The answer to 'what causes low water pressure in house' is that there are several common causes, including a partially closed main water shut-off valve, mineral buildup in pipes, leaks, and problems with the water heater or pressure regulator. Low water pressure can lead to issues like weak water flow, difficulty filling up containers, and problems with appliances that require adequate water pressure.
To troubleshoot low water pressure, start by checking the main water shut-off valve to ensure it is fully open. You can also inspect the water meter and look for any visible leaks in your plumbing system. Mineral buildup in pipes is another common culprit, which may require professional pipe cleaning or replacement. Issues with the water heater or pressure regulator can also contribute to low pressure, so those components should be checked as well.