Keep the pump and pressure tank in an enclosed, insulated space, and protect the small-diameter lines first. Those freeze long before the tank does. Most freeze-ups out here aren't the tank itself. They're the pressure switch tube, an exposed line coming into the well house, or a hydrant that didn't drain. Heat is the last layer, not the first.
Around Hotchkiss, Olathe, and Delta, the first hard freezes tend to show up before anybody has finished putting the season away. Cold air settles into the valley bottoms overnight, and a well house that was fine all October gets caught the first morning it really drops.
What Freezes First on a Well System?
The small stuff freezes first: the pressure switch tube, exposed fittings, and any line running through open air. A full pressure tank has mass and takes a good while to give up its heat. The little nipple feeding the pressure switch has almost none, and when it plugs with ice the switch loses its signal and the pump either won't start or won't shut off.
That's why a pump that "froze" usually didn't. Something upstream or downstream of it did.
Worth checking before the first hard freeze:
- The tube or nipple between the pressure switch and the tank tee
- Exposed fittings where the line enters the well house
- The pitless adapter connection at the casing, and anything above it
- Yard hydrants that didn't fully drain after the last use
- The line out to a stock tank or a spigot still sitting charged
How Do You Set Up Well House Freeze Protection?
Make the well house tight first, then add heat only to cover what insulation can't. Air leaks do more damage than thin walls. Rigid foam board on the walls and ceiling, weatherstripping on the door, and a plug in any unused penetration gets most people through a normal North Fork winter.
If you do need heat, use a thermostatically controlled source sized for the space and keep it well clear of anything that burns. The folks who don't get caught build in redundancy, running two smaller heat sources instead of one, so a failed thermostat doesn't take the whole system down with it.
What If the Pressure Tank Is in an Unheated Space?
A pressure tank in an unheated crawl space, garage, or shed needs an insulated enclosure built around it, not a blanket draped over the top. The point is to trap the small amount of heat the pump motor and the incoming water give off, and an open blanket lets that heat walk right out.
Build or buy a box and leave yourself room to reach the switch and the tank tee without tearing it apart in January. If the space is attached to the house, moving the tank inside the heated envelope usually beats fighting it every winter.
Whatever you build, insulate the switch tube itself. It's the piece people skip, and it's the piece that freezes.
Is Heat Tape a Good Idea for a Well Pump?
Heat cable works well on exposed lines and poorly as a substitute for an enclosure. It's made to hold a line above freezing, not to heat a room, and it's electrical equipment sitting on a water system. Use cable that's listed for the pipe you're putting it on, install it exactly the way the label says, and put it on a circuit your electrician is comfortable with.
Self-regulating cable is what most people end up running, because it backs its own output off as the pipe warms. Cover it with insulation once it's on. Bare cable loses most of its heat to the air instead of to the pipe.
And give it a way to fail where you'll notice. Heat cable with no thermostat and no way to check it is a system you learn about when the water stops.
What Do You Do If the Line Already Froze?
Shut the pump breaker off first, then warm the frozen section slowly. A pump pushing against a plug of ice is a pump you're buying again. Work gentle heat along the line toward the blockage with a hair dryer, a heat gun on low, or a heating pad. Never a torch.
If you can't find it, or the line is buried, call a well contractor. A poly line that split while frozen won't show you where until it thaws out.
For Growers and Contractors: Pasture and Orchard Systems
The same freeze points show up on stock water and orchard systems, just spread across more ground. A float valve on a stock tank, the riser to a yard hydrant, a pump feeding a micro-sprinkler block in a peach orchard. Each one is a small line standing in open air. Growers who already pulled water for the season still have domestic and stock lines charged all winter.
If you're replacing something that's been patched one too many times, this is the season the material choice pays for itself. Poly line handles ground movement and freeze-thaw better than rigid pipe, and a frost-free hydrant is designed to drain its own riser after each use, provided it was set where it can actually drain. We stock those alongside Zoeller pumps, Norwesco tanks, and the Philmac and A.Y. McDonald fittings that go with them. Have a look at the water systems we supply across Western Colorado.
Common Questions
Will a frozen pressure tank crack?
It can, but the fittings usually go first. The switch tube and the tank tee are smaller and thinner walled, so they split while the tank body is still half liquid. By the time a tank has frozen solid you have already lost the plumbing around it. Protect the small parts and the tank looks after itself.
Can you leave a well pump running to keep it from freezing?
Running the pump constantly isn't the answer, but keeping water moving is. During a severe cold snap, letting a faucet run a small steady stream pulls warmer groundwater up through the system. That's a measure for a few brutal nights, not a winter strategy, and it does nothing for a line with no flow through it.
Does a submersible well pump need freeze protection?
The pump itself usually doesn't, because it hangs in the water column where frost never reaches. What needs protecting is everything between the well and the house: the pitless connection, the line over to the pressure tank, the tank, and the pressure switch. Those sit in air that gets cold.
When should you winterize a well in Western Colorado?
Before the first hard freeze, which in the North Fork Valley has a habit of arriving while there's still fall work left to do. If you're already shutting irrigation down for the season, that's the week to walk the well house too. Doing both in one pass beats finding the problem at six on a cold morning.
Freeze protection comes down to the small lines and a tight enclosure. The expensive equipment is rarely what fails first. If you're putting a well house together or replacing a hydrant, come see us in Hotchkiss or Olathe. Send us your plans and we'll put together an accurate materials list.
