College Place WWTP
430 Owens Rd, Walla Walla, WA 99362 · Walla Walla County · Publicly Owned Treatment Works
- Average flow
- 0.87 MGD
- Design flow
- —
- NPDES permit
- WA0020656
- Administratively continued
- Permit expires
- February 2019
- Population served
- 9,775
- CWNS 2022
College Place WWTP is a publicly owned wastewater treatment works in Walla Walla, Walla Walla County, Washington treating an average of 0.87 million gallons per day, serving about 9,775 residents. It discharges under NPDES permit WA0020656 (administratively continued), which expires in February 2019, with 21 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in March 2025.
Treatment technology
2 treatment structures and unit processes identified at College Place WWTP.
Available with a free Klarifi account
See the full treatment train at College Place WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 21
- Effluent violations
- 19
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for College Place WWTP in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Penalties assessed
- $1,350
- all cases
- Compliance actions
- $3,500
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Mar 2025
CITY OF COLLEGE PLACE (CWA NPDES)
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $1,350 · Compliance actions $3,500
EPA's description of the case:
“On February 28, 2025, Region 10 filed an Expedited Settlement Agreement resolving CWA violations at The City of College Place Wastewater Treatment Plant in College Place, Washington. Alleged…”
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Source: EPA ECHO, civil enforcement case 10-2025-0028.
Full case history with a free Klarifi account
Every action against College Place WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Capital improvement projects in Walla Walla
Walla Walla's capital improvement plan lists 40 water, sewer and wastewater line items worth $50M starting 2024–2030. The largest budgeted items are shown here.
All water and sewer capital projects in Walla Walla →
| Project | Budget | Years |
|---|---|---|
| Sewer Main Replacement Project | $10,664,000 | 2025–2030 |
| WWTP - Phase 2 Digester Upgrade | $10,000,000 | 2024–2026 |
| WWTP - Phase 3 Plant Upgrade Project | $4,000,000 | 2025–2027 |
| Well 5 Conversion to ASR Well | $3,200,000 | 2027–2028 |
| Solar Panels and back-up battery | $2,600,000 | 2024–2025 |
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
8 verified contacts for College Place WWTP, with validated emails and direct phone numbers.
Unlock 8 verified contacts (5 more than shown)
Names, validated emails and direct phone numbers for decision-makers at College Place WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Walla Walla · 3 mi away
—
Waitsburg · 20 mi away
0.16 MGD
Dayton · 28 mi away
0.25 MGD
Pasco · 35 mi away
—
Richland · 44 mi away
5.91 MGD
Pomeroy · 49 mi away
0.12 MGD
Benton City · 53 mi away
0.23 MGD
Prosser · 66 mi away
0.74 MGD
College Place WWTP: 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 October 19, 2026; facility record last updated October 10, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms