What is the address of Grafton City Of STP?

The address on the plant’s EPA facility record is Approx. 0.14 Miles South Of 390th St. And 1st Ave., Grafton, IA 50440, in Worth County. Its coordinates are 43.3215, -93.0748. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Grafton City Of STP treat?

Grafton City Of STP is permitted for a design flow of 0.04 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Grafton City Of STP use?

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

What is the NPDES permit for Grafton City Of STP?

The facility discharges under NPDES permit IA0062529, currently effective, expiring March 2028.

Is Grafton City Of STP in compliance?

Discharge monitoring reports show no violations at Grafton City Of STP in the last three years.

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

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

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Grafton City Of STP

Approx. 0.14 Miles South Of 390th St. And 1st Ave., Grafton, IA 50440 · Worth County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.04 MGD

NPDES permit: IA0062529; Effective

Permit expires: March 2028

Population served: 216; CWNS 2022

Grafton City Of STP is a publicly owned wastewater treatment works in Grafton, Worth County, Iowa, serving about 216 residents. It discharges under NPDES permit IA0062529 (effective), which expires in March 2028, with 0 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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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 Grafton City Of STP, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Grafton City Of STP, plus the full compliance history and discharge data.

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Northwood City Of STP

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Mitchell County WW Pretreatment Plant

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Osage City Of STP

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Grafton 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 March 28, 2025.

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

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