Benton City STP
100 Dinah Ln, Benton City, WA 99320 · Benton County · Publicly Owned Treatment Works
- Average flow
- 0.23 MGD
- Design flow
- —
- NPDES permit
- WA0051349
- Administratively continued
- Permit expires
- August 2019
- Population served
- 3,600
- CWNS 2022
Benton City STP is a publicly owned wastewater treatment works in Benton City, Benton County, Washington treating an average of 0.23 million gallons per day, serving about 3,600 residents. It discharges under NPDES permit WA0051349 (administratively continued), which expires in August 2019, with 0 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Benton City STP.
Available with a free Klarifi account
See the full treatment train at Benton City STP: structures, unit processes and planned upgrades, with exact unit counts.
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.
Key contacts
Decision-makers at Benton City STP.
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Nearby wastewater treatment plants in Washington
Richland · 10 mi away
5.91 MGD
Prosser · 14 mi away
0.74 MGD
Pasco · 19 mi away
—
Grandview · 21 mi away
0.93 MGD
Mabton · 24 mi away
0.15 MGD
Sunnyside · 26 mi away
1.64 MGD
Sunnyside · 26 mi away
1.34 MGD
Granger · 34 mi away
0.17 MGD
Benton City 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 October 26, 2026; facility record last updated November 20, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms