What is the address of Iroquois, City Of?

The address on the plant’s EPA facility record is PO Box 127, Iroquois, SD 57353, in Kingsbury County. Its coordinates are 44.3553, -97.8477. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Iroquois, City Of treat?

Iroquois, City Of treats an average of 0.14 MGD and is permitted for a design flow of 0.2 MGD.

What treatment technology does Iroquois, City Of use?

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

What is the NPDES permit for Iroquois, City Of?

The facility discharges under NPDES permit SDG922438, currently administratively continued, expiring August 2026.

Is Iroquois, City Of in compliance?

Discharge monitoring reports show 33 violations at Iroquois, City Of in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Iroquois, City Of and how do I contact them?

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

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Iroquois, City Of

PO Box 127, Iroquois, SD 57353 · Kingsbury County · Publicly Owned Treatment Works

Average flow: 0.14 MGD

Design flow: 0.2 MGD

NPDES permit: SDG922438; Administratively continued

Permit expires: August 2026

Population served: —; CWNS 2022

Iroquois, City Of is a publicly owned wastewater treatment plant in Iroquois, Kingsbury County, South Dakota treating an average of 0.14 million gallons per day against a permitted design capacity of 0.2 MGD. It discharges under NPDES permit SDG922438 (administratively continued), which expires in August 2026, with 33 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Iroquois, City Of.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 33

Effluent violations: 1

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

Key contacts

Decision-makers at Iroquois, City Of.

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Nearby wastewater treatment plants in South Dakota

Cavour, Town Of

Cavour · 10 mi away

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Huron, City Of

Huron · 17 mi away

4.88 MGD

Bryant, City Of

Bryant · 25 mi away

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Howard, City Of

Howard, City Of · 29 mi away

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Hitchcock, Town Of

Hitchcock · 34 mi away

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Arlington, City Of

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Wessington Springs, City Of

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Madison-Treatment Plant

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Iroquois, City Of: 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 August 14, 2026.

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

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