West Boise WWTP
Garden City, ID · Ada County · Publicly Owned Treatment Works
- Average flow
- 62 MGD
- Design flow
- 24 MGD
- NPDES permit
- ID0023981
- Effective
- Permit expires
- June 2027
- Population served
- 380,979
- CWNS 2022
West Boise WWTP is a publicly owned wastewater treatment works in Garden City, Ada County, Idaho treating an average of 62 million gallons per day against a permitted design capacity of 24 MGD, serving about 380,979 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos. It discharges under NPDES permit ID0023981 (effective), which expires in June 2027, with 9 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
- 9
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for West Boise WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at West Boise WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Idaho
Star · 8 mi away
1.58 MGD
Meridian · 10 mi away
1.23 MGD
Nampa · 13 mi away
—
Emmett · 17 mi away
1.76 MGD
Horseshoe Bend · 18 mi away
0.07 MGD
Greenleaf · 24 mi away
—
Notus · 24 mi away
—
Marsing · 25 mi away
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West Boise 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 August 19, 2026.