Who bears Detroit's basement-flood burden
Detroit's basement backups are not spread evenly. They fall hardest on the city's oldest, predominantly Black, lower-income neighborhoods, by nearly a factor of three.
The flooding Detroiters live with is mostly invisible until a storm. To see where it lands, we counted the City of Detroit's own water-in-basement complaints (its 311 "Water In Basement Investigation" requests, 13,433 of them since 2023) and turned them into a rate per 1,000 occupied homes for every Detroit ZIP code, using Census housing counts. Then we lined that rate up against each ZIP's income and racial makeup. The pattern is clear, and it is not subtle.
What the data shows
Grouping Detroit's 28 residential ZIP codes into thirds by share of Black residents, the basement-backup rate climbs steadily as the Black share rises:
The income gradient runs the same direction: the lowest-income third of ZIPs reports 56.8 backups per 1,000 homes, the middle third 49.2, and the highest-income third 36.7. The single hardest-hit ZIPs, 48213, 48238, 48204, 48227, and 48205 on the east and west sides, are all 89 to 96 percent Black with median incomes in the low thirty-thousands.
The full picture, ZIP by ZIP
| ZIP | Rate /1,000 homes | Median income | % Black |
|---|---|---|---|
| 48211 | 117.2 | $35,078 | 40% |
| 48213 | 96.7 | $33,659 | 95% |
| 48238 | 82.3 | $29,692 | 93% |
| 48204 | 78.7 | $29,224 | 89% |
| 48205 | 76.7 | $42,671 | 94% |
| 48227 | 69.3 | $33,579 | 96% |
| 48224 | 67.2 | $41,011 | 89% |
| 48228 | 57.2 | $33,229 | 74% |
| 48206 | 56.9 | $36,641 | 85% |
| 48235 | 55.9 | $38,901 | 95% |