Grants Pass STP
Grants Pass, OR · Josephine County · Publicly Owned Treatment Works
- Average flow
- 4.48 MGD
- Design flow
- 4 MGD
- NPDES permit
- OR0028843
- Administratively continued
- Permit expires
- September 2014
- Population served
- 49,734
- CWNS 2022
Grants Pass STP is a publicly owned wastewater treatment works in Grants Pass, Josephine County, Oregon treating an average of 4.48 million gallons per day against a permitted design capacity of 4 MGD, serving about 49,734 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos. It discharges under NPDES permit OR0028843 (administratively continued), which expires in September 2014, with 16 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 16
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Grants Pass STP, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Grants Pass STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Oregon
Merlin · 6 mi away
0.008 MGD
Gold Hill · 14 mi away
0.06 MGD
Glendale · 22 mi away
0.07 MGD
Central Point · 22 mi away
14.5 MGD
Cave Junction · 24 mi away
0.19 MGD
Shady Cove · 28 mi away
0.29 MGD
Ashland · 35 mi away
1.71 MGD
Canyonville · 35 mi away
0.16 MGD
Grants Pass STP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated April 6, 2025.