Arizona NPDES permit search
Status, expiry and violations for 55 municipal wastewater permits · issued by ADEQ as AZPDES permits
In short
How do I look up an NPDES permit in Arizona?
Search this page by permit number or plant name for a municipal plant’s permit status, expiry date and violations. For the official file, search ADEQ’s MegaSearch. EPA’s ECHO database shows the monitoring results and violations of every permit. The 210 industrial permits in Arizona are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
50
Administratively continued
4
Expired
0
Plants with effluent violations, 3 years
32
Where to find official Arizona NPDES records
Arizona Department of Environmental Quality (ADEQ) runs the NPDES program in Arizona under authorization from EPA Region 9, as the Arizona Pollutant Discharge Elimination System (AZPDES). It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. EPA Region 9 issues the permits on tribal lands, including the Navajo Nation. ADEQ website ↗
permit documents
ADEQ’s records search: find the facility’s records there and request them; ADEQ says some digital records are not viewable online.
permits · DMRs · inspections · violations · enforcement
EPA’s Enforcement and Compliance History Online. Search water facilities by permit number, name or city; the Detailed Facility Report lists inspections, violations and enforcement actions, and Effluent Charts plot monitoring results against the permit limits.
- Discharge monitoring reports
- Through myDEQ, ADEQ’s own online portal.
Industrial and commercial NPDES permits in Arizona
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 210 individual permits in force for industrial and commercial facilities in Arizona (manufacturers, food processors, mines, power plants, landfills), 52 of them major dischargers, plus 555 facilities covered by a general permit, mostly for stormwater. 24 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 210 industrial permits in Arizona
Search every industrial and commercial discharger in Arizona by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Arizona: permits in force (effective or administratively continued) held by facilities EPA does not class as publicly owned treatment works or federal facilities. Source: EPA ICIS-NPDES via Klarifi, October 2026.
Violations at Arizona wastewater plants
32 of the 55 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 32 had a violation of any kind, including late or missing monitoring reports. Each plant’s page shows its own count. EPA’s enforcement records list 31 formal cases naming Arizona wastewater plants, 4 of them since fiscal year 2020, with $927,000 in penalties assessed. Enforcement cases in Arizona →
Permit renewals by year
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
Largest permit holders in Arizona
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| 91st Avenue WWTP | Tolleson | 83.69 | 230 | AZ0020524 | Effective | Apr 2028 | 2 |
| 23rd Avenue Wastewater Treatment Plant | Phoenix | 35.19 | 63 | AZ0020559 | Effective | Jun 2029 | 2 |
| Pima County - Ina Road WWTP | Tucson | 29.75 | 50 | AZ0020001 | Effective | May 2027 | 3 |
| Agua Nueva WRF | Tucson | — | 35.2 | AZ0026107 | Effective | Apr 2028 | 0 |
| City Of Mesa - Greenfield Water Reclamation Plant | Gilbert | 1.08 | 30 | AZ0025241 | Effective | Sep 2029 | 0 |
| Northwest Water Reclamation Plant | Mesa | 3.08 | 18 | AZ0024627 | Administratively continued | Jun 2024 | 0 |
| Northwest Wrp | Mesa | 1.33 | 18 | AZ0024031 | Effective | Nov 2029 | 6 |
| Tolleson WWTP | Tolleson | 2.1 | 17.5 | AZ0020338 | Effective | Feb 2031 | 28 |
| Casa Grande WRF | Casa Grande | — | 14 | AZ0025178 | Effective | Sep 2029 | 28 |
| Tucson Airport Remediation Project - Co-Mingled Plume | Tucson | 1.15 | 10.2 | AZ0026417 | Effective | Oct 2026 | 0 |
Arizona NPDES permits: questions
NPDES permit search in other states
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 12, 2026.
Wastewater terms: NPDES permit · POTW · Significant industrial user · MGD · Lift station · Inflow and infiltration · all terms