Water Pressure

The water distribution system is divided into multiple pressure zones. A pressure zone is an area of service supplied by a source or a number of sources that provides a constant hydraulic gradient, or water pressure throughout the zone.

Low Water Pressure
Common causes of low water pressure are incorrectly adjusted valves, a water leak, or use of water during peak demand times. If you experience low water pressure, use these troubleshooting tips to help restore your normal water pressure.
  • Check your house valve
    • Your house valve is usually located at the hose bib. Adjust the house valve counter clockwise to ensure the valve is fully open. When the valve is in the "on" position it will be parallel with the hose bib. If the house valve is in the "off" position (pointing away from the hose bib) water flow to your home will be restricted. If your house valve is a wheel valve, turn counter clockwise to open and clockwise to close.
  • Check your customer valve
    • Your customer valve is located in your meter box on the side closest to your home. This valve looks like a handle and should turn easily by hand. Make sure the customer valve is fully open by turning the handle counter clockwise. The handle is parallel with the meter when it is in the "on" position.
  • Check your pressure regulator
    • Sometimes pressure regulators need to be adjusted or serviced to restore normal water pressure to your home. Pressure regulators should be adjusted carefully. Incorrectly adjusting the regulator can result in water pressure that is too high or too low. Water pressure that is too high can cause some household appliances to malfunction. It is recommended that a qualified plumber make adjustments or repairs to your regulator.
  • Do you have a water softener
    • Customers may notice a decrease in the water pressure after having their water softener serviced. Please check to make sure the service person fully reopened the valve when the service or repairs were completed.
  • Check for mineral deposits
    • If you are experiencing low pressure from one of the faucets in your home it may be due to mineral deposits. Mineral deposits from hard water can clog the aerators on faucets and shower heads. You can restore the water pressure by cleaning the aerators.

If your water pressure is still low after troubleshooting these areas, contact the district at 909-889-9501.

High Water Pressure
The district's service area is divided into multiple pressure zones. Whenever possible water storage tanks (reservoirs) are located at a higher elevation than the area, it serves so water can flow by gravity. 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 their home.

If your water pressure is high, your pressure regulator may need to be adjusted or serviced. It is recommended that a qualified plumber make adjustments to your pressure regulator since incorrectly adjusting the pressure regulator can affect household appliances.

Do I Have a Pressure Regulator?
Many homes are equipped with a pressure regulator. Pressure regulators are bell shaped devices that are usually located on the inlet pipe next to your hose bib and house valve.

Pressure regulators are used to adjust the water pressure to an appropriate pressure for your home. Pressure regulators cannot increase the pressure beyond the maximum pounds per square inch (psi) supplied by the district in your area.