Basement Flooding: What to Do, in What Order

The order matters more than speed

Rushing into a flooded basement to "get ahead of it" is how people get hurt, or lose a claim they'd otherwise have won. The order below follows the same priority federal and insurance-industry guidance uses: safety, then the water source, then proof, then cleanup, then the claim paperwork — which in Michigan often has its own short deadline, covered below.

The five steps, in order

1. Check for hazards before you step in

If the electrical panel is in the basement, or reaching it means crossing standing water, don't. Call an electrician or your utility instead of guessing whether a circuit is live. If you smell gas, leave the house and call the gas utility from outside — don't flip switches on your way out. Floodwater that entered from outside the home — through a window well, a failed sump, or a storm sewer backup — should be treated as contaminated; Ready.gov's flood guidance calls for heavy gloves, boots, and protective clothing during any cleanup that requires contact with it.

2. Stop the water at its source, if it's safe to

A burst supply line or water heater has a shutoff valve; close it. A failed sump pump is worth a quick check — unplugged, a tripped breaker, or a float switch stuck in the wrong position — before assuming it needs full replacement. Rochester Hills is explicit on this point in its own public guidance: the city owns storm inlet grates and shared development detention structures, but the individual sump discharge line on a residential property is the homeowner's own responsibility to maintain. Water coming from outside, from a storm or a municipal system, usually can't be stopped at the house; skip to extraction once it's safe.

3. Document before you touch anything

Photograph and video the water line on the walls, the extent of the damage, and anything that got wet, before you move furniture, pull up carpet, or discard anything. NAIC's claim-filing guidance is specific on this point: the photos you take now are your evidence later, and once materials are discarded or a wet-vac has already run, that evidence is gone. This step matters even more in Michigan than the national guidance implies, because several Michigan municipalities and counties run their own sewer-backup claim process with a strict filing window — see step 4.

4. Call your insurer, and separately, check whether a municipal claim applies

Michigan homeowners policies typically draw a hard line between water damage (often covered when sudden and accidental, like a burst pipe) and flood damage (generally excluded unless you carry a separate flood policy), according to Michigan DIFS. A basement that floods from a sewer backup usually needs its own endorsement, which many standard policies don't include by default.

Separately from your own insurance claim, if the backup came from a public sewer rather than your own plumbing, several Michigan cities and counties let you file a direct municipal claim under Michigan's Public Act 222 — and the filing window is short, typically 45 days from when you discover the damage, not from when it happened. Who you file with depends on your exact address, because some cities run their own sewers and some have county-operated systems:

• Southfield residents file with the city, not Oakland County — call the Water Department at 248-796-4850 (248-796-4899 after hours), and the backup must have come from the city sewer system, not the home's own plumbing, to qualify.
• Royal Oak city is not covered by Oakland County's claim program (Royal Oak Township is handled differently); Royal Oak city residents report a backup through the city's online form or 248-246-3000.
• Troy and Rochester Hills both run their own sewer collection and are not on Oakland County's operated-sewer list, so a backup claim in either city starts with the city, not the county's PA 222 process.
• Farmington Hills residents report to the Oakland County Water Resources Commissioner at (248) 858-1127, and the written claim must show the public sewer had a known defect the city didn't fix in time, and that the defect caused at least half the damage.
• Clinton Township and other Macomb County communities route through the Macomb County Public Works 24-hour hotline, (877) 679-4337, with the written claim going to the Public Works Commissioner at 21777 Dunham Road, Clinton Township, MI 48036 — within the same 45-day window, after which, per the Commissioner's own notice, state law bars recovery of damages.
• Birmingham had 178 flooding reports, including basement and sewer-backup water, during a single August 24, 2023 storm that recorded 3.62 inches of rain per hour at the city's own Fire Station No. 1, beyond a 500-year storm rate; the same 45-day written-claim rule under Public Act 222 applies there.

If you're not sure whether your community runs its own sewer or relies on the county, check the Oakland County Water Resources Commissioner's basement-flooding claim page or call your city's public works line directly before the 45-day window closes — this deadline is separate from, and shorter than, most insurance claim-filing deadlines, so it's the one most homeowners miss. Make this call, or have someone else in the house make it, once the area is safe and the source is stopped; it does not have to finish before extraction starts in step 5 below, and with a second person or a few free minutes it can run at the same time as the first pumps and fans going in.

5. Start extraction and drying

Once the area is safe, the source is stopped, and the damage is documented, get standing water out and air moving — in parallel with the insurer and municipal calls above, not after them, since the EPA's drying clock below does not pause for a phone call. The EPA's benchmark is 24 to 48 hours to dry a water-damaged area before mold becomes likely — see what is mold remediation for what happens if that window is missed. A sump pump, wet vac, or pump-out truck for larger volumes, followed by fans and a dehumidifier, is the typical sequence. For the licensing and process detail behind this phase, see what is water damage restoration, and for more first-hour guidance across other kinds of losses, see the what-to-do-first guides category.

Why Michigan basements flood, specifically

Most Michigan homes sit on a basement or crawlspace below grade because of frost-depth footing requirements in the state building code, which push foundations down regardless, making a basement the default rather than added cost. That's the general construction reason. The specific triggers differ by community, and none of them are generic:

• Named storms with a federal disaster declaration. Michigan has at least one federally declared flood disaster on record: FEMA's DR-4607-MI, tied to the same late-June 2021 storms the National Weather Service documented hitting Metro Detroit, including Bloomfield Township at 4.39 inches of rain. (Check FEMA's own disaster page for the exact counties and assistance types a given address qualifies under — that detail can change by amendment and isn't restated here.) The earlier August 11, 2014 storm sent the Red Run Drain, which runs through Warren, far above its normal level — Detroit Metro Airport measured 4.57 inches of rain that day, with some nearby suburban areas getting up to 6.25 inches, overwhelming a drain system built for roughly two inches, and flooded basements across the region.
• Named local waterways, not "rain" in general. Clinton Township sits along the Clinton River, which the National Weather Service placed under a river flood warning on July 16, 2021, forecasting a crest of 16.5 feet; residents there reported yard and home flooding again in August 2024. Macomb Township has a documented case of this: heavy rain on November 30, 2011 closed 24 Mile Road and 21 Mile Road when the north branch of the Clinton River reached 14.1 feet against a 15-foot flood stage. Novi's Grand River Avenue is known to flood near the Walled Lake branch of the Middle River Rouge.
• Water main breaks, not just storms. A water main break near 14 Mile Road in Farmington Hills flooded neighborhoods and basements and forced evacuations around 4 a.m. on March 7, 2026, with repairs taking more than 12 hours — a reminder that basement flooding isn't only a storm-season risk.
• Combined sewer systems concentrate the risk in specific districts. Royal Oak, Birmingham, and Troy are all tied to the George W. Kuhn Retention and Treatment Basin system, which overflowed roughly 2 billion gallons of combined sewage and stormwater into the Red Run during the August 2014 event. Birmingham's own fire department guidance notes the city's sewers were designed for roughly a 10-year storm, about two inches of rain an hour — well under what the 2023 and 2014 storms above actually delivered.
• Municipal infrastructure investment is a response to this pattern, not proof it's solved. Sterling Heights funded a $953,000 retrofit of the Sterling Relief Drain to capture roughly 28 million gallons of storm runoff a year, and Macomb County Public Works removed about 50 years of hardened sediment from the Vokes Relief Drain near Van Dyke Avenue to relieve a flood-prone stretch of the city — real upgrades, but ones aimed at a known, recurring risk rather than a one-time event.

See Macomb County and Oakland County for the county-wide pattern, and West Bloomfield Township, Shelby Township, and Southfield for other specific communities.

Sump pump failure: a distinct, common case

A sump pump that fails during a storm is one of the most frequent basement-flooding causes in Michigan, because pump failures cluster exactly when demand is highest — during heavy rain, which is also when power outages are most likely. Several Michigan municipalities regulate what can and can't drain through a sump line: Sterling Heights city code §24-39 bans draining groundwater, roof runoff, or footing tiles into the sanitary sewer, and requires a sump pump in new construction with basement or footing drains; footing-tile water there must go to a storm sewer where one is available. A battery or water-powered backup pump, tested before storm season rather than after a failure, is the practical fix most basement-equipped Michigan homes should have in place.

Water main breaks are a separate category, with a different response

Not every basement flood traces back to weather or a homeowner's own plumbing. A city-owned water main can fail on its own, and when it does, the response usually looks different from a storm event. On September 25, 2025, a break in a 42-inch water main closed 14 Mile Road in both directions just west of M-5 in Novi, cut water pressure across the city, and triggered a boil-water advisory that stayed in effect until September 30 — a multi-day disruption with no storm involved at all. The Farmington Hills break described above is the closer case for basement flooding specifically: water from the city's own main, not from rain or a backed-up sewer, found its way into nearby basements. Because the source is municipal infrastructure rather than a private sewer lateral, this scenario doesn't automatically fit the Public Act 222 sewer-backup claim process described in step 4, and it doesn't automatically fit a standard burst-pipe homeowners claim either, since the pipe that failed wasn't yours. If a water main break floods your basement, document it the same way as any other flood (step 3 above), and raise the specific cause — a city main, not your own plumbing — with both your insurer and your city's public works or water department, since which process applies can depend on exactly where the failure occurred relative to your property line.

Sewer backup vs. storm/surface flooding vs. supply-line failure

• Sewer backup — water (often Category 3, contaminated) enters through a floor drain or fixture because the public or private sewer line is blocked or overwhelmed. This is the scenario with the municipal 45-day claim window described above. See sewage backup: immediate safety steps.
• Storm/surface flooding — water enters from outside, through window wells, foundation cracks, or a failed sump, typically during or after heavy rain. Usually excluded from a standard homeowners policy without a flood endorsement, per Michigan DIFS.
• Supply-line or appliance failure — a burst pipe, failed water heater, or washing machine hose. Typically Category 1 or 2 water, and typically the scenario standard homeowners insurance does cover, since it's sudden and accidental. See what to do in the first hour after a pipe bursts.
• Water-main failure — a city-side infrastructure break, like the March 2026 Farmington Hills event above. Coverage here can be more complicated than a simple burst pipe, because the failure originated outside your own plumbing; this is a case worth discussing directly with your insurer rather than assuming either way.

What not to do

Don't run a shop vac on a circuit you haven't confirmed is safe. Don't assume floodwater from outside is clean; treat it as contaminated and limit contact, per Ready.gov. Don't discard wet drywall, carpet, or insulation before documenting it, even if it looks obviously ruined — your insurer, or a municipal claims reviewer under the Public Act 222 process described above, may need to see the extent of saturation before approving anything. Don't let the 45-day municipal filing clock run out while you're still dealing with the insurance side; the two processes run in parallel, not one after the other.

FAQ

How long do I have to file a claim after a basement sewer backup in Michigan?

For a municipal claim against a public sewer under Public Act 222, typically 45 days from when you discover the damage, not from when the backup happened. The exact office differs by city or county — see the list in step 4 above. Your separate homeowners insurance claim may have a different deadline; check your policy.

Is basement flooding covered by homeowners insurance in Michigan?

It depends on the source. A sudden, accidental event like a burst pipe is typically covered. Flooding from outside the home, and sewer backup without a specific endorsement, generally are not, per Michigan DIFS. See does homeowners insurance cover mold for the related mold-coverage question, and why insurers deny water damage claims.

My sump pump failed during a storm. Is that different from a sewer backup, legally?

Yes. A sump pump is private equipment on your property; its failure is generally a homeowner/insurance matter, not a municipal sewer claim, unless the failure is tied to a public system issue. A sewer backup from the public main is what triggers the Public Act 222 municipal claim process described above.

Does Michigan actually have federally declared flood disasters?

Yes — FEMA DR-4607-MI, tied to the late-June 2021 storms the National Weather Service documented hitting Metro Detroit. Check FEMA's own disaster page for which counties and assistance types currently apply, since that detail is set by FEMA and can be amended after the initial declaration. The August 2014 storm, which dropped more than 4.5 inches of rain at Detroit Metro Airport and up to 6.25 inches in nearby suburbs, is separately documented in multiple Michigan cities' own flood histories.

Is a basement flood from a city water main break handled the same as a sewer backup?

No. A sewer backup from a public main falls under the Public Act 222 municipal claim process in step 4, with its 45-day filing window. A water-main break is a different kind of municipal infrastructure failure, and it doesn't automatically fall under either that process or a standard burst-pipe insurance claim, since the failure happened outside your own plumbing. Report it to your city's public works or water department as well as your insurer, and expect the exact process to depend on where the break occurred.

Finding vetted help near you

This directory's ranked local lists — Clinton Township, Macomb Township, Rochester Hills, Novi, Troy, and Farmington Hills, among others — carry named companies, real review counts, and a published scoring method. The guides hub indexes the rest of this series, including what to do immediately after storm flooding and signs of hidden water damage if you're past the first hour and checking for damage you can't see yet — the first is part of the what-to-do-first category, the second part of identifying-damage.