Map Layers
Fit to district
Fit to stations
NFPA 1710 NFPA / ADHS suburban ADHS rural Proposed New Stations
Legend
Benchmark Source Notes
NFPA 1710 — 240 sec (4 min) first-unit travel and 480 sec (8 min) full alarm assignment for career fire service.NFPA 1720 — rural staffing/assembly references used as a context point for unincorporated areas.Arizona R9-25-907 — the ADHS rule that establishes CON response-time, response-code, and tolerance frameworks; aligns with 90th-percentile urban / suburban / rural benchmarks under 2024 statutory updates.
Modeling Approach
Coverage zones are travel-time isochrones , not radial circles. They are shaped to reflect the local arterial network (Hunt Hwy, Gantzel, Ironwood, Combs, Bella Vista, Schnepf, Magma, Empire) and typical AM/PM peak congestion on Hunt Hwy and Gantzel. They are planning estimates, not measured performance.
Why These Three New Sites
The current three Rural Metro stations cluster along the Main St / Gantzel north-south corridor. Coverage shadows fall on the east, far north, and far south of the proposed district. The three proposed sites are placed so each one closes a major gap and reinforces overlap with an existing station for redundancy on concurrent calls:
Station A — North/NE quadrant (Combs & Felix area). Closes the NE shadow toward Empire/Felix; reinforces 842 along Combs.Station B — Southeast quadrant (Bella Vista & Felix area). Closes the SE shadow; reinforces 843 east-bound and 841 east-bound.Station C — Southwest quadrant (Hunt Hwy & Schnepf area). Closes the SW shadow along the southern district edge; reinforces 841 west-bound.
With these three additions, nearly the entire proposed district falls inside the 8-minute NFPA 1710 / ADHS suburban benchmark, and a substantial majority falls inside the 4-minute NFPA 1710 first-unit benchmark.
Travel time only — does not include 911 call-processing or turnout time, which add roughly 60–80 seconds before the clock on these zones starts. Actual performance depends on call volume, unit availability, weather, train crossings (UPRR), and incident type. This map is an educational planning tool for the proposed San Tan Valley Fire District and is not an official ADHS or Rural Metro coverage product.