The answer to 'why is my pressure regulator' is that a malfunctioning pressure regulator can cause a variety of issues in your home's plumbing system. The pressure regulator is responsible for maintaining the optimal water pressure throughout your home, typically between 40-80 PSI. If the regulator is not working properly, it can lead to either high or low water pressure.
Common causes of a problematic pressure regulator include mineral buildup, a faulty spring, or a worn-out diaphragm. Symptoms may include sudden spikes in water pressure, low water flow, or even leaks. To fix the issue, you may need to adjust, clean, or replace the pressure regulator.