How much wastewater does Calmar City Of STP treat?

Calmar City Of STP treats an average of 0.14 MGD and is permitted for a design flow of 0.8 MGD.

What treatment technology does Calmar City Of STP use?

Klarifi has identified 2 treatment structures and unit processes at the Calmar facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Calmar City Of STP?

The facility discharges under NPDES permit IA0023515, currently effective, expiring July 2030.

Is Calmar City Of STP in compliance?

Discharge monitoring reports show no violations at Calmar City Of STP in the last three years.

Who operates Calmar City Of STP and how do I contact them?

Calmar City Of STP is a publicly owned treatment works in Calmar, Iowa. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

Try for free Log in

Calmar City Of STP

Calmar, IA 52132 · Winneshiek County · Publicly Owned Treatment Works

Average flow: 0.14 MGD

Design flow: 0.8 MGD

NPDES permit: IA0023515; Effective

Permit expires: July 2030

Population served: 1,125; CWNS 2022

Calmar City Of STP is a publicly owned wastewater treatment works in Calmar, Winneshiek County, Iowa treating an average of 0.14 million gallons per day against a permitted design capacity of 0.8 MGD, serving about 1,125 residents. It discharges under NPDES permit IA0023515 (effective), which expires in July 2030, with 0 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Calmar City Of STP.

Available with a free Klarifi account

See the full treatment train at Calmar City Of STP: structures, unit processes and planned upgrades, with exact unit counts.

Create a free account

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 Calmar 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 Calmar City Of STP, plus the full compliance history and discharge data.

Try Klarifi free

Nearby wastewater treatment plants in Iowa

Fort Atkinson City Of STP

Fort Atkinson · 4 mi away

—

Spillville City Of STP

Spillville · 4 mi away

—

Ossian City Of STP

Ossian · 5 mi away

0.18 MGD

St Lucas WWTP

St Lucas · 8 mi away

—

Festina-Winneshiek County-STP

Decorah · 9 mi away

0.0067 MGD

Decorah City Of STP

Decorah · 10 mi away

0.92 MGD

Ridgeway City Of STP

Ridgeway · 10 mi away

0.02 MGD

Castalia City Of STP

Castalia · 11 mi away

—

Calmar 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 6, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free