Real Plumbing Jobs in Corona, CA — What We Found and What We Fixed

The Call

A homeowner in Eagle Glen called in late September after receiving a City of Corona water bill that was $312 higher than the same month the prior year. The home was built in 1981. They had lived there for fourteen years. No visible water anywhere in the house, no running toilets, no dripping faucets. No warm floor spots that they had noticed. They were certain it was a billing error and called us only after the city confirmed the bill was accurate.

What We Found

The two-minute water meter test confirmed active water movement with every fixture and appliance in the house turned off. The meter triangle dial moved within thirty seconds — a clear active leak somewhere in the pressurized supply system.

We ran an acoustic scan of the slab using electronic listening equipment. On a 1981 home in Eagle Glen, the under-slab copper hot water supply lines are standard construction — copper embedded in or directly beneath the concrete slab. After 41 years of Corona's hard water creating an electrochemical reaction inside the pipe wall, pinhole formation is expected rather than surprising in this age bracket.

The acoustic equipment identified a distinct pressurized-leak signature beneath the hallway floor between the master bedroom and the second bathroom — approximately 11 feet from the exterior wall. Thermal imaging confirmed a warm patch on the concrete slab surface consistent with a hot water supply leak at that location, with the heat signature spreading about 18 inches in diameter, suggesting the leak had been running for several weeks.

Critically, the thermal camera also showed early moisture saturation beginning at the base of the adjacent wall where the hallway meets the master bedroom. The drywall showed no visible moisture from the outside — but the thermal signature indicated the water had begun wicking into the wall cavity. Had this continued another three to four weeks, drywall removal and mold testing would have become part of the repair scope.

"He showed me the thermal image on the camera screen and I could see the heat bloom right there under my hallway. I had no idea there was a leak. I genuinely thought it was a billing error."

Why Not a Spot Repair

The acoustic scan identified one active pinhole. But the copper pipe at that location was 41 years old in a 15.8 to 18 GPG water environment. We performed a visual assessment of the accessible copper at the water heater connections and at the hose bib fitting in the garage — both showed significant external mineral staining, which correlates with internal wall pitting at the same degree of progression.

In our experience with Eagle Glen homes of this age and water profile, adjacent sections of the same under-slab copper line typically show similar wall thickness loss to the section that failed first. A spot repair at the one confirmed pinhole would address the confirmed leak. It would not address the two or three adjacent weak points that statistical probability suggested were within weeks of their own failure.

We presented both options with the full cost and trade-off explanation: spot repair at approximately $900 to $1,200, with a realistic expectation of another slab leak call within six to eighteen months on the same line — or an overhead PEX reroute at $2,200 that abandons the failing under-slab copper entirely and runs new cross-linked polyethylene pipe through the attic, bypassing the slab permanently. PEX does not react with Corona's mineral content. There is no internal pitting mechanism. The new line carries a design life that exceeds the remaining lifespan of the house.

The homeowner chose the overhead reroute.

What We Did

• Acoustic detection identified the leak location without opening the floor or cutting concrete
• Thermal imaging confirmed the leak location and revealed early wall cavity moisture that spot probing would have missed
• Routed new PEX hot water supply line from the water heater through the attic and down inside the wall to serve the affected bathrooms and fixtures — no tile broken, no concrete cut
• Completed in one day. Permit filed with the City of Corona. Inspection passed
• Provided cause-of-loss documentation for homeowner insurance submission covering the water damage to the adjacent wall cavity

The Outcome

The following month's water bill returned to normal. No tile was broken. No concrete was cut. The wall moisture was caught early enough that mold testing came back clean — the thermal imaging caught it at the saturation stage before mold had established. The homeowner filed an insurance claim for the wall cavity moisture remediation, which was covered under their HO-3 policy as sudden and accidental water damage. Our cause-of-loss documentation supported the claim.

Fourteen months later, the homeowner called to report the new PEX line had performed without any issue and their water bills had normalized completely.