Michigan · Cold/Snow climate zone
Home maintenance in Michigan
A lot of Michigan homes aren't connected to much. About a quarter of Michigan households draw their water from a private well, roughly 1.12 million of them, and there are around 1.3 million septic systems in the state. If that's your house, you don't have a water utility and you don't have a sewer department. You have equipment in your yard, and you are the person responsible for it.
That changes what a maintenance schedule has to cover here. A checklist written for a house on city water and city sewer skips the two most expensive systems a Michigan homeowner actually owns.
The weather does its part too. Michigan is the only state with lake effect coming off water on both sides, so the snow belts along Lake Michigan and across the Upper Peninsula pile up far more than the numbers in Detroit or Lansing suggest. And the state runs long north to south. The Upper Peninsula and the southern tier are not on the same calendar and never have been.
Your Michigan schedule accounts for the well, the septic system, and a winter that arrives at different times depending on how far north you are.
The calendar
Freeze timing in Michigan
Michigan stretches far enough north to south that a single statewide date would be wrong for most of the state. Think in three bands: the southern tier below roughly Lansing, the northern Lower Peninsula, and the Upper Peninsula, where winter arrives first and leaves last.
Even in the southern half, fall comes earlier than people expect. MSU Extension's freeze climatology, built from 53 Michigan sites, puts Lansing's 30th percentile for a first 32°F night at September 30. Roughly three years in ten, Lansing has already had its first freeze before October starts. Move north and that date moves with you.
What that means for the house:
Late August into September — Well and septic work while the ground is still workable. If your septic tank is due for pumping, book it now rather than after the ground firms up. Same for any well cap or wellhead repair. September — Furnace service. In the snow belt counties, this is also when you check the attic, before the first real snow. See note 3. Late September in the north, first half of October in the south — Hoses disconnected and drained, outdoor spigots shut off at the interior valve. Because northern Michigan and southern Michigan freeze weeks apart, this is one of the tasks a national checklist gets most wrong here. Before the ground freezes — Mark the septic tank lid and the wellhead if snow cover makes them hard to find. A plow blade or a pumping truck that can't locate the lid becomes an expensive spring. After leaf drop — Gutters. Overflowing gutters are the first ingredient in an ice dam. Spring thaw — Walk the yard over the drain field. Soggy ground, standing water, or grass that's greener over the field than anywhere else is the classic early sign of a septic system in trouble.
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What's different about Michigan
Your well is your water utility
Roughly 1.12 million Michigan households are on private wells, with about 15,000 new wells drilled every year. Here's the part that catches people: your well was tested when it was drilled, and after that, nobody tests it unless you do. Michigan has no statewide requirement for ongoing private well testing. A community water system is legally required to test and report. You aren't, and no one is doing it for you.
So this belongs on a schedule, not on a hope.
Every year: MDHHS recommends testing for coliform bacteria and E. coli, plus nitrate and nitrite. Basic tests through a county health department are inexpensive, and EGLE maintains a list of certified labs.
Every three to five years: arsenic and lead. Arsenic occurs naturally in Michigan groundwater, and it's common enough in parts of the state that this isn't an optional add-on.
At least once: PFAS, particularly if you're near a known source.
Also every year: walk the wellhead itself. Check that the cap is sealed and undamaged, that the casing extends well above grade, and that the ground slopes away from it rather than toward it. Test again after any flooding, after any work on the well, or after any change in how the water tastes or smells.
Bacteria, nitrate, and arsenic are all colorless and odorless at the levels where they matter. Waiting until the water looks wrong is not a plan.
Your septic system, in the one state with no code
Michigan has roughly 1.3 million septic systems and is the only state in the country without a statewide sanitary code for them. Authority sits with local health departments instead, and as of early 2026 only about a dozen of Michigan's 83 counties have their own septic ordinances. In practice, unless your county has a time-of-sale inspection rule, a septic system here can go decades without anyone looking at it. EGLE estimates that as many as a quarter of the state's systems are failing in some way.
Which means the inspection schedule is yours to set, because in most of Michigan nobody is going to set it for you.
Every three to five years: have the tank pumped. Frequency depends on tank size and household size, and a smaller tank with more people in the house runs toward the short end.
Every year: walk the drain field in spring. Standing water, soggy ground, unusually green grass over the field, or a smell outside are all early warnings. Catching a problem here is a repair. Missing it can run past $20,000.
Ongoing: keep vehicles off the drain field, keep tree roots away from it, and keep grease, wipes, and anything labeled "flushable" out of the system.
If you're buying: ask whether your county has a time-of-sale ordinance. Most don't, which means the inspection is on you to request rather than something the transaction will surface automatically.
One more reason to stay ahead of it: if you're on both a well and a septic system, they're neighbors. A failing drain field is one of the most common ways nitrate and bacteria reach a private well, so those two notes above are really one system.
Ice dams, and why the fix is in your attic
Michigan is the only state that gets lake effect snow off water on both sides. The belts along Lake Michigan's shore and across the Upper Peninsula pick up far more snow than the totals reported in Detroit or Lansing, and that snow sits on roofs for months rather than melting off between storms.
An ice dam forms when heat escaping from the house melts snow on the upper roof, the water runs down to the cold overhang, and it refreezes there. The ridge of ice that builds up blocks the next round of meltwater, which then backs up under the shingles and into the house. People see the icicles and assume the problem is on the roof. It usually isn't.
The fix is an attic problem, and it's a fall task:
Every September or October: get into the attic and look. Insulation should be even and at full depth, with no compressed or missing patches, especially over exterior walls. Soffit vents should be clear, not stuffed with insulation. Bath fans and dryer vents should exhaust outside, not into the attic space. On a cold day after snowfall: look at your roof and your neighbors'. If your snow is melting off and theirs isn't, that's heat leaving your house, and it will build a dam at the eaves. During winter: a roof rake pulls snow off the lower few feet of roof from the ground and buys time. It treats the symptom. The attic is the cause.
Chipping at ice with anything sharp damages shingles and flashing, and every year someone falls off a ladder doing it. If a dam has already formed and water is coming in, that's a call to a professional, not a Saturday project.
The Michigan maintenance year
A sample from the reviewed task library for this climate zone — your full schedule comes from the generator above.
Summer
Inspect and reseal the deck · Yearly check; reseal every 2–3 years · 20 minutes to check; a weekend to seal
Sprinkle water on the boards; it should bead up on sealed wood. If it soaks in, the deck is absorbing rain and it's time to reseal. Check your forecast and plan to work on this during a week with no rain.
Wash siding · Yearly · 2 hours
A yearly rinse removes the mildew film before it becomes a scrubbing job. It's also your best chance to spot loose or damaged siding up close.
Trim vegetation back from the house · Yearly · 1 hour
Branches that touch the house give insects a bridge and hold moisture against the siding. Aim for at least a foot of clearance all the way around. Note: Many insurers will require this to issue or renew your homeowners insurance.
All year
Change the furnace filter · Every 3 months · 10 minutes
A clogged filter forces the furnace to work harder and wear out sooner. Check it monthly and replace it when it looks gray and dusty. Hint: buy multiple filters so you have them on hand next month!
Timing in this zone: check monthly December–February, when the furnace runs hardest
Test smoke detectors · Every 6 months · 5 minutes
Smoke detectors only work if the batteries do. It's recommended to test every detector twice a year and replace batteries as needed.
Test carbon monoxide detectors · Every 6 months · 5 minutes
Carbon monoxide is invisible and odorless, so the detector is your only warning. Test it twice a year, especially before heating season.
Timing in this zone: test before heating season starts, when CO risk rises
Fall
Disconnect and drain garden hoses · Yearly · 10 minutes
A connected hose traps water in the spigot pipe, and a hard freeze can crack that pipe inside the wall. Disconnect and drain hoses before the first hard freeze.
