- Your Water
- Water Pressure
Water pressure within the water distribution system will vary depending on the elevation of your property in relation to the location of the reservoirs that support your area. Peak water use and routine water system maintenance operations can also cause water pressure to fluctuate in nearby areas.
SBMWD has created an interactive map to help customers locate the average water pressure for properties. The data used to generate this map is dynamic, represents a range only, and the pressure is not static and can fluctuate with demand. This information should not be used for development or site improvement purposes. Please contact SBMWD Engineering at (909) 453-6175 for additional information on water pressure in your area.
A decrease in water pressure could be caused by issues with the customer side plumbing system. The following list may help customers identify the source of low pressure.
Customers using water softener devices may experience a decrease in water pressure due to incorrect sizing, clogs, or after plumbing services if the valve is not fully reopened.
Pressure reducing valve
If a pressure regulator is installed on the property but there is excessively low pressure at every faucet the regulator should be checked by a qualified plumber to ensure appropriate settings.
Low water pressure at one or only some of the faucets may be due to a buildup of mineral deposits from hard water.
Hot Water Heater:
Low pressure with hot water only may be an issue with the water heater. Check the shut-off valve near the water heater to ensure it is fully open or consult a qualified plumber.
Customer side water valves
The customer side water valve is located in the water meter box on the side closest to the home. The valve is turned “on” (opened) or “off” (closed) with a handle which should be able to move easily, without much force. Ensure the customer valve is fully open by carefully turning the handle parallel with the inlet pipe.
Private shutoff valves
The private shutoff valve is typically located at a hose bib in front of the property. If the private shutoff is closed or partially in the closed position water flow to the home will be restricted causing lowered water pressure.
Customer side leaks
Undetected leaks on the property are a common cause of lowered water pressure. The water meter is an excellent tool to help identify leaks on the property. View the How to Read Your Water Meter page to learn more.
The SBMWD service area is divided into multiple pressure zones. Reservoirs are located at higher elevations so water can flow by gravity, and generally homes that are at the lowest elevation from the reservoir will have higher pressure. In higher pressure areas, customers can adjust or install a pressure regulator to reduce the water pressure coming into the home.
Signs of high-water pressure include reoccurring leaks, water heater malfunction, and “clanging” or “rattling” of pipes when a faucet, dishwasher, or washing machine shuts off. Consistently high pressure that exceeds 80 PSI may damage customer side plumbing, appliances and water fixtures over time. A qualified plumber can determine whether a pressure regulator should be installed. An existing pressure regulator may need to be adjusted or serviced by a qualified professional.
How do I know if I have a pressure regulator?
The California Plumbing Code requires pressure regulators to be installed in areas where average water pressure is high enough to damage fixtures and appliances. A pressure regulator is a dome-shaped brass fitting which is typically installed in front of the property, in a garage, or on the inlet pipe connected to an outside hose bib. These regulators are not installed or maintained by the Water Department.