What is the address of Post Oak WWTP?

The address on the plant’s EPA facility record is 1800 E. F.m. 1417, Sherman, TX 75090, in Grayson County. Its coordinates are 33.5998, -96.5765. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Post Oak WWTP treat?

Post Oak WWTP is permitted for a design flow of 16 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Post Oak WWTP use?

Klarifi has identified 4 treatment structures and unit processes at the Sherman facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Post Oak WWTP?

The facility discharges under NPDES permit TX0024325, currently administratively continued, expiring August 2025.

Is Post Oak WWTP in compliance?

Discharge monitoring reports show 1 violation at Post Oak WWTP in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Post Oak WWTP and how do I contact them?

Post Oak WWTP is a publicly owned treatment works in Sherman, Texas. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Post Oak WWTP

1800 E. F.m. 1417, Sherman, TX 75090 · Grayson County · Publicly Owned Treatment Works

Average flow: —

Design flow: 16 MGD

NPDES permit: TX0024325; Administratively continued

Permit expires: August 2025

Population served: 4,561; CWNS 2022

Post Oak WWTP is a publicly owned wastewater treatment works in Sherman, Grayson County, Texas, serving about 4,561 residents. It discharges under NPDES permit TX0024325 (administratively continued), which expires in August 2025, with 1 recorded violation in the last three years.

Treatment technology

4 treatment structures and unit processes identified at Post Oak WWTP.

Available with a free Klarifi account

See the full treatment train at Post Oak WWTP: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 1

Effluent violations: 1

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

Key contacts

2 verified contacts for Post Oak WWTP, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Post Oak WWTP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Texas

Tom Bean WWTP

Tom Bean · 8 mi away

0.44 MGD

City Of Bells WWTP

Bells · 9 mi away

0.36 MGD

North Texs Regional Airport WWTP

Denison · 10 mi away

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City Of Whitewright-Plant 2 - 407 S Gowdy

Whitewright · 12 mi away

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Savoy WWTP

Savoy · 12 mi away

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City Of Van Alstyne WWTP

Van Alstyne · 12 mi away

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Stanley Creek WWTP

Gunter · 13 mi away

0.15 MGD

Paw Paw WWTF

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4.1 MGD

Post Oak 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 October 26, 2026; facility record last updated August 7, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms

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