The answer to 'why is my pressure regulator leaking water' is that the pressure regulator is likely worn out or damaged, causing it to leak. Pressure regulators are designed to reduce the high water pressure from municipal water supplies to a safe level for home plumbing systems. Over time, the internal components can wear down or become corroded, leading to leaks.
Common signs of a leaking pressure regulator include water dripping from the regulator, a puddle forming around the regulator, or reduced water pressure throughout your home. If left unchecked, a leaking regulator can cause water damage and increase your water bills. In most cases, the best solution is to replace the entire pressure regulator assembly. This is a job best handled by a professional plumber, as they have the right tools and expertise to properly install a new regulator and ensure your home's water pressure is set correctly.