Homeowner Basics

No Water From the Well in Winter: Finding and Thawing a Frozen Line Safely

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On this page
  1. Where a Well System Freezes
  2. What to Do
  3. Test the Water After a Freeze
  4. Prevent It
  5. When to Call a Licensed Well Contractor
  6. Frequently Asked Questions
  7. The Bottom Line
  8. Sources

When the taps go dry in a cold snap and your water comes from a private well, the cause is almost always a frozen pipe above ground, not the well itself. A submersible pump sits deep in the well, and University of Nebraska–Lincoln Extension says it "does not need frost protection since it is located below the frost line, and the groundwater in which it is located will not freeze." The weak spots are the parts above the frost line: a jet pump, a pressure tank, and pipes in an unheated well house, pit, crawl space, or basement corner.

This guide covers the safe first checks, how to thaw a frozen section, why the water needs testing afterward, and when the job belongs to a licensed well contractor.

Shut off the pump's power before you look. Well pumps run on high voltage, and well houses and pits are often damp. The National Environmental Health Association's CDC-funded guidance says to "turn off power to the well before inspecting the area due to the danger of electrical shock due to dampness or wetness," and Flotec's pump manual says to "disconnect power before working on pump, motor, pressure switch, or wiring." Leaving the power on also lets the pump run with no water, which Flotec warns can overheat it and damage the seal.

Where a Well System Freezes

  • Above-ground pumps. UNL Extension says a jet pump "is easy to access for repairs but requires frost protection." The National Ground Water Association notes that across a large section of the South and Midwest, pumping systems are built above ground or above the frost line.
  • Pipes in unheated spaces. The Water Systems Council points to unheated areas "such as a crawl space or basement area," along with well houses and pits.
  • Not usually the pump or the buried line. The Water Systems Council says "most well pumps are down inside the well at depths that do not freeze," and UNL says a pitless adapter and the pipe from it sit deeper than the frost line, so "the water will not freeze."

What to Do

  1. Turn off the power to the pump at its breaker or disconnect, as above.
  2. Open a faucet nearest the well, so melting water has somewhere to go and you'll know when it flows.
  3. Find the cold section. Look along exposed pipe in the well house, pit, crawl space, or basement wall where the line comes in, and at the pump and pressure tank if they're above ground. Frost on the pipe or a section that's colder to the touch is the likely spot.
  4. Warm it gently. The Water Systems Council suggests "an electric heating pad wrapped around the pipe" or "an electric hair dryer." Never use a torch or any open flame; as our frozen pipes guide explains, it's a fire risk and can make the pipe burst. Keep electric tools away from standing water.
  5. Restore power once water flows at the open faucet, then check every exposed pipe and fitting for drips. The Water Systems Council warns that frozen pipes "are very likely to burst."

If you can't find the frozen section, or it's inside the well, the buried line, or the pump, stop there. NEHA says to "contact a licensed well contractor for repairs if any components of your well freeze."

Test the Water After a Freeze

The EPA and CDC both say to test your well water when you "replace or repair any part of your well system." NEHA says that after a freeze you should test for "coliform bacteria, E. coli bacteria, and nitrate to make sure it is safe before use," at a certified laboratory, and that "if your water is contaminated or repairs were performed, you may need to have the well professionally disinfected." Your local health department can point you to a certified lab.

Prevent It

  • Insulate. NEHA says to insulate the well house and above-ground piping and to cover a well pit with insulation or straw. NGWA says a small insulated enclosure over an above-ground pump "will help keep the system above 32 degrees."
  • Use listed heat cable, installed by the book. NEHA suggests heat tape or heat cable in a single layer on pipes in a well house or pit. The CPSC says to use tape certified to UL standards, plug it into a GFCI-protected outlet, put it directly on the pipe and never over insulation, not wrap it over itself unless the maker allows it, and never use foam or vinyl insulation over it. Our heat tape guide covers the choices.
  • Don't leave a space heater or heat lamp running unattended. Some well guides suggest a heater in the well house, but the CPSC's rules for portable heaters are 3 feet of clearance from anything that can burn, plugged straight into a wall outlet, kept away from water, and never left on while you're away or asleep. An unattended, damp well house fails those rules, so use insulation and listed heat cable instead.
  • Keep water moving in a deep freeze. The Water Systems Council says running water through the pipe "will help to keep it from freezing," and NEHA suggests someone run water regularly if you're away more than a week. Our pipe freeze check shows when tonight's forecast calls for it.
  • Fix the design for good. If an above-ground line freezes every winter, ask a licensed well contractor about burying it below the frost line or installing a pitless adapter, as the Water Systems Council suggests.

When to Call a Licensed Well Contractor

  • The frozen section is in the well, the buried line, or the pump, or you can't find it.
  • A pipe, fitting, or the pressure tank cracked or leaks after thawing.
  • The pump runs but no water comes, or it won't start once thawed.
  • The water tests positive, or the well needs disinfecting. CDC says wells should be disinfected by a well or pump contractor.

NEHA suggests finding a licensed well contractor through your local health department, environmental or natural resources department, or extension service.

Frequently Asked Questions

Can a well itself freeze?

The water down in the well doesn't. UNL Extension says the groundwater around a submersible pump "will not freeze" because it sits below the frost line. What freezes is pipe and equipment above the frost line, such as a jet pump, pressure tank, or exposed line.

Should I keep the pump on while the line is frozen?

No. Turn its power off. With no water reaching it, the pump can run dry, which Flotec warns can overheat it and damage the seal, and the area around it is a shock risk while it's damp.

Is the water safe to drink after the line thaws?

Not until it's tested if anything was repaired or replaced. The EPA, CDC, and NEHA all say to test after repairs, for coliform bacteria, E. coli, and nitrate, at a certified lab.

Can I put a space heater in the well house?

Not left running on its own. The CPSC says never to leave a portable heater on while you're away or asleep, to keep it 3 feet from anything that can burn, and to keep it away from water. Insulation and UL-listed heat cable on a GFCI outlet are the safer setup for an unattended well house.

The Bottom Line

No water in a cold snap usually means a frozen pipe above the frost line. Turn off the pump's power, open a faucet, warm the frozen section gently with a hair dryer or heating pad, never a flame, and check for leaks before you turn the power back on. Test the water after any repair, and call a licensed well contractor for anything inside the well or underground.

Sources

Last reviewed October 24, 2026. General information, not professional advice — work inside the well, on the pump, pressure switch, or wiring, and any disinfection belong to a licensed well contractor or pump installer.

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