Low Water Pressure: Narrow the Cause Before You Call
Low pressure has many causes—start by narrowing scope
Weak flow at one faucet is often an aerator or supply-stop issue. Whole-house low pressure may involve the meter, pressure regulator (PRV), shared well equipment, or a hidden leak. This page targets low water pressure—not clogged drains (drainage is different from supply).
Need a pro? Call (844) 936-0420 to connect with a local plumbing professional when available.
Informational/referral site—not your water utility or a contractor.
One fixture vs. whole house
Single faucet/shower weak
Unscrew and clean the aerator/shower head screen. Confirm the under-sink stops are fully open. Check if both hot and cold are weak or only one side (water heater or hot-side valve issues).
Whole house weak
Ask neighbors if the utility is working on lines. Note whether pressure fell suddenly or over months. Look for unexplained wet spots, high bills, or meter movement when all fixtures are off—possible leak path; see leak detection and slab leak.
Safer checks
- Fully open the main and fixture stops—partially closed valves are a frequent culprit after DIY work.
- Clean aerators and shower heads of mineral grit.
- Test outdoor hose bibs vs. indoor fixtures to compare.
- If you have a PRV, don’t adjust it randomly; incorrect settings can damage plumbing. Note the gauge reading if one exists for the technician.
- Well systems: check pump power and tank pressure only within your comfort and manufacturer guidance—or call a pro.
When pressure loss is urgent
Call (844) 936-0420 promptly if pressure crashed suddenly with water sounds in walls/slab, flooding, or a spinning meter at zero use. Sudden loss plus wet areas may mean a break—see burst pipe and emergency plumber.
Related guides
FAQ
Is low pressure the same as a clogged drain?
No. Pressure is supply-side. Slow draining is usually waste-line restriction—see clogged drain.
Can hard water cause low flow?
Scale in aerators and older galvanized lines can. Whole-house galvanized narrowing often needs professional evaluation.