Q Every time we flush our toilet, we lose water pressure everywhere
else. We’ve already installed new pipes in our home,
but the problem still occurs. How can this be fixed?
Bob Klein, via e-mail
A Usually, poor water pressure is caused by clogged pipes. But since you’ve
already replaced them, try the obvious first. Make sure the shutoff valves
near the water meter are fully open. Sounds basic, but plumbers still have to
charge $150 for a service call to simply turn a valve handle! Then check the water
pressure. If your house is on city water, ask your local water department for a
pressure reading. A reading of 45 to 55 psi is ideal.
Or test the water pressure yourself with a pressure gauge ($10 at home centers).
Hook up the gauge to an outside water spigot, turn on the water, and
you’ll get an instant reading (photo below). If the reading is low, the city may
be delivering water at a low pressure (less than 40 psi). If the city isn’t likely to
boost the pressure, consider installing a water pressure booster system (bottom photo), starting at $300 at a home center or plumbing store. Two manufacturers
are Simer (800-468-7867, www.simerpump.com) and Aqua Science (800-
767-8731, www.aquascience.net). Any setting over 80 psi will wear out the
washers on your plumbing fixtures. The system we show is only made to fit
1-in. pipe. If you install it yourself, apply for a plumbing permit so your work
will be inspected. Some municipalities require a reduced pressure and backflow
preventer to be installed when a water pressure booster is hooked up.
If the pressure reading is adequate, you may have obstructions or some
pipes that are too small. Call in a licensed plumber to evaluate your system.
Test your water pressure using
an outdoor water spigot.
Click Image to enlarge.
A water pressure booster will
increase the water pressure
in your house. A dial on top
adjusts the pressure to an
ideal setting of 45 to 55 psi.
