Inwood City Of STP
Inwood, IA 51240 · Lyon County · Publicly Owned Treatment Works
- Average flow
- 0.04 MGD
- Design flow
- —
- NPDES permit
- IA0031232
- Effective
- Permit expires
- August 2029
- Population served
- 894
- CWNS 2022
Inwood City Of STP is a publicly owned wastewater treatment works in Inwood, Lyon County, Iowa treating an average of 0.04 million gallons per day, serving about 894 residents. It discharges under NPDES permit IA0031232 (effective), which expires in August 2029, with 1 recorded violation in the last three years.
Treatment technology
One treatment structure or unit process identified at Inwood City Of STP.
Available with a free Klarifi account
See the full treatment train at Inwood City Of STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Inwood City Of STP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Inwood City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Alvord · 7 mi away
—
Lester · 9 mi away
0.07 MGD
Larchwood · 9 mi away
—
Doon · 11 mi away
—
Rock Rapids · 16 mi away
0.28 MGD
Hull · 17 mi away
0.21 MGD
Sioux Center · 21 mi away
0.97 MGD
George · 21 mi away
0.08 MGD
Inwood 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 March 17, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms