What is the address of Letts City Of STP?

The address on the plant’s EPA facility record is Linn & Main St, Letts, IA 52754, in Louisa County. Its coordinates are 41.3259, -91.2449. For some plants the record holds the utility’s mailing address rather than the plant gate.

What treatment technology does Letts City Of STP use?

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

What is the NPDES permit for Letts City Of STP?

The facility discharges under NPDES permit IA0061492, currently administratively continued, expiring April 2016.

Is Letts City Of STP in compliance?

Discharge monitoring reports show 11 violations at Letts City Of STP in the last three years, 11 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Letts City Of STP

Linn & Main St, Letts, IA 52754 · Louisa County · Publicly Owned Treatment Works

Average flow: —

Design flow: —

NPDES permit: IA0061492; Administratively continued

Permit expires: April 2016

Population served: 363; CWNS 2022

Letts City Of STP is a publicly owned wastewater treatment works in Letts, Louisa County, Iowa, serving about 363 residents. It discharges under NPDES permit IA0061492 (administratively continued), which expires in April 2016, with 11 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 11

Effluent violations: 11

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

Key contacts

1 verified contact for Letts City Of STP, with validated emails and direct phone numbers.

Unlock 1 verified contact

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

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Letts 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 · Anaerobic digester · Lift station · all terms

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