What is the address of Diagonal City Of STP?

The address on the plant’s EPA facility record is 0.4 Mile West Of South & 2nd Street, Diagonal, IA 50845, in Ringgold County. Its coordinates are 40.8065, -94.3539. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Diagonal City Of STP treat?

Diagonal City Of STP is permitted for a design flow of 0.06 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Diagonal City Of STP use?

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

What is the NPDES permit for Diagonal City Of STP?

The facility discharges under NPDES permit IA0063401, currently effective, expiring May 2029.

Is Diagonal City Of STP in compliance?

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

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

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

Try for free Log in

Diagonal City Of STP

0.4 Mile West Of South & 2nd Street, Diagonal, IA 50845 · Ringgold County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.06 MGD

NPDES permit: IA0063401; Effective

Permit expires: May 2029

Population served: 344; CWNS 2022

Diagonal City Of STP is a publicly owned wastewater treatment works in Diagonal, Ringgold County, Iowa, serving about 344 residents. It discharges under NPDES permit IA0063401 (effective), which expires in May 2029, with 0 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

Create a free account

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 Diagonal City Of STP.

No verified contacts on file yet

Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.

Try Klarifi free

Nearby wastewater treatment plants in Iowa

Southwest Ringgold County WWTF - Sirwa

Redding · 9 mi away

—

Arispe City Of STP

Arispe · 12 mi away

—

Lenox City Of STP

Lenox · 12 mi away

0.2 MGD

Sun Valley Sanitary District Lagoon

Ellston · 15 mi away

—

Sharpsburg,city-STP-(sirwa)

Sharpsburg · 16 mi away

—

Afton City Of STP

Afton · 17 mi away

0.1 MGD

Creston City Of STP

Creston · 17 mi away

1.25 MGD

Blockton City Of (southern Ia Rural Water Assn.)

Blockton · 17 mi away

—

Diagonal 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 April 23, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free