How much wastewater does Portsmouth City Of STP treat?

Portsmouth City Of STP is permitted for a design flow of 0.02 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Portsmouth City Of STP use?

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

What is the NPDES permit for Portsmouth City Of STP?

The facility discharges under NPDES permit IA0072443, currently effective, expiring February 2030.

Is Portsmouth City Of STP in compliance?

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

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

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

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Portsmouth City Of STP

Portsmouth, IA 51565 · Shelby County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.02 MGD

NPDES permit: IA0072443; Effective

Permit expires: February 2030

Population served: 182; CWNS 2022

Portsmouth City Of STP is a publicly owned wastewater treatment works in Portsmouth, Shelby County, Iowa, serving about 182 residents. It discharges under NPDES permit IA0072443 (effective), which expires in February 2030, with 0 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

See the full treatment train at Portsmouth 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 Portsmouth 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 Portsmouth City Of STP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Iowa

Persia STP (regional Water Inc.)

Persia · 6 mi away

—

Shelby City Of STP

Shelby · 9 mi away

—

Earling City Of STP

Earling · 10 mi away

0.04 MGD

Harlan City Of STP

Harlan · 11 mi away

0.62 MGD

Woodbine WWTP

Woodbine · 11 mi away

0.13 MGD

Minden City Of STP

Minden · 12 mi away

0.05 MGD

Logan WWTP

Logan · 13 mi away

0.08 MGD

Neola WWTP

Neola · 14 mi away

0.09 MGD

Portsmouth 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 1, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms

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