How much wastewater does Garnavillo City Of STP treat?

Garnavillo City Of STP treats an average of 0.06 MGD and is permitted for a design flow of 0.46 MGD.

What treatment technology does Garnavillo City Of STP use?

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

What is the NPDES permit for Garnavillo City Of STP?

The facility discharges under NPDES permit IA0026697, currently effective, expiring August 2031.

Is Garnavillo City Of STP in compliance?

Discharge monitoring reports show 16 violations at Garnavillo City Of STP in the last three years, 10 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Garnavillo City Of STP

Garnavillo, IA 52049 · Clayton County · Publicly Owned Treatment Works

Average flow: 0.06 MGD

Design flow: 0.46 MGD

NPDES permit: IA0026697; Effective

Permit expires: August 2031

Population served: 760; CWNS 2022

Garnavillo City Of STP is a publicly owned wastewater treatment works in Garnavillo, Clayton County, Iowa treating an average of 0.06 million gallons per day against a permitted design capacity of 0.46 MGD, serving about 760 residents. It discharges under NPDES permit IA0026697 (effective), which expires in August 2031, with 16 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 16

Effluent violations: 10

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

Decision-makers at Garnavillo City Of STP.

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Nearby wastewater treatment plants in Iowa

Elkader WWTP

Elkader · 8 mi away

0.1 MGD

Saint Olaf City Of STP

Saint Olaf · 9 mi away

0.0055 MGD

Guttenberg WWTP

Guttenberg · 9 mi away

0.26 MGD

Mcgregor WWTP

Mcgregor · 12 mi away

0.04 MGD

Marquette WWTP

Marquette · 13 mi away

0.03 MGD

Monona WWTP

Monona · 15 mi away

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Luana City Of STP

Luana · 18 mi away

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Edgewood WWTP

Edgewood · 18 mi away

0.2 MGD

Garnavillo 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 September 28, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms

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