We work these homes every week across Norwalk, Whittier, Downey, Bellflower, and La Mirada. We're licensed, bonded, and insured, every diagnosis comes with a written, fixed-price quote, and there's no money down on the bigger jobs. If it's something you can safely check yourself first, we'll tell you that too.
Low water pressure through the whole house
When pressure is weak at every fixture at once, the cause is almost always upstream of your fixtures: a failing pressure-reducing valve (PRV), a partially closed main shut-off, or a corroded main supply line. The hard water across the southeast LA County service area runs roughly 10 to 17 grains per gallon, and that mineral load slowly scales the internal seat of a PRV until it either sticks shut and starves the house or fails open and spikes pressure. On the 1950s and 1960s slab-on-grade tract homes we see all over Norwalk and Bellflower, the more common whole-house culprit is galvanized supply pipe that has corroded closed from the inside. A 3/4-inch galvanized line 60 years old is often narrowed to under a quarter inch of open bore. We gauge-test static pressure at your hose bibb first, then decide whether it's a valve fix or a line problem. Not sure where to start? Call 213-254-8695 and we'll walk you through a quick gauge test over the phone.
Why is my water pressure suddenly low?
A sudden drop, as opposed to a slow decline over years, points to a specific failure event rather than gradual scale buildup. The three we find most: a PRV that finally seized after years of scaling, a chunk of pipe scale or a broken water-heater dip tube shedding debris into your lines and lodging in aerators, or a city-side supply interruption after nearby main work. If the drop happened right after the utility did work on your street, the fix may be nothing more than flushing debris out of your aerators and cartridges. We start by isolating whether the problem is inside your house or on the meter run, because that one answer decides whether this is a 30-minute service call or a real repair.
How to fix low water pressure (what you can safely check yourself)
Before you call anyone, three checks are safe to do yourself and often solve it for free. First, unscrew the aerator on the affected faucet and rinse out the mineral grit. In our hard-water area that alone restores a surprising number of kitchen and bath faucets. Second, confirm both your main shut-off and the angle stops under the fixture are fully open, since a valve knocked half-closed during other work is a common false alarm. Third, if only your hot side is weak, the culprit is usually scale in the water heater or a failing dip tube, not your supply line. If those checks come up empty, or the fix is a PRV, a cartridge, or a corroded line, that's where we come in. Talk to a licensed tech at 213-254-8695.
How to regulate water pressure: PRV replacement
If your static pressure gauges above about 80 psi, or swings wildly, or reads far too low with no line corrosion to explain it, your pressure-reducing valve is the fix. The PRV sits just past your main shut-off and holds incoming street pressure down to a safe, steady 50 to 70 psi so it doesn't hammer your fixtures and water heater. Ours scale up and fail predictably in this hard water, usually inside 8 to 12 years. We replace the valve with a serviceable brass PRV, set it to spec with a gauge, and verify pressure at multiple fixtures before we leave. Where a PRV has failed alongside a bad shut-off, we handle the pressure-reducing valve replacement and the valve work in one visit. Ready when you are: 213-254-8695.
When low pressure is not the right call for us (yet)
Here's the honest version most plumbers won't put in writing. If your whole neighborhood lost pressure at the same time, don't call us first, call your water provider, because it's a city-side main issue and there's nothing on your property to fix. If only one faucet is weak and you haven't cleaned its aerator yet, do that before you pay for a service call. And if a home inspector flagged low pressure but every fixture actually runs fine, you likely don't need any work at all right now. We'd rather tell you to skip the visit than sell you a repair you don't need. When it is a PRV, a repipe, or a corroded supply line, that's exactly the work we do best.
Got questions?
Frequently asked questions
I only have low pressure at one faucet. What's wrong?
Low pressure at a single fixture is almost never a supply-line problem. In our hard-water area it's usually mineral scale packed into that faucet's aerator or a scaled-up cartridge inside the valve body. Unscrew the aerator and rinse the grit out first. If a single-handle faucet is weak on both hot and cold after that, the cartridge is likely scaled and needs replacing, which is a quick service call.
Does hard water cause low water pressure?
Yes, indirectly, and it's the number one reason we get pressure calls in Norwalk, Whittier, Downey, Bellflower, and La Mirada. The southeast LA County supply runs roughly 10 to 17 grains per gallon. Over years that mineral load coats aerators, packs cartridges, and scales the seat inside your pressure-reducing valve until flow drops. It also accelerates corrosion inside older galvanized lines. A water softener slows all of it down, which is why we often recommend one alongside a repair.
When should I call a plumber for low water pressure?
Call once you've cleaned the affected aerators and confirmed your shut-off valves are fully open and pressure is still weak. Also call right away if pressure is low at every fixture at once (a whole-house cause), if it dropped suddenly with no city work nearby, or if you see any sign of a leak such as a running meter with everything off. If the whole neighborhood lost pressure together, contact your water provider first, since that's a supply-side issue, not something on your property.
Are you licensed, bonded and insured?
Yes. Nava's Elite Plumbing carries a current California master plumber registration, $1M general liability coverage, and workers' comp on every technician. A certificate of insurance naming you or your property manager is available on request before we start.
Do you give upfront pricing?
Every job is quoted in writing before any work begins. We price by scope, not by the hour, so the number you approve is the number you pay — barring scope changes you approve in writing.
Do you require money down?
No deposit on standard service calls. On larger projects (repipes, sewer replacements, gas line installs) we phase work into progress payments tied to city inspection milestones — you never pay ahead of completed work.