Arizona Extension & Soil Testing Directory
Find your local Arizona County Cooperative Extension office, official state university soil analysis lab, and Master Gardener volunteer plant clinics.
🔬 State Soil Testing Laboratory
Official Lab: UA Certified Environmental Soil Laboratory Partner
Standard Fee: $25 desert salinity & pH sample kit
Turnaround Time: 7 to 10 business days
State residents can obtain soil sample bags and submittal forms at any local county extension branch.
🌱 State Growing Conditions
Soil Types: Alkaline Sonoran Desert Caliche & Clay (pH 7.8 - 8.5)
Hardiness Zones: Zone 9b / 10a
Popular Crops: Citrus, dates, figs, peppers, desert legumes, bermudagrass
Do not add lime to Arizona desert soils. Incorporate sulfur and compost to flush out excessive salts.
Featured County Directories in Arizona (1 Listing)
Maricopa County
Extension Office: University of Arizona Cooperative Extension - Maricopa County
Soil Lab Fee: $25 desert salinity & pH sample kit
Phone: (602) 827-8200
Looking for Another County in Arizona?
Every county in Arizona is supported by the state Land-Grant University Extension system. If your specific county directory is currently being indexed, you can submit your soil samples directly to UA Certified Environmental Soil Laboratory Partner or contact our editorial desk for direct local office hours.
Request Local Extension Info for Your CountyFrequently Asked Questions: Arizona Soil & Extension
How do I get my soil tested in Arizona?
To test your soil in Arizona, collect 10 to 12 soil cores from a depth of 4 to 6 inches across your garden or field, air-dry the sample indoors, fill out your county extension submission form, and submit it to UA Certified Environmental Soil Laboratory Partner or your local county extension office.
How much does soil testing cost in Arizona?
Routine soil fertility analysis in Arizona typically costs $25 desert salinity & pH sample kit. Turnaround time for results is usually 7 to 10 business days.
Does every county in Arizona have a Cooperative Extension Office?
Yes. Every county in Arizona is served by the state's Land-Grant University Extension system. While our directory highlights primary regional office hubs and university labs, local extension agents serve horticulturists, farmers, and home gardeners across all counties in Arizona.
Written & Verified by Sahajul
Verified Author & Founder
Sahajul is an independent agricultural data researcher based in India and founder of LocalSoilLab.com. He specializes in compiling, structuring, and verifying US land-grant university extension services, soil lab testing fee schedules, and county Master Gardener contact directories directly from official .edu and USDA NIFA portals.