Medical Lake WWTP
Medical Lake, WA · Spokane County · Publicly Owned Treatment Works
- Average flow
- 0.27 MGD
- Design flow
- 24.6 MGD
- NPDES permit
- WA0021148
- Administratively continued
- Permit expires
- July 2019
- Population served
- 5,620
- CWNS 2022
Medical Lake WWTP is a publicly owned wastewater treatment works in Medical Lake, Spokane County, Washington treating an average of 0.27 million gallons per day against a permitted design capacity of 24.6 MGD, serving about 5,620 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit WA0021148 (administratively continued), which expires in July 2019, with 13 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
- 13
- Effluent violations
- 13
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Medical Lake WWTP.
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Nearby wastewater treatment plants in Washington
Reardan · 11 mi away
0.03 MGD
Spokane · 12 mi away
31.72 MGD
Spangle · 17 mi away
0.0086 MGD
Davenport · 22 mi away
0.15 MGD
Rockford · 27 mi away
0.00029 MGD
Fairfield · 27 mi away
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Rosalia · 28 mi away
—
Tekoa · 37 mi away
0.05 MGD
Medical Lake 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 September 11, 2026; facility record last updated November 29, 2025.