Tri-County Drilling Inc, located in San Diego, California, specializes in comprehensive geothermal ground loop drilling and installation services across the tri-county region. With extensive expertise in geotechnical soil testing and environmental drilling, the company employs advanced drilling methodologies including hollow stem auger, mud rotary wash, air rotary, wireline rock coring, and down-the-hole hammer techniques to prepare optimal ground conditions for geothermal systems. Beyond geothermal loop installation, Tri-County Drilling provides water well drilling, repair, and maintenance services, leveraging a modern fleet of all-terrain drill rigs including truck-mounted Diedrich equipment. The company's multi-disciplinary approach ensures precise bore hole placement and accurate soil analysis critical for efficient geothermal heat pump performance. Serving San Diego and surrounding areas, Tri-County Drilling combines decades of drilling expertise with specialized geothermal installation knowledge. Homeowners and commercial property owners can reach the team at 858-271-0099 or visit their website for detailed information about geothermal ground loop projects and related drilling services.
Company background: Tri-County Drilling, Inc. is a Southern California specialty drilling contractor founded in 1987 (39 years) by CEO/founder Sheryl Peterson. WBE, DBE, SBE certified (Woman-Owned + Disadvantaged Business Enterprise). They drill closed-loop geothermal boreholes up to 380 ft using vertical hollow-stem auger, mud-rotary, and air-percussion methods across San Diego, Riverside, San Bernardino, Chino, and Escondido. Licensed: CSLB C-57 #547737. Note: this is a specialty drilling subcontractor only — they do NOT sell, install, or service WaterFurnace or any other heat pump equipment.
Tri-County Drilling specializes in geothermal ground loop drilling across the tri-county San Diego region using advanced techniques including hollow stem auger, mud rotary wash, and down-the-hole hammer methods with truck-mounted Diedrich equipment.
