What is the address of Harper, City Of STP?

The address on the plant’s EPA facility record is 28871 210th Street, Harper, IA 52231, in Keokuk County. Its coordinates are 41.3533, -92.0461. For some plants the record holds the utility’s mailing address rather than the plant gate.

What treatment technology does Harper, City Of STP use?

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

What is the NPDES permit for Harper, City Of STP?

The facility discharges under NPDES permit IA0079359, currently effective, expiring February 2031.

Is Harper, City Of STP in compliance?

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

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

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

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Harper, City Of STP

28871 210th Street, Harper, IA 52231 · Keokuk County · Publicly Owned Treatment Works

Average flow: —

Design flow: —

NPDES permit: IA0079359; Effective

Permit expires: February 2031

Population served: 118; CWNS 2022

Harper, City Of STP is a publicly owned wastewater treatment works in Harper, Keokuk County, Iowa, serving about 118 residents. It discharges under NPDES permit IA0079359 (effective), which expires in February 2031, with 0 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

See the full treatment train at Harper, 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

Decision-makers at Harper, City Of STP.

No verified contacts on file yet

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Harper, 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 · Centrate · Ozonation · all terms

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