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How to fix a well pump leak

We'll locate the leak, tighten fittings or replace the pressure switch, and tell you when to call a plumber.

How-to · Home plumbing
20–40 min
What you'll need
  • Wrench set
  • Replacement pressure switch (if needed)
  • Thread sealant (Teflon tape or pipe dope)

At a glance

  • Shut off the power to the well pump and close the main water valve.
  • Locate the leak—fittings, pressure switch, or pump housing.
  • Tighten loose fittings with a wrench; do not over-tighten.
  • Replace a leaking pressure switch or switch fitting.
  • Call a plumber if the pump housing is leaking or you are not comfortable.
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Steps

Goal: Shut off the power, locate the leak, fix fittings or the pressure switch, and know when to call a plumber.

  • Shut off the power to the well pump and close the main water valve.
  • Good: Pump is off and pressure is relieved. Proceed to Locate the leak.
  • Bad: Cannot shut off—call a plumber.

Locate the leak

Goal: Identify where the water is escaping.

  • Dry the area. Turn the power on briefly and cycle the pump. Watch where water appears—at fittings, the pressure switch, or the pump.
  • Good: You see the leak location. Proceed to Tighten fittings or Replace pressure switch.
  • Bad: Pump housing is leaking—call a plumber.

Tighten fittings

Goal: Stop leaks at pipe or tank connections.

  • Shut off the power. Use a wrench to snug loose fittings—do not over-tighten. Turn the power back on and cycle the pump.
  • Good: No drips at the fittings.
  • Bad: Pump or pressure tank is leaking—call a plumber.

Replace pressure switch

Goal: Fix a leaking pressure switch.

  • Shut off the power and water. Replace the pressure switch with one that matches the cut-in and cut-out pressure.
  • Good: No leak when the pump cycles.
  • Bad: Pump housing is leaking—call a plumber.

When to get help

Call a plumber if:

  • The pump housing is leaking.
  • The leak is from the well casing.
  • You are not comfortable working on the well system.

Submersible pump repairs require pulling the pump from the well. Do not attempt that yourself.

Verification

  • No drips at fittings, the pressure switch, or the pump when the system runs.
  • Pressure builds and holds normally.
  • Pump cycles on and off as expected.

Reviewed by Blackbox Atlas

Frequently asked questions

Why does my well pump leak?
Common causes: loose fittings at the pump, pressure tank, or pressure switch; a worn pressure switch diaphragm; or a failed seal in the pump housing. Submersible pump leaks usually need a plumber.
Can I fix a well pump leak myself?
Yes, for leaks at above-ground fittings, the pressure switch, or the pressure tank connection. Shut off the power first. If the pump housing is leaking, call a plumber—the pump may need to be pulled.
When should I call a plumber for a well pump leak?
Call a plumber if the pump housing is leaking, the leak is from the well casing, or you are not comfortable. Submersible pump repairs require pulling the pump from the well.

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