Timing in this zone: late September
Shut off and drain exterior spigots · Yearly · 15 minutes
Closing the interior shutoff and draining the line removes the freeze risk entirely. It's recommended even if you have frost-free spigots.
Timing in this zone: strongly worth doing even with frost-free spigots
Winterize the irrigation system · Yearly · 30 minutes to book a blowout, or DIY with a compressor
Water left in buried lines freezes and splits fittings you can't see until spring. Schedule a blowout, or DIY with a compressor, before the first hard freeze.
Timing in this zone: late September–early October
Winter
Watch for ice dams at the roof edge · After heavy snow + thaw cycles · 5 minutes from the driveway
A thick ridge of ice at the gutter line means snowmelt is backing up under the shingles. After heavy snow, a glance from the driveway tells you if one is forming.
Timing in this zone: a standing habit
Let faucets drip during deep freezes · During deep-freeze events · 2 minutes
Moving water is much harder to freeze. On subzero nights, a thin stream from faucets on outside walls is cheap insurance against burst pipes.
Timing in this zone: any multi-day stretch below about 0°F
Check that the sump discharge line isn't frozen · Monthly in winter, and during thaws · 5 minutes
If the discharge line freezes, the pump pushes against a plug of ice until it burns out or the pit overflows. Check the outlet during cold snaps and thaws.
Spring
Test the sump pump · Yearly (plus after long idle spells) · 15 minutes
Spring melt and heavy rain tend to arrive together, and the pump needs to be ready. Pour a bucket of water into the pit and confirm it kicks on and drains. While you're there, take a look in the pic and remove any debris.
Timing in this zone: test in early March, before the big melt
Check sump pump backup battery · Yearly · 10 minutes
The storms that flood basements often knock out power too. Check the backup battery's charge and age each spring.
Clean gutters and downspouts (spring pass) · Twice a year · 1–2 hours
Winter leaves gutters full of grit and seed pods. Clogged gutters send water toward the foundation, so it's worth clearing them each spring. This will help heavy spring rain water drain properly.
Michigan questions
How often should I test my well water in Michigan?
MDHHS recommends testing annually for coliform bacteria, E. coli, nitrate, and nitrite. Arsenic and lead should be tested every three to five years, and PFAS at least once. Michigan has no statewide requirement for ongoing private well testing, so nobody will do it unless you arrange it.
How often should a septic tank be pumped in Michigan?
Every three to five years for most households, sooner if you have a smaller tank or more people in the house. Michigan is the only state without a statewide septic code, and only about a dozen of its 83 counties have local ordinances, so in most of the state no one is tracking this for you.
Does Michigan require septic inspections?
Not statewide. Michigan is the only state in the country without a statewide sanitary code for septic systems, and authority rests with local health departments. Some counties have time-of-sale ordinances requiring inspection when a home is sold, but most don't. EGLE estimates as many as a quarter of Michigan's roughly 1.3 million systems are failing in some way.
Is radon a problem in Michigan?
Less broadly than in neighboring states, but not zero. Nine Michigan counties are in the EPA's highest radon zone, all in the southern tier: Branch, Calhoun, Cass, Hillsdale, Jackson, Kalamazoo, Lenawee, St. Joseph, and Washtenaw. Elevated radon has been found in homes in all zones, so testing is still the only way to know, and the EPA action level is 4 pCi/L everywhere.
When should you change the furnace filter in Michigan?
check monthly December–February, when the furnace runs hardest. A clogged filter forces the furnace to work harder and wear out sooner. Check it monthly and replace it when it looks gray and dusty. Hint: buy multiple filters so you have them on hand next month!
When should you test carbon monoxide detectors in Michigan?
test before heating season starts, when CO risk rises. Carbon monoxide is invisible and odorless, so the detector is your only warning. Test it twice a year, especially before heating season.
When should you refill water softener salt in Michigan?
Definitely check before the cold sets in. An empty salt tank stops protecting your pipes and appliances from scale buildup. Check the level monthly and keep the tank at least half full.
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