What is the address of Marquette WWTP?

The address on the plant’s EPA facility record is 515 Hwy 18 West, Marquette, IA 52158, in Clayton County. Its coordinates are 43.0434, -91.1927. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Marquette WWTP treat?

Marquette WWTP treats an average of 0.03 MGD and is permitted for a design flow of 0.23 MGD.

What treatment technology does Marquette WWTP use?

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

What is the NPDES permit for Marquette WWTP?

The facility discharges under NPDES permit IA0059463, currently effective, expiring February 2027.

Is Marquette WWTP in compliance?

Discharge monitoring reports show 1 violation at Marquette WWTP in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Marquette WWTP and how do I contact them?

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

Try for free Log in

Marquette WWTP

515 Hwy 18 West, Marquette, IA 52158 · Clayton County · Publicly Owned Treatment Works

Average flow: 0.03 MGD

Design flow: 0.23 MGD

NPDES permit: IA0059463; Effective

Permit expires: February 2027

Population served: 429; CWNS 2022

Marquette WWTP is a publicly owned wastewater treatment works in Marquette, Clayton County, Iowa treating an average of 0.03 million gallons per day against a permitted design capacity of 0.23 MGD, serving about 429 residents. It discharges under NPDES permit IA0059463 (effective), which expires in February 2027, with 1 recorded violation in the last three years.

Treatment technology

One treatment structure or unit process identified at Marquette WWTP.

Available with a free Klarifi account

See the full treatment train at Marquette WWTP: structures, unit processes and planned upgrades, with exact unit counts.

Create a free account

Compliance snapshot (last 3 years)

Total violations: 1

Effluent violations: 1

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

Key contacts

1 verified contact for Marquette WWTP, with validated emails and direct phone numbers.

Unlock 1 verified contact

Names, validated emails and direct phone numbers for decision-makers at Marquette WWTP, plus the full compliance history and discharge data.

Try Klarifi free

Nearby wastewater treatment plants in Iowa

Mcgregor WWTP

Mcgregor · 2 mi away

0.04 MGD

Monona WWTP

Monona · 11 mi away

0.16 MGD

Harpers Ferry, City Of STP

Harpers Ferry · 12 mi away

0.02 MGD

Saint Olaf City Of STP

Saint Olaf · 13 mi away

0.0055 MGD

Luana City Of STP

Luana · 13 mi away

—

Garnavillo City Of STP

Garnavillo · 13 mi away

0.06 MGD

Elkader WWTP

Elkader · 17 mi away

0.1 MGD

Postville City Of STP

Postville · 19 mi away

0.31 MGD

Marquette WWTP: 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 October 9, 2026.

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