Grading, Gutters, and Sump Pumps in Southeast Michigan Homes: What Inspectors Check Before Water Finds Its Way In

Southeast Michigan doesn't lack for water. Between spring downpours, melting snow, and the flat, clay-heavy soil found throughout Wayne, Oakland, and Macomb counties, managing where water goes around a home is just as important as any other system inside it. Yet drainage is often the most overlooked part of a property until a basement floods or a sump pump fails at the worst possible time.

During a home inspection, we spend time outside looking at how a property handles water before it ever gets close to the foundation. Here's what that review typically covers.

Grading and Lot Slope

Ideally, the ground around a home should slope gently away from the foundation in every direction. In many older Metro Detroit neighborhoods, decades of settling, landscaping changes, and added patios or walkways have flattened or reversed that slope. When soil slopes toward the house instead of away from it, water collects right where you don't want it — against the foundation wall.

• Low spots near the foundation that pond water after rain
• Mulch or soil piled too high against siding, which traps moisture and invites pests
• Hardscaping like patios or driveways that direct runoff toward the house instead of away from it

Gutters and Downspouts

A home's gutter system is the first line of defense against foundation and basement water issues, but it only works if it's intact, clean, and directing water far enough away from the house.

• Clogged or sagging gutters that overflow directly along the foundation line
• Downspouts that dump water within a few feet of the house instead of extending it away
• Disconnected or crushed extensions, often hidden under landscaping or mulch beds
• Missing splash blocks that allow water to erode soil right at the foundation

In many Detroit-area homes built decades ago, downspouts were tied directly into the sewer system. That setup isn't typically allowed on new installations today and can contribute to backups during heavy storms, so it's worth knowing whether a property still has this configuration.

Sump Pumps and Interior Drainage

For homes with basements — the vast majority in this region — a functioning sump pump is often the difference between a dry basement and a costly cleanup.

• Pump operation, checked by adding water to the pit to confirm the float switch engages properly
• Discharge line routing, making sure water is carried well away from the foundation rather than looping back toward it
• Battery backup systems, especially important given how often summer storms knock out power right when pumps are needed most
• Age and condition of the pump, since most units have a limited service life

Why This Matters Before You Buy or List

Drainage problems rarely show up as a single dramatic event. More often, they're a slow pattern — a damp basement smell, efflorescence on block walls, or a sump pump that runs constantly during wet seasons. Catching these clues early, whether you're buying, selling, or simply maintaining your home, can prevent far more expensive foundation or mold-related repairs down the road.

A full inspection looks at grading, gutters, and sump systems together, since they all work as one line of defense against the same problem: water finding its way somewhere it shouldn't be.

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