Pinal County, AZ Environmental Rules: Erosion Control (2026)

Anyone disturbing an acre or more of land in the county's urbanized unincorporated area, or a smaller parcel that is part of a larger development plan, must get both an ADEQ construction permit (a notice of intent under the state's general permit) and a separate stormwater approval from the county's Community Development or Public Works department under Section 20-66. No disturbance is allowed until that county approval issues, and a copy of the approval plus the site's stormwater pollution prevention plan (SWPPP) must stay on site during all work hours.

The application requires a pre-construction and construction phase stormwater site plan submitted at least 30 working days before construction starts. That plan has to spell out the BMPs the owner and everyone working the site will follow so that erosion is minimized and sediment transport is managed, along with controls for other construction wastes; the department reviews the plan and returns comments or a letter of acceptance, and any revisions must be resubmitted before work begins. During construction the department can inspect the site under Section 20-70 to confirm the SWPPP is being followed and that BMPs are properly installed and maintained.

Section 20-67 exempts routine maintenance within an existing facility's original line, grade or capacity, sites with no reasonable probability stormwater will leave the property, sites qualifying for a low-risk erosivity waiver, sites already under an individual NPDES permit, emergency work, and land outside the urbanized unincorporated area defined in Section 20-9. Fees for review and enforcement are set by a separate board of supervisors resolution under Section 20-234.