How much wastewater does Castalia City Of STP treat?

Castalia City Of STP is permitted for a design flow of 0.02 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Castalia City Of STP use?

Klarifi has identified uncovered lagoons at the Castalia facility.

What is the NPDES permit for Castalia City Of STP?

The facility discharges under NPDES permit IA0076236, currently administratively continued, expiring February 2015.

Is Castalia City Of STP in compliance?

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

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

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

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Castalia City Of STP

Castalia, IA · Winneshiek County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.02 MGD

NPDES permit: IA0076236; Administratively continued

Permit expires: February 2015

Population served: 145; CWNS 2022

Castalia City Of STP is a publicly owned wastewater treatment works in Castalia, Winneshiek County, Iowa, serving about 145 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit IA0076236 (administratively continued), which expires in February 2015, with 0 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Uncovered lagoons

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

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Castalia 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 September 11, 2026; facility record last updated February 28, 2025.

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