Chemical processing, handling, or storage in Maricopa County generally needs a county air permit (Non-Title V or Title V) once emissions reach the Permitting Handbook's Table 1 thresholds (0.3–1.0 tons/year by pollutant; single HAP 0.5–5.0); dust control (Rule 310) runs through the separate Dust and Miscellaneous Portal. Outside Maricopa, Pima County (PDEQ), Pinal County, and ADEQ (elsewhere) issue air permits.
az-regulatory §Maricopa County air-quality permit
- When it applies
- Arizona sites with air-emission sources (Maricopa, Pima, Pinal counties or ADEQ elsewhere).
- Evidence you'd show
- Permit
- How often
- Whenever something changes
- If it isn't met
- Operating without a permit.
az-regulatory v1 §Maricopa County air-quality permit — verify against the source
Verified against source on 2026-09-07 · Source version: 2026 calendar
Verify against the source — requirements change.
https://ready.maricopa.gov/DocumentCenter/View/64549/Permitting-Handbook-PDF