Lake Mills City Of STP
Lake Mills, IA 50450 · Winnebago County · Publicly Owned Treatment Works
- Average flow
- 0.28 MGD
- Design flow
- 1 MGD
- NPDES permit
- IA0027448
- Effective
- Permit expires
- May 2027
- Population served
- 2,240
- CWNS 2022
Lake Mills City Of STP is a publicly owned wastewater treatment works in Lake Mills, Winnebago County, Iowa treating an average of 0.28 million gallons per day against a permitted design capacity of 1 MGD, serving about 2,240 residents. It discharges under NPDES permit IA0027448 (effective), which expires in May 2027, with 71 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Lake Mills City Of STP.
Available with a free Klarifi account
See the full treatment train at Lake Mills City Of STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 71
- Effluent violations
- 71
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Industrial users and pretreatment
Industries that discharge process wastewater to Lake Mills City Of STP, from the plant's pretreatment programme records.
- Industrial users
- 2
- on record
On record: Central Disposal Systems INC (Lake Mills); Dielectric Corporation (Lake Mills). Most users are in automotive, metal and equipment manufacturing and landfills and waste management.
Unlock the details behind these industrial users
Discharge flow, federal category, source documents and contacts for every industrial user of Lake Mills City Of STP. Free with a Klarifi account.
Key contacts
1 verified contact for Lake Mills 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 Lake Mills City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Joice · 7 mi away
—
Leland · 7 mi away
—
Thompson · 12 mi away
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Forest City · 12 mi away
0.69 MGD
Fertile · 12 mi away
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Northwood · 16 mi away
0.21 MGD
Kensett · 18 mi away
—
Crystal Lake · 18 mi away
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Lake Mills 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 7, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms