Plumbers in Minnesota

The frost line protects the wrong pipe

Minnesota buries deep. The design frost depth around Minneapolis runs on the order of sixty inches, which is why the service line coming into your house sits far below anything winter can reach. Homeowners hear that and reasonably conclude that freezing is handled.

It is not, because the pipe that bursts in a Minnesota January is almost never the buried one. It is the supply main running along an unheated basement wall. It is the run inside an exterior wall cavity behind a kitchen sink. It is whatever passes through a crawl space, an attic or a garage wall on its way somewhere useful. Those runs sit in unconditioned air, and in this state unconditioned air spends months well below freezing rather than dipping there for a night.

The practical consequence is that freeze protection here has to be installed rather than improvised. Foam insulation or listed heat tape on every accessible run in an unheated space, before winter, is ordinary Minnesota maintenance. Dripping a tap during a cold snap is a useful last resort, not a plan.

And one line gets forgotten more than any other: the sump discharge. If it freezes, the pump runs faithfully, finds nowhere to send the water, and the pit overflows. The basement floods with a pump that tests perfectly.

What the water is actually like

There is a persistent belief, encouraged by people selling softeners, that the Twin Cities have some of the hardest water in the Midwest. The utilities’ own numbers say otherwise.

Minneapolis and Saint Paul both draw from the Mississippi and both treat it with lime softening. Saint Paul Regional Water Services reports finished hardness of roughly sixty-four to eighty-five milligrams per litre, which is about four to five grains per gallon, reduced from raw water averaging near ten grains. Minneapolis removes something like sixty-five thousand pounds of hardness from its water every day. The Minnesota Department of Health puts the threshold for considering a softener at seven grains, and explicitly tells homeowners to check whether their community already softens the water first.

For most Twin Cities addresses, that check ends the conversation. Move out of the metro and it reopens completely, because greater Minnesota runs largely on private wells drawing from limestone and glacial aquifers, and those can be considerably harder, with iron and manganese staining as a separate problem that a softener does not solve. Test at your own tap. It is the only number that describes your house.

Basements, and the two problems that look identical

A great many Minnesota basements sit lower than the sewer main outside, which produces two different failures with one symptom.

Water coming up through a floor drain is the sewer surcharging and relieving through the lowest available opening, which happens to be your floor. The fix is a backwater valve on the house drain that closes when the sewer pushes back. Clean groundwater seeping in around the floor edge and the wall joint is hydrostatic pressure from saturated ground, usually during the melt, and the fix there is a sump pump with a battery or water-powered backup. Plenty of houses have both problems and need both answers.

Autumn is when to establish which you have, because spring is when you find out the hard way.

Cabins, and the season that ends in October

Minnesota has a plumbing calendar that most states do not: thousands of seasonal properties that go from occupied to unheated in a single weekend.

A cabin closed with water still in the lines is the most reliably predictable burst in the state. Doing it properly means shutting off at the main, draining the supply lines from the lowest point until they are genuinely empty, draining the water heater, and putting non-toxic antifreeze into every trap including floor drains and toilets. Wells need their own attention at the pump and pressure tank. Leaving the heat on low is a sensible addition on top of all that, and a poor substitute for any of it.

Every plumber we dispatch in Minnesota holds the state licence issued through the Department of Labor and Industry and pulls the local permit where the work requires one.