What is the address of Calera Pwa?

The address on the plant’s EPA facility record is 110 West Main Street, Calera, OK 74730, in Bryan County. Its coordinates are 33.9258, -96.4396. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Calera Pwa treat?

Calera Pwa treats an average of 0.3 MGD and is permitted for a design flow of 0.35 MGD.

What treatment technology does Calera Pwa use?

Klarifi has identified 2 treatment structures and unit processes at the Calera facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Calera Pwa?

The facility discharges under NPDES permit OK0031682, currently effective, expiring November 2030.

Is Calera Pwa in compliance?

Discharge monitoring reports show 25 violations at Calera Pwa in the last three years, 25 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Calera Pwa and how do I contact them?

Calera Pwa is a publicly owned treatment works in Calera, Oklahoma. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Calera Pwa

110 West Main Street, Calera, OK 74730 · Bryan County · Publicly Owned Treatment Works

Average flow: 0.3 MGD

Design flow: 0.35 MGD

NPDES permit: OK0031682; Effective

Permit expires: November 2030

Population served: 1,939; CWNS 2022

Calera Pwa is a publicly owned wastewater treatment plant in Calera, Bryan County, Oklahoma treating an average of 0.3 million gallons per day against a permitted design capacity of 0.35 MGD, serving about 1,939 residents. It discharges under NPDES permit OK0031682 (effective), which expires in November 2030, with 25 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Calera Pwa.

Available with a free Klarifi account

See the full treatment train at Calera Pwa: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 25

Effluent violations: 25

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

Key contacts

Decision-makers at Calera Pwa.

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Nearby wastewater treatment plants in Oklahoma

Durant City Utilities Auth

Durant · 3 mi away

1.52 MGD

Colbert Wwt

Colbert · 6 mi away

0.16 MGD

Kingston, Town Of

Kingston · 17 mi away

0.17 MGD

Bokchito, City Of

Bokchito · 18 mi away

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Madill Pwa

Madill · 23 mi away

0.46 MGD

Oakland Pwa

Oakland · 23 mi away

0.03 MGD

Tishomingo, City Of

Tishomingo · 25 mi away

0.17 MGD

Wapanucka Public Works Auth.

Wapanucka · 31 mi away

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Calera Pwa: 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 September 14, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms

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