How much wastewater does Calion WWTP treat?

Calion WWTP treats an average of 0.04 MGD and is permitted for a design flow of 0.11 MGD.

What treatment technology does Calion WWTP use?

Klarifi has identified uncovered lagoons at the Calion facility.

What is the NPDES permit for Calion WWTP?

The facility discharges under NPDES permit AR0038211, currently effective, expiring May 2028.

Is Calion WWTP in compliance?

Discharge monitoring reports show 19 violations at Calion WWTP in the last three years. The full history is available in Klarifi.

Who operates Calion WWTP and how do I contact them?

Calion WWTP is a publicly owned treatment works in Calion, Arkansas. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Calion WWTP

Calion, AR · Union County · Publicly Owned Treatment Works

Average flow: 0.04 MGD

Design flow: 0.11 MGD

NPDES permit: AR0038211; Effective

Permit expires: May 2028

Population served: 433; CWNS 2022

Calion WWTP is a publicly owned wastewater treatment works in Calion, Union County, Arkansas treating an average of 0.04 million gallons per day against a permitted design capacity of 0.11 MGD, serving about 433 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit AR0038211 (effective), which expires in May 2028, with 19 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Uncovered lagoons

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Compliance snapshot (last 3 years)

Total violations: 19

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 Calion WWTP.

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Nearby wastewater treatment plants in Arkansas

Norphlet WWTP

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0.02 MGD

Smackover WWTP

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Harrell WWTP

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Oak Manor Water Association

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Strong WWTP

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Hermitage WWTP

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Calion WWTP: 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 September 11, 2026; facility record last updated July 25, 2026.

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