Casa Grande, AZ Environmental Rules: Erosion Control (2026)

Casa Grande Municipal Code Chapter 18.12, Construction Stormwater Management, requires a site development permit before land-disturbing activity uncovering one or more acres, or disturbing less than one acre as part of a common plan of development, proceeds without an approved Stormwater Pollution Prevention Plan (SWPPP) (§ 18.12.020(A)). Applications must name the owner, developer, and any consulting firm, and include a filing fee (§ 18.12.020(B)); the Public Works Director has thirty days to approve, conditionally approve, or disapprove the application (§ 18.12.030). The erosion and sediment control plan required under § 18.12.040 must sequence construction activity (stripping, rough grading, utility work, final grading and landscaping) and identify the erosion and sediment control measures used throughout each phase.

Design requirements under § 18.12.050 tie grading and sediment control practices to the MCFCD Drainage Policies and Standards and require phasing on any site disturbing more than thirty acres. Specific erosion control measures include completing soil stabilization within five days of clearing or inactivity, establishing vegetative cover within two weeks or reseeding, stabilizing soil stockpiles at the end of each workday, and preventing sediment or dust from leaving the site (§ 18.12.050(D)). Sediment controls must include settling basins, sediment traps, or perimeter controls, plus vegetated buffer strips protecting adjacent properties (§ 18.12.050(E)).

The Public Works Director inspects at the start of construction, at installation of control measures, at final grading, at the close of the construction season, and at final landscaping, with two working days' notice required (§ 18.12.060).