How much wastewater does Rio De Flag WWTP treat?

Rio De Flag WWTP is permitted for a design flow of 4 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Rio De Flag WWTP use?

Klarifi has identified disinfection, uv at the Flagstaff facility.

What is the NPDES permit for Rio De Flag WWTP?

The facility discharges under NPDES permit AZ0023639, currently effective, expiring April 2030.

Is Rio De Flag WWTP in compliance?

Discharge monitoring reports show 2 violations at Rio De Flag WWTP in the last three years, 2 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Rio De Flag WWTP and how do I contact them?

Rio De Flag WWTP is a publicly owned treatment works in Flagstaff, Arizona. Klarifi lists 5 verified decision-maker contacts for this facility, available with a free trial.

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Rio De Flag WWTP

Flagstaff, AZ · Coconino County · Publicly Owned Treatment Works

Average flow: —

Design flow: 4 MGD

NPDES permit: AZ0023639; Effective

Permit expires: April 2030

Population served: 26,185; CWNS 2022

Rio De Flag WWTP is a publicly owned wastewater treatment works in Flagstaff, Coconino County, Arizona, serving about 26,185 residents. Treatment on site includes disinfection, uv. It discharges under NPDES permit AZ0023639 (effective), which expires in April 2030, with 2 recorded violations in the last three years.

Treatment technology

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

Disinfection, UV

unit process

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Compliance snapshot (last 3 years)

Total violations: 2

Effluent violations: 2

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

Key contacts

5 verified contacts for Rio De Flag WWTP, with validated emails and direct phone numbers.

Unlock 5 verified contacts (2 more than shown)

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

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—

Rio De Flag 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 November 3, 2025.

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