, ammonia total [as N] | 19 | 53 | 0 | ||
| Methylmercury | 8 | 40 | 0 | ||
| Oxygen, dissolved [DO] | 5 | 25 | 0 | ||
| Flow rate | 2 | 22 | 0 | ||
| Mercury, dissolved [as Hg] | 4 | 20 | 0 | ||
| Mercury, total [as Hg] | 4 | 20 | 0 | ||
| Nitrogen, ammonia dissolved | 2 | 20 | 0 | ||
| Duration | 2 | 16 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 13 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 13 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 12 | 0 | ||
| Chlorine usage | 1 | 12 | 0 | ||
| Chlorine, total residual | 4 | 6 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 6 | 0 | ||
| Excess thermal load | 3 | 5 | 0 | ||
| Solids, total dissolved | 1 | 5 | 0 | ||
| pH range excursions, > 60 minutes | 2 | 4 | 0 | ||
| Alkalinity, total [as CaCO3] | 1 | 4 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 3 | 0 | ||
| Solids, suspended percent removal | 2 | 3 | 0 | ||
| pH range excursions, monthly total accum | 2 | 3 | 0 | ||
| pH | 2 | 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 OR0029777.
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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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 OR0029777 there.
Nearby on the register
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- Every permit record in Oregon, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.