What is the address of Enid, City Of?

The address on the plant’s EPA facility record is 4400 East Market Street, Enid, OK 73701, in Garfield County. Its coordinates are 36.3869, -97.8154. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Enid, City Of treat?

Enid, City Of treats an average of 2.89 MGD and is permitted for a design flow of 12 MGD.

What treatment technology does Enid, City Of use?

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

What is the NPDES permit for Enid, City Of?

The facility discharges under NPDES permit OK0021628, currently effective, expiring July 2029.

Is Enid, City Of in compliance?

Discharge monitoring reports show 8 violations at Enid, City Of in the last three years, 8 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Enid, City Of and how do I contact them?

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

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Enid, City Of

4400 East Market Street, Enid, OK 73701 · Garfield County · Publicly Owned Treatment Works

Average flow: 2.89 MGD

Design flow: 12 MGD

NPDES permit: OK0021628; Effective

Permit expires: July 2029

Population served: 49,583; CWNS 2022

Enid, City Of is a publicly owned wastewater treatment plant in Enid, Garfield County, Oklahoma treating an average of 2.89 million gallons per day against a permitted design capacity of 12 MGD, serving about 49,583 residents. It discharges under NPDES permit OK0021628 (effective), which expires in July 2029, with 8 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Enid, City Of.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 8

Effluent violations: 8

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

Key contacts

Decision-makers at Enid, City Of.

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Nearby wastewater treatment plants in Oklahoma

North Enid, Town Of

North Enid · 4 mi away

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Garber, City Of

Garber · 14 mi away

0.04 MGD

Perry, City Of

Perry · 31 mi away

0.33 MGD

Tonkawa-Cl2 Booster Station

Tonkawa · 34 mi away

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Cherokee Former City Hall

Cherokee · 36 mi away

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Kingfisher

Kingfisher · 36 mi away

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Guthrie

Guthrie · 40 mi away

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Blackwell, City Of

Blackwell · 41 mi away

0.88 MGD

Enid, City Of: 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 14, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms

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