Granger POTW
503 Main St, Granger, WA 98932 · Yakima County · Publicly Owned Treatment Works
- Average flow
- 0.17 MGD
- Design flow
- 0.64 MGD
- NPDES permit
- WA0022691
- Effective
- Permit expires
- August 2031
- Population served
- 3,743
- CWNS 2022
Granger POTW is a publicly owned wastewater treatment works in Granger, Yakima County, Washington treating an average of 0.17 million gallons per day against a permitted design capacity of 0.64 MGD, serving about 3,743 residents. It discharges under NPDES permit WA0022691 (effective), which expires in August 2031, with 175 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Granger POTW.
Available with a free Klarifi account
See the full treatment train at Granger POTW: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 175
- Effluent violations
- 21
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Granger POTW.
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Nearby wastewater treatment plants in Washington
Toppenish · 5 mi away
0.66 MGD
Zillah · 5 mi away
0.2 MGD
Toppenish · 7 mi away
0.09 MGD
Zillah · 8 mi away
0.08 MGD
Sunnyside · 9 mi away
1.34 MGD
Sunnyside · 9 mi away
1.64 MGD
Mabton · 12 mi away
0.15 MGD
Grandview · 16 mi away
0.93 MGD
Granger POTW: 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 September 16, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms