What is the address of Castalia City Of STP?

The address on the plant’s EPA facility record is 1/2 Mi. East Of Centenial Rd & Greene St Intersect, Castalia, IA 52133, in Winneshiek County. Its coordinates are 43.1136, -91.6684. For some plants the record holds the utility’s mailing address rather than the plant gate.

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 one treatment structure or unit process at the Castalia facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

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.

Try for free Log in

Castalia City Of STP

1/2 Mi. East Of Centenial Rd & Greene St Intersect, Castalia, IA 52133 · 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. It discharges under NPDES permit IA0076236 (administratively continued), which expires in February 2015, with 0 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Castalia City Of STP.

Available with a free Klarifi account

See the full treatment train at Castalia 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 Castalia 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 Castalia City Of STP, plus the full compliance history and discharge data.

Try Klarifi free

Nearby wastewater treatment plants in Iowa

Postville City Of STP

Postville · 6 mi away

0.31 MGD

Ossian City Of STP

Ossian · 6 mi away

0.18 MGD

Clermont WWTP

Clermont · 8 mi away

0.03 MGD

Calmar City Of STP

Calmar · 11 mi away

0.14 MGD

Elgin WWTP

Elgin · 11 mi away

0.04 MGD

Luana City Of STP

Luana · 12 mi away

—

West Union City Of STP

West Union · 13 mi away

0.37 MGD

Fort Atkinson City Of STP

Fort Atkinson · 13 mi away

—

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 October 26, 2026; facility record last updated February 28, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms

Try Klarifi for free

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

Try for free