Garrison WWTP
Garrison, IA · Benton County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.27 MGD
- NPDES permit
- IA0056804
- Effective
- Permit expires
- May 2028
- Population served
- 344
- CWNS 2022
Garrison WWTP is a publicly owned wastewater treatment works in Garrison, Benton County, Iowa, serving about 344 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit IA0056804 (effective), which expires in May 2028, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Garrison WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Garrison WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Mount Auburn · 8 mi away
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Van Horne · 9 mi away
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Newhall · 13 mi away
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Elberon · 13 mi away
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Brandon · 14 mi away
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Urbana · 14 mi away
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Clutier · 14 mi away
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Shellsburg · 14 mi away
0.13 MGD
Garrison 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 February 28, 2025.