How much wastewater does Williston City Of treat?

Williston City Of treats an average of 2.88 MGD and is permitted for a design flow of 6 MGD.

What treatment technology does Williston City Of use?

Klarifi has identified uncovered lagoons, biological n removal, biological p removal, biosolids aerobic digestion, biosolids mechanical dewatering, disinfection, uv, primary clarification or sedimentation, screening, suspended growth, aerobic at the Williston facility.

What is the NPDES permit for Williston City Of?

The facility discharges under NPDES permit ND0022349, currently effective, expiring March 2028.

Is Williston City Of in compliance?

Discharge monitoring reports show 4 violations at Williston City Of in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Williston City Of and how do I contact them?

Williston City Of is a publicly owned treatment works in Williston, North Dakota. Klarifi lists 16 verified decision-maker contacts for this facility, available with a free trial.

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Williston City Of

Williston, ND · Williams County · Publicly Owned Treatment Works

Average flow: 2.88 MGD

Design flow: 6 MGD

NPDES permit: ND0022349; Effective

Permit expires: March 2028

Population served: 16,988; CWNS 2022

Williston City Of is a publicly owned wastewater treatment plant in Williston, Williams County, North Dakota treating an average of 2.88 million gallons per day against a permitted design capacity of 6 MGD, serving about 16,988 residents. Treatment on site includes uncovered lagoons, biological n removal, biological p removal, biosolids aerobic digestion, biosolids mechanical dewatering and other unit processes. It discharges under NPDES permit ND0022349 (effective), which expires in March 2028, with 4 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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Biological N removal

unit process

Biological P removal

unit process

Biosolids Aerobic Digestion

unit process

Biosolids Mechanical Dewatering

unit process

Disinfection, UV

unit process

Primary Clarification or Sedimentation

unit process

Screening

unit process

Suspended Growth, Aerobic

unit process

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Compliance snapshot (last 3 years)

Total violations: 4

Effluent violations: 1

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

Key contacts

16 verified contacts for Williston City Of, with validated emails and direct phone numbers.

Unlock 16 verified contacts (13 more than shown)

Names, validated emails and direct phone numbers for decision-makers at Williston City Of, plus the full compliance history and discharge data.

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Williston 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 September 11, 2026; facility record last updated April 24, 2025.

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