SINKHOLES ARE
SYMPTOMS.
WE FIX THE DISEASE.
We don't patch holes. We perform forensic root-cause analysis, repair the failed utility, and permanently stabilize the subsurface.
deployed this month
We identify the real problem.
Then we fix it permanently.
Most contractors just fill the hole. We trace the failure back to the utility and eliminate the cause.
CMP Tank Failure
Joint separation, invert corrosion, and structural fatigue in corrugated metal pipe detention systems are the #1 cause of sinkholes in the Valley.
Sewer Main Migration
Leaking joints in gravity sewer lines create soil voids that migrate upward. We specialize in live sewer remediation under active roadways and driveways.
Storm System Breach
Cracked RCP, failed catch basins, and poor site grading during monsoon season create the perfect conditions for rapid sinkhole formation.
The 4-Phase Forensic Repair Process
Every repair is documented, photographed, and engineered to exceed MAG and ADOT standards.
Potholing, CCTV, GPR, and LiDAR mapping to locate the exact point of failure and void extent.
We excavate, repair or replace the compromised utility (even if we didn’t install it), and install structural backfill.
GPS-guided compaction, geogrid reinforcement, and engineered soil stabilization to restore structural integrity.
Final grading, pavement restoration, and drainage correction with 5-year workmanship warranty.
Potholing, CCTV, GPR & LiDAR to pinpoint exact failure location and void size.
Excavate, repair utility, install MAG-spec structural backfill.
GPS compaction, geogrid, and engineered fill to eliminate future movement.
Pavement, curb, and drainage restoration with 5-year warranty.
Recent Forensic Repairs
Trusted by the Valley’s most demanding clients
"PHC responded to our 3 a.m. sinkhole on a critical arterial. By 7 a.m. they had the road open and the utility permanently fixed. These are the people you want on speed dial."
"We’ve used PHC on 7 major sinkhole events over 4 years. They’re the only contractor who actually diagnoses the root cause instead of just filling the hole and walking away."
"After a competitor’s failed repair created an even larger sinkhole, PHC came in, performed a full forensic investigation, and gave us a permanent solution. Worth every penny."
Sinkhole questions, answered.
Report a
Sinkhole Today
Same-day assessments available for active sinkholes.
Report Received
Thank you. A PHC forensic engineer has been assigned to your case.