Three Rivers Regional WWTP
Longview, WA · Cowlitz County · Publicly Owned Treatment Works
- Average flow
- 4.69 MGD
- Design flow
- 52 MGD
- NPDES permit
- 3603465395
- ADC
- Permit expires
- February 2026
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
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Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Longview
| Project | Budget | Years |
|---|---|---|
| Annual Main Replacements | $4,250,000 | 2025–2029 |
| Annual Main Relining | $4,250,000 | 2025–2029 |
| Replace Castleman Line | $2,290,000 | 2029–2029 |
| 2277 48th Pump Station | $2,000,000 | 2028–2029 |
| 5501 Finch Pump Station | $2,000,000 | 2026–2027 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Contacts for Three Rivers Regional WWTP are available in the Klarifi platform.
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Names, validated emails and direct phone numbers for decision-makers at Three Rivers Regional WWTP — plus full compliance history and discharge data.
Try Klarifi freeData sourced from public EPA / NPDES records and Klarifi analysis. Last updated July 2025.