Callender City Of STP
East Of Town & 0.13 Miles North Of 295th Street, Callender, IA 50523 · Webster County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.5 MGD
- NPDES permit
- IA0057096
- Effective
- Permit expires
- July 2028
- Population served
- 368
- CWNS 2022
Callender City Of STP is a publicly owned wastewater treatment works in Callender, Webster County, Iowa, serving about 368 residents. It discharges under NPDES permit IA0057096 (effective), which expires in July 2028, with 9 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Callender City Of STP.
Available with a free Klarifi account
See the full treatment train at Callender City Of STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 9
- Effluent violations
- 9
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Callender 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 Callender City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Gowrie · 7 mi away
0.09 MGD
Harcourt · 9 mi away
—
Farnhamville · 9 mi away
0.03 MGD
Fort Dodge · 10 mi away
11.42 MGD
Rinard · 10 mi away
0.0018 MGD
Barnum · 11 mi away
—
Lehigh · 12 mi away
—
Dayton · 14 mi away
—
Callender 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 February 2, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms