Tolleson WWTP
9555 W Van Buren St, Tolleson, AZ 85353 · Maricopa County · Publicly Owned Treatment Works
- Average flow
- 2.1 MGD
- Design flow
- 17.5 MGD
- NPDES permit
- AZ0020338
- Effective
- Permit expires
- February 2031
- Population served
- 7,332
- CWNS 2022
Tolleson WWTP is a publicly owned wastewater treatment works in Tolleson, Maricopa County, Arizona treating an average of 2.1 million gallons per day against a permitted design capacity of 17.5 MGD, serving about 7,332 residents. It discharges under NPDES permit AZ0020338 (effective), which expires in February 2031, with 28 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in August 2010.
Treatment technology
3 treatment structures and unit processes identified at Tolleson WWTP.
Available with a free Klarifi account
See the full treatment train at Tolleson WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 28
- Effluent violations
- 19
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Tolleson WWTP in EPA's ICIS system.
- Formal actions
- 2
- 0 since FY2020
- Penalties assessed
- $2,000
- all cases
- EPA inspections
- 1
- latest Oct 2003
Latest case · Aug 2010
Tolleson Wastewater Treatment Plant CAA 112R ESA
Administrative order · CAA, Prevention of Accidental Release/Risk Management Plans (RMPs) · Final Order With Penalty · Penalty $2,000
EPA's description of the case:
“This is an Admnistrative Penalty Action (Expedited Settlement Agreement), pursuant to CAA 112(r)(7), issued to Tolleson Wastewater Treatment Plant in Tolleson, Arizona. The violation involves failure…”
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Source: EPA ECHO, civil enforcement case 09-2010-3538.
Full case history with a free Klarifi account
Every action against Tolleson WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
2 verified contacts for Tolleson WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Tolleson WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Arizona
Tolleson · 3 mi away
83.69 MGD
Goodyear · 8 mi away
2.9 MGD
Phoenix · 9 mi away
35.19 MGD
Phoenix · 11 mi away
0.24 MGD
Goodyear · 12 mi away
—
Goodyear · 14 mi away
0.11 MGD
Buckeye · 15 mi away
2.13 MGD
Buckeye · 19 mi away
0.22 MGD
Tolleson 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 April 23, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms