Most house tours are visual. Buyers notice the new floors, the fresh paint and the updated kitchen, and those are exactly the surfaces a seller has spent money on. Plumbing reveals itself differently. It tends to show up as a sound behind a wall, a smell in a hallway, a rough spot on a faucet or a pipe that feels slightly warm when it shouldn’t. In a neighborhood where many homes were built just after World War II, a buyer who pays attention to all of those signals during a walkthrough will learn far more than a quick look at the sinks can show.
Even sharp senses only reach so far, and that is the point where bringing in a Pacoima plumber during your contingency window pays for itself. The crew at that link has handled pre-purchase inspections across the Valley and the rest of California since 2010, and they bring sewer cameras and leak detection equipment that let them see what a general inspector usually skips. Escrow timelines rarely wait, so it helps that they offer same-day visits for requests made before 1:30 PM, along with licensed and insured technicians and round-the-clock emergency coverage once the keys are yours. What follows is a way to tour a house with plumbing in mind before that visit, so you know which questions to ask.
Let Your Eyes Go Low
Buyers tend to look at eye level, but plumbing problems usually show up close to the floor. Open the cabinet under every sink and look at the back wall and the cabinet floor. Swollen particleboard, rings of dried water or a fresh square of contact paper laid over the base all suggest a leak, and the paper may have been put there to hide one.
If the house sits on a raised foundation, as many in Pacoima do, ask to look into the crawlspace or at least shine a flashlight through the access opening. Dull gray threaded pipe is galvanized steel, which was standard in the early 1950s and is likely near the end of its service life, even if the fixtures upstairs are new. Watch for places where shiny copper meets that gray pipe without a fitting between them. When those two metals touch directly they corrode at the joint, and it is a common sign of quick patch repairs over the decades. Darkened framing, damp soil or a white crust on cast iron drains tells you water has been escaping slowly, sometimes for years.
The garage deserves the same close attention. A water heater’s label usually shows its manufacture date, and tank heaters typically last about ten to twelve years. Rust around the bottom seam or water in the drain pan means the tank is close to failing. California requires every tank heater to be braced with seismic straps, and a heater with loose straps or no straps at all suggests the rest of the plumbing may not have been maintained much better.
Listen While the Water Runs
Ask the agent whether you can run water while you walk through the house. Turn on the kitchen tap and have someone flush a toilet in another room. If the kitchen flow drops sharply, the supply lines are probably narrowed with corrosion and mineral scale. San Fernando Valley water averages around eight to nine grains of hardness per gallon, and decades of that mineral load build up inside old pipes.
After the toilet refills, keep listening. A faint hiss or a short refill a few minutes later usually means a worn flapper. LADWP disinfects with chloramine, which tends to wear down rubber parts faster than plain chlorine, so this is common and inexpensive to fix. A loud knock when a faucet closes points to high water pressure, and Valley homes often see street pressure above the 80 psi limit that plumbing code generally allows for a house. Look near where the main line enters for a pressure regulator. If there isn’t one, budget for it.
Gurgling from a tub or shower drain while the washing machine empties is a more serious sound. It usually means the main sewer line is partly blocked, and that is the most expensive kind of plumbing repair this guide covers.
Trust Your Nose
A sewer smell near a floor drain or at the outdoor cleanout can point to a cracked lateral or a dried-out trap. A musty odor in a closet that shares a wall with a bathroom often means a slow leak inside the wall. The smell of rotten eggs near the water heater, furnace or range calls for an immediate gas check, and it should be repaired before you move forward with the purchase.
Converted garages and back rooms deserve a careful sniff. Many Valley homes have living space that was added without permits, and the drains in those rooms are often installed without proper venting. That shows up as a faint sewer smell that comes and goes with water use in the rest of the house.
Put Your Hands on Things
Try the main water shutoff, gently. Old gate valves often seize after decades of disuse, and one that will not turn needs replacement before it fails during an emergency. Touch exposed supply pipes for dampness, and on slab foundations, walk barefoot or press a palm to the floor in the rooms near the kitchen and bathroom. A warm spot can mean a hot water line is leaking under the concrete.
Look at the water meter, too. With every faucet off, the small leak indicator on the dial should be still. If it moves, water is going somewhere you cannot see.
What No Walkthrough Can Reach
The sewer lateral runs under the yard to the city main, and in Los Angeles that line generally belongs to the homeowner all the way to the connection at the main. In homes of this age it is often clay or cast iron. Pacoima was also among the hardest hit areas in the 1994 Northridge earthquake, and some laterals cracked or shifted underground without any visible sign at the surface. Tree roots find those openings easily.
Only a camera inspection can show the actual condition of that pipe, and it is the one plumbing check worth scheduling on every older home in the area. Before closing, you should also gather a few documents that tell you how the house has been maintained.
- Permit history from the Department of Building and Safety for any additions or conversions.
- The seller’s disclosure on water-conserving fixtures, which California requires for homes built before 1994.
- Receipts for any repiping, sewer work or water heater replacements the seller mentions.
Turning Findings Into an Offer
Whatever you discover becomes leverage once it is written up by a licensed professional with photos or camera footage. A failing water heater or a seized shutoff valve might justify a modest credit. A damaged sewer lateral or a house still running on original galvanized pipe can justify a much larger reduction, a seller-paid repair with permits, or a decision to walk away. The goal is simple. You want to buy the house knowing what is underneath it, rather than finding out during the first week after you move in.
