What’s included
- Static water pressure measured at a hose bib
- Working regulators reset to a safe pressure
- Worn regulators replaced with the same size in the same place
- Waterlogged expansion tanks replaced
- Expansion tanks added on the heater’s cold supply where missing
- Tank air charge set to match house pressure
What we don’t do
- Relocating fixtures, or running new water or drain lines.
- Gas piping, apart from reconnecting the same flex connector.
- Main sewer lines, under-slab leaks and buried pipes.
In Alhambra homes
With about 77 percent of Alhambra homes built before 1980, per a city housing report, many have original or long-serving regulators that slowly lose their setting. Section 608.2 of the California Plumbing Code requires a regulator, with a strainer ahead of it, wherever static pressure exceeds 80 psi, bringing it to 80 psi or less, plus an expansion tank on the cold piping downstream of the regulator.
Get a quote in one text
Send photos of the regulator on your main line if you can find it, the water heater and anything mounted near it, and a gauge reading if you have one. Our number for photos is (310) 628-9399, and the price comes back before any work is booked.
Closed systems
Section 608.3 of the plumbing code requires an expansion tank whenever a check valve, backflow preventer or other closed device keeps pressure from easing back to the main. Tankless heaters are exempt.
Signs of high pressure
Banging pipes, a relief valve that drips, toilets that run after filling, and supply lines that fail early. A gauge reading settles it.
Finding the regulator
In most Alhambra houses it sits on the main line where it enters the house, often near the front hose bib. Some older homes have none.
Testing the tank
A working tank sounds hollow at the top when tapped. A tank that feels heavy and sounds solid, or spits water at its air valve, has a failed bladder.
Pre-charge
A new tank’s air charge is set to match the house pressure before it is installed, so it can absorb expansion from the start.
Adjusting vs. replacing
A working regulator is reset with its adjusting screw. One that drifts back up after adjustment is worn and gets replaced.
Strainers
Section 608.2 calls for a strainer ahead of regulators smaller than 1½ inches. Many residential regulators have one built in, and we clean it during service.
Relief valve drips
A relief valve that drips during or after a heating cycle often points to thermal expansion. A working expansion tank usually stops it.
Condos
In a condo, the regulator may serve the whole building. We work on equipment inside your unit, such as the heater’s expansion tank.
Water off
A regulator or tank swap needs the water off; how long depends on the job, and we’ll tell you after seeing photos.
Where our part ends
Adding a regulator where none exists on buried pipe, re-piping the main, or anything at the meter is outside our scope.
In older Alhambra houses this job often turns up next to water heater repair & replacement, hose bib and shutoff valve replacement, burst pipe repair and shower head and tub spout replacement, so mention those when you text and we can price them together.
Sources: City of Alhambra, housing needs report (age of housing stock); 2025 California Plumbing Code, section 608.2; 2025 California Plumbing Code, section 608.3.
Pressure regulator and expansion tank questions from Alhambra homeowners
Related guide: Pressure regulator and expansion tank service tips from our guide to low water pressure.
Why does my water pressure go up and down?
A failing regulator. We test and replace it.
How much does a pressure regulator cost to replace?
Depends on size and access. Send photos.
Why does my expansion tank keep failing?
High pressure or a waterlogged tank. We test both.
Repair guides for this job
- Replacing a toilet without harming a vintage tile floorReplacing a toilet in an Alhambra bath with original 1920s or 1930s tile: measuring the rough-in, repairing the flange and protecting the old floor.
- Low water pressure at one faucet, shower or toiletWhy one faucet, shower or toilet in an older Alhambra house runs weak, the quick checks you can do first, and what a repair visit looks like.
- Replacing a garbage disposal under an older kitchen sinkWhat to check when a disposal hums, leaks or will not turn on, and how we fit a new one under the deep vintage sinks found in older Alhambra kitchens.
- Fitting a new faucet to an old sinkHow to tell which new faucets fit an older sink, why vintage wall-mount and widespread sinks need care, and what our faucet replacement visit involves.
Looking for a handyman in Alhambra for more than one job? Send the whole list and we’ll price it together.
We serve Alhambra first, plus Monterey Park, San Gabriel and other nearby cities. Have a question? See the handyman FAQ.
