Slab Leak Repair in San Pedro, CA

A slab leak is a pressurized hot or cold water line failing inside the concrete slab a house sits on. Two failure modes dominate: pinhole pitting on copper supply lines (the most common), and friction abrasion where a pipe crosses a rebar or moves against gravel inside the slab. Symptoms are warm spots on the floor, audible running water with all fixtures off, an unexplained jump on the water meter, or a sudden spike in the water bill. We locate the exact leak point with electronic line tracing and acoustic equipment, then choose between spot repair through a small slab cut or rerouting the line above the slab through walls and ceilings — whichever is cheaper and less invasive for that specific failure.

Slab leaks in San Pedro cluster heavily in homes built between 1900–1940 and 1940–1965. The reason: copper supply lines installed during that era weren't sleeved through the slab, so they're in direct contact with the concrete and any aggregate that moved with the pour. LADWP serves San Pedro as part of its Harbor Communities area with Metropolitan water. Its 2025 report lists Harbor-area hardness by plant, not as one figure: averages of 234 mg/L at Weymouth, 236 mg/L at Diemer and 140 mg/L at Jensen, or about 13.7, 13.8 and 8.2 grains per gallon by calculation adds a chemistry layer to the problem — copper pitting accelerates in water with certain mineral profiles, and San Pedro's supply has the right characteristics to drive it. Most slab leaks we see in San Pedro are second or third pinholes on the same line within a 2–3 year window, which is the moment to seriously consider rerouting instead of spot-repairing the next one.