CALIFORNIA BACKFLOW & CHLORINATION
Purveyor-ready reports on every job.
Home › Plumbing › Water Pressure Issues
Water Pressure Diagnosis and PRV Repair
High or low water pressure is usually a sign that a pressure regulator valve (PRV) is failing, missing, or undersized. California Backflow & Chlorination diagnoses pressure problems at the source and services the PRV so the system runs at a safe, code-compliant pressure.
Signs of a Pressure Problem
California plumbing code requires a pressure regulator when static street pressure exceeds 80 psi. Without one, or with one that has failed, the excess pressure shows up as damage and nuisance issues throughout the building.
- Banging or hammering pipes when fixtures shut off
- Water heaters, valves, or appliances failing early or repeatedly
- A dripping or weeping temperature and pressure relief valve
- Weak or inconsistent flow at fixtures
What Our Pressure Service Covers
PRV Testing & Adjustment
We test static and working pressure at the point of service, check the PRV’s set point against code, and adjust or replace the valve when it can’t hold a stable pressure.
Thermal Expansion Tanks
When a PRV or check valve closes the system, we install a thermal expansion tank to absorb the pressure increase from a water heater and protect the rest of the plumbing.
Pressure and Your Backflow Preventer
A backflow preventer needs a predictable pressure differential to seal correctly. Unregulated pressure is a common reason an assembly fails its annual test.
Code-Required Pressure Regulation
California plumbing code requires a pressure regulator when static street pressure exceeds 80 psi. We verify your system meets that requirement.
Why Choose California Backflow & Chlorination
Licensed & Insured
C-36 Contractor License #1117687, fully licensed and insured for water-supply plumbing work across Southern California.
Certified Lab Results
Bacteriological samples are processed through our state-certified lab partner, so disinfection results are documented and defensible.
Purveyor-Ready Reports
We deliver same-day, purveyor-ready reports so your project or repair moves straight into compliance without delay.
One Call Does It All
Plumbing repair, chlorination, and ABPA-certified backflow testing under one contractor, with same-day and next-day scheduling.
How We Diagnose and Fix Pressure Problems
Test Static & Working Pressure
We measure pressure at the point of service to confirm whether it exceeds the 80 psi code threshold or has dropped below a usable level.
Inspect the PRV
We check the valve’s set point, condition, and age to determine whether it can be adjusted or needs replacement.
Adjust, Replace, or Add Regulation
We adjust or replace a failing PRV, or install one where none exists, sizing it to the service and fixture demand.
Confirm Stability
We recheck pressure after the fix and verify the backflow preventer and water heater are protected from swings.
Common Questions
What pressure requires a regulator by code?
California plumbing code requires a pressure regulator when static street pressure exceeds 80 psi.
Why do my pipes bang when a faucet shuts off?
Banging or hammering pipes are a common sign of unregulated high pressure or a failing PRV, and usually resolve once the valve is tested and corrected.
Can bad pressure cause my backflow preventer to fail its test?
Yes. A backflow preventer relies on a stable pressure differential to seal correctly, and fluctuating pressure is a common reason an assembly fails its annual test.
Do I need a thermal expansion tank with a new PRV?
Often, yes. Adding a PRV or check valve closes the system, and a thermal expansion tank absorbs the resulting pressure increase from your water heater.
Call (858) 523-8113 for a water pressure and PRV inspection
✔ Same-Day Scheduling ✔ Upfront Pricing ✔ Purveyor-Ready Reports ✔ Licensed & Insured
California Backflow & Chlorination
Licensed C-36 Contractor #1117687
DPR License #140023
ABPA-Certified Backflow Testers
State-Certified Laboratory Partner
Contact
(858) 523-8113
spencer@cal-backflow.com
Serving Los Angeles, Orange, San Diego,
San Bernardino & Riverside Counties