Well Drillers in Pima County, AZ

Well Drillers in Pima County, Arizona

Pima County has 10 licensed well drilling contractors, all concentrated in the Tucson area. Most serve both the Tucson basin proper and the surrounding rural sub-basins: the Avra Valley to the west, the Altar Valley to the south, and the communities stretching southeast toward Cochise County (Benson, Vail, and Rincon Valley).

Well Drilling in the Tucson Basin

Drilling a residential well in Pima County means operating within the Tucson Active Management Area (Tucson AMA). Key regulatory requirements:

A Notice of Intent to Drill must be filed with ADWR before any new well
New subdivisions requiring groundwater must demonstrate 100-year adequacy
Large groundwater users (100+ acre-feet per year) require a Service Area Provider agreement or a Type 2 Non-Irrigation Right

Geologically, the Tucson basin is a straightforward alluvial basin — sand and gravel fills to 300–500 feet before transitioning to older, more consolidated sediments. Most residential wells are completed in the 200–600 foot range, though some outlying areas require deeper holes.

Benson area (southeast Pima/Cochise boundary): More variable geology with some volcanic intrusions; well depths and yields are less predictable.

Avra Valley: Shallower wells in many areas (150–300 feet) due to thick alluvial fill; Tucson Water has significant recharge operations here that add artificial recharge to the local aquifer.

Water Quality Considerations in Pima County

TCE contamination from the Tucson International Airport Area Superfund site affects groundwater in southeastern Tucson. Any well near this area (roughly south of I-10 and west of Swan Road) should be tested before use.
PFAS from Davis-Monthan AFB: ADEQ monitors a plume in the southeast Tucson area.
Hardness: 200–400 mg/L across most of the county; water softeners are common.
Arsenic: Low to moderate; test all new wells.
TDS: Generally 400–900 mg/L; acceptable for most uses but RO is popular for drinking water.

Licensed Well Drillers in Pima County

Tucson

BJ Drilling Company Inc — (520) 586-3282 — bjdrilling.com — Long-established drilling firm with operations across southern Arizona
Western Water Wells LLC — (520) 308-4047 — westernwells.com
Farwest Pump Company — (520) 293-9778 — farwestwell.com
Geomechanics Southwest Inc — (520) 889-7787 — gsidrilling.com — Specialty drilling including environmental and geotechnical work
Reliant Well Drilling and Pump Corp — (520) 293-9778 — reliantpump.services
Altar Drilling Inc — (520) 882-0384
Mike’s Drilling, LLC — (520) 399-2781 — mikesdrillingaz.com
Ironwood Well Service — (520) 261-4516 — ironwoodwell.com
Crane Machine & Pump Service, Inc. — (520) 792-0792