Why would high water pressure be dangerous? The safety code states that any home with a pressure reading of 80 psi or higher must have a PRV or pressure reducing valve installed on the system. The reason being is that high water pressure running through your home's pipes to all the fixtures that you use is no different than high blood pressure running through your body's piping system to all the organs.
There are several things that could cause your toilet to make gurgling sounds; a blockage in the toilet or drain for that toilet, a blockage in the vent stack leading up to the roof that may have a nest or leaves in it, or most commonly a main sewer drain blockage. The gurgling sound you hear is from air that escapes backwards into the toilet and is the first sign of a more serious issue occurring and a messy disaster waiting to show itself at the most inopportune time.
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