What is the address of Griswold WWTP?

The address on the plant’s EPA facility record is 69321 540th St, Griswold, IA 51535, in Cass County. Its coordinates are 41.2251, -95.1536. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Griswold WWTP treat?

Griswold WWTP treats an average of 0.09 MGD.

What treatment technology does Griswold WWTP use?

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

What is the NPDES permit for Griswold WWTP?

The facility discharges under NPDES permit IA0031411, currently effective, expiring March 2027.

Is Griswold WWTP in compliance?

Discharge monitoring reports show 4 violations at Griswold WWTP in the last three years, 4 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Griswold WWTP and how do I contact them?

Griswold WWTP is a publicly owned treatment works in Griswold, Iowa. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Griswold WWTP

69321 540th St, Griswold, IA 51535 · Cass County · Publicly Owned Treatment Works

Average flow: 0.09 MGD

Design flow: —

NPDES permit: IA0031411; Effective

Permit expires: March 2027

Population served: 994; CWNS 2022

Griswold WWTP is a publicly owned wastewater treatment works in Griswold, Cass County, Iowa treating an average of 0.09 million gallons per day, serving about 994 residents. It discharges under NPDES permit IA0031411 (effective), which expires in March 2027, with 4 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Griswold WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 4

Effluent violations: 4

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

Key contacts

Decision-makers at Griswold WWTP.

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Nearby wastewater treatment plants in Iowa

Elliott City Of STP

Elliott · 4 mi away

—

Carson City Of STP

Carson · 14 mi away

0.07 MGD

Atlantic City Of STP

Atlantic · 14 mi away

0.69 MGD

Oakland City Of STP

Oakland · 14 mi away

0.08 MGD

Cumberland WWTP

Cumberland · 14 mi away

—

Macedonia City Of STP

Macedonia · 15 mi away

—

Henderson City Of STP

Henderson · 16 mi away

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Red Oak City Of STP

Red Oak · 16 mi away

0.96 MGD

Griswold 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 March 7, 2025.

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

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