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Basement Risk Index™ · Community Report

Basement Flood Risk in Lyon Township, Michigan

Lyon Township’s Basement Risk Index is 1/100 (LOWER). 7% of homes here were built before 1960 (U.S. Census ACS 2020-2024, updated Jul 2026), the biggest driver of basement-flooding risk in this region.

Water in your basement in Lyon Township right now?

  1. Don’t enter standing water if the power is on. Cut it at the breaker only from a dry spot, or call an electrician.
  2. Photograph and video everything before you move or clean up anything, insurance and city claims both turn on this.
  3. Michigan law gives you about 45 days from discovery to file a written damage claim with your sewer authority. Start today.
  4. Once it is safe, call a licensed waterproofing contractor. Do not wait for it to dry on its own.
1BRI / 100
LOWER RISK
Ranked #115 of 116 metro Detroit communities

Data confidence: C, modeled from housing-age measures; no local flood records integrated yet. How the score is built →

Lyon Township, Michigan carries a Basement Risk Index of 1 out of 100, ranking #115 of 116 communities across metro Detroit, which is below the metro Detroit average. The score is driven by housing age and soil: 7% of Lyon Township homes were built before 1960, the era before sump pumps, exterior weeping tile, and backwater valves were standard, and the region's heavy clay soil holds water against those older foundations.

Lyon Township basement risk at a glance

Basement Risk Index1 / 100 (LOWER)
Metro rank#115 of 116
Homes built before 19607%
Peak building era2010s (33% of homes)
Median year built2003
Median home value$473,300
Median household income$146,354
Owner-occupied89%
Neighborhoods analyzed4

Lyon Township's score is modeled from U.S. Census housing data; no municipal flood records are integrated yet. The Basement Risk Index is built from U.S. Census housing data and documented flood records. See our full methodology.

When Lyon Township was built

The housing stock in Lyon Township peaked in the 2010s, when about 33% of today's homes were built. In total, 7% of Lyon Township homes predate 1960. That matters because basements built before the 1960s typically lack the sump pumps, perimeter drain tile, and backwater valves that became standard later, leaving many on their original, aging clay drain tiles.

2020 or later
6%
2010s
33%
2000s
15%
1990s
18%
1980s
8%
1970s
9%
1960s
4%
1950s
4%
1940s
1%
Before 1940
1%

How basement risk varies inside Lyon Township

We score 4 individual neighborhoods inside Lyon Township. Of those, 0 fall in the high or very high band, 0 are elevated, and 4 are moderate or lower. Risk is rarely uniform across a city, so the most useful number is the one for your own block.

0Very High
0High
0Elevated
0Moderate
4Lower

What this means for Lyon Township homeowners

Lyon Township scores toward the lower end of the metro range, largely because of its newer housing. Risk is still real on clay soil, so watch for symptoms after heavy rain.

Why Lyon Township homes face basement risk

Basement flooding in Lyon Township is mostly a function of housing age and soil. Older homes were built with clay drain tiles that crack and clog over decades, and the dense clay across southeast Michigan holds water against foundations rather than letting it drain.

How Lyon Township compares

Lyon Township's Index of 1 is below the metro Detroit median of 37. It ranks #115 of 116 communities region-wide.

Does insurance cover it?

Often not. Standard Michigan homeowners policies commonly exclude sewer backup and groundwater unless you carry a specific endorsement. Before the next storm, it is worth reading our guide on whether insurance covers basement flooding in Michigan and checking your declarations page.

What to do about it

  1. Lower risk is not zero risk on the region's clay soil, a free prevention check takes about 30 minutes.
  2. Watch for symptoms after storms; what you see at your own home matters more than any average.
  3. Maintain gutters and grading, the two cheapest protections any Michigan home has.

Hiring in Lyon Township?

We keep public-record profiles of metro Detroit basement waterproofing contractors, drawn from their own listings and Michigan licensing records. No ratings and no pay-to-play, just the record. Browse the contractor records →

See Lyon Township on the full metro Detroit Basement Risk Index map →

Concerned about this score?

We connect Lyon Township homeowners with one licensed, insured basement waterproofing contractor for a free, no-obligation assessment. Your information goes to one local pro, never to lead lists.

Request your free assessment →

See Lyon Township on the interactive metro map →
Read the published methodology →
Browse all 116 communities ranked →

Nearby communities

South Lyon · 10Novi · 5Milford Township · 20Wixom · 12Northville · 43

Homeowner guides

Does insurance cover basement flooding?What to do when your basement floodsWhat waterproofing costs in metro DetroitHow to choose a waterproofing contractorSump pump costs in MichiganBackwater valves: cost and who needs oneThe 2021 metro Detroit floodsWhat keeps a Michigan basement dry

Frequently asked questions

Is Lyon Township at high risk for basement flooding?

Lyon Township scores 1 out of 100 on the Basement Risk Index, ranking #115 of 116 metro Detroit communities (LOWER risk). The score reflects how much of the local housing stock predates modern basement drainage, on the region's clay soil.

Why does housing age matter so much in Lyon Township?

Sump pumps, exterior weeping tile, and backwater valves only became standard in the 1960s and 70s. 7% of Lyon Township homes were built before 1960, with the largest share built in the 2010s. Many still rely on original clay drain tiles that fail over time.

Does homeowners insurance cover basement flooding?

Often not. Standard policies commonly exclude groundwater and sewer backup unless you carry a specific rider. See our Michigan insurance guide.

Is this resource free to use?

Yes. The Basement Risk Index and every community report are free and public, with no signup and no login.