Harpers Ferry, City Of STP
1009 Winfield Road, Harpers Ferry, IA 52146 · Allamakee County · Publicly Owned Treatment Works
- Average flow
- 0.02 MGD
- Design flow
- 0.14 MGD
- NPDES permit
- IA0070564
- Effective
- Permit expires
- July 2027
- Population served
- 262
- CWNS 2022
Harpers Ferry, City Of STP is a publicly owned wastewater treatment works in Harpers Ferry, Allamakee County, Iowa treating an average of 0.02 million gallons per day against a permitted design capacity of 0.14 MGD, serving about 262 residents. It discharges under NPDES permit IA0070564 (effective), which expires in July 2027, with 0 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Harpers Ferry, City Of STP.
Available with a free Klarifi account
See the full treatment train at Harpers Ferry, City Of 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
1 verified contact for Harpers Ferry, City Of STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Harpers Ferry, City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Lansing · 10 mi away
0.08 MGD
Marquette · 12 mi away
0.03 MGD
Mcgregor · 14 mi away
0.04 MGD
Waukon · 17 mi away
0.71 MGD
Monona · 18 mi away
0.16 MGD
Luana · 19 mi away
—
New Albin · 21 mi away
0.03 MGD
Postville · 23 mi away
0.31 MGD
Harpers Ferry, City Of 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 August 18, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms