Leak Detection in San Bernardino, CA

Signs water is escaping somewhere

• Monthly usage on your San Bernardino Municipal Water Department bill rising while your habits haven't changed
• The meter dial creeping forward when no one is using water
• A faint rushing or hissing sound inside a wall, often easiest to hear at night
• Warm spots on a tile or concrete floor, which can point to a hot water line leaking under the slab
• Stained drywall, lifting vinyl or a musty smell in a closet or cabinet
• A strip of lawn between the meter and the house that stays green or soft in dry weather

What makes San Bernardino leaks different

Much of the city's housing is decades old. In ZIP code 92404, for example, about 72 percent of houses were built in 1979 or earlier, according to city-data.com. Homes of that age can still have galvanized supply pipe that corrodes from the inside, or copper that has developed pinholes, and most sit on concrete slabs where a leak can run unseen for months.

The water itself plays a part. SBMWD's 2025 Consumer Confidence Report lists hardness averaging 242.2 mg/L as calcium carbonate, all from Bunker Hill Basin groundwater. Hard water leaves crusty white deposits at fittings and valves, and a slow drip that keeps evaporating often shows up as that crust before it shows up as a puddle.

Ownership is clear-cut here. SBMWD maintains the pipe from the main up to the meter; the customer is responsible for the underground service line from the meter to the building and everything after it. A wet spot in the yard between meter and foundation is usually a private repair.

What affects the cost

• How many zones of plumbing must be pressure-tested before the leak is isolated
• Whether the leak sits under a slab, in a wall, in the attic or underground in the yard
• Equipment needed, from acoustic listening devices to thermal imaging and tracer gas
• The repair itself, such as a spot repair, a reroute or a new service line, and whether the City of San Bernardino Building & Safety Division requires a permit

What happens when you call

The call connects you with an independent plumber who covers San Bernardino. Mention what you've noticed, where, and whether the meter moves with everything off. Having a recent bill nearby helps the plumber judge how much water is being lost and how urgent the visit is.