Santan Valley Area Drainage Master Plan
Summary
Pinal County is finalizing a comprehensive drainage study for San Tan Valley to map flood zones, identify vulnerable homes, and plan multimillion-dollar infrastructure projects like retention basins and channels. Because the area has grown through piecemeal development, stormwater management is disjointed, leaving many neighborhoods susceptible to heavy runoff.
At a glance
- Total mentions
- 5
- Last 30 days
- 2
Rising — discussed at 3 meetings since Sep 16, 2026, up from 1 in the two months before.
Impact analysis
Multi-million dollar price tags are expected for future capital improvement projects, which will be funded through existing taxing districts, grants, and developer contributions.
San Tan Valley residents and property owners will benefit from reduced flood risks, better-defined flood hazard regulations, and coordinated infrastructure improvements.
Developers and state land agencies may face increased costs and stricter infrastructure requirements as a condition of future development.
Mentions & discussions (5)
Flood Control District — November 4, 2026
The county now has an adopted drainage master plan for the San Tan Valley area, spanning four supervisor districts. It guides how stormwater and flood risks will be managed as the area grows. Adoption came days after heavy rains nearly forced an evacuation in Queen Valley.
Flood Control District — October 14, 2026
The county is applying for nearly $1 million in federal funding to study and plan flood prevention for the Smith Wash Watershed in districts 1 and 3.
Flood Control District — September 16, 2026
The district approved updating a local floodplain designation from Zone A to Zone AE near Interstate 8 and Midway Road, helping ensure accurate flood insurance and building standards.
Flood Control District Work Session Meeting (Work) — September 9, 2026
Pinal County is finalizing a comprehensive drainage study for San Tan Valley to map flood zones, identify vulnerable homes, and plan multimillion-dollar infrastructure projects like retention basins and channels. Because the area has grown through piecemeal development, stormwater management is disjointed, leaving many neighborhoods susceptible to heavy runoff.
Flood Control District — January 7, 2026
Grant timelines are being pushed out to give the district more time to build new box culverts and raise the roadway across the Lower Magma Channel.
Related development
LOMR for Zone A Floodplain near Interstate 8 and Midway Rd
Refines floodplain boundaries to provide accurate flood risk data for property owners.
San Tan Valley Area Drainage Master Plan (FL26-003)
Establishes a baseline for future drainage requirements in developing areas and guides county capital improvement projects.
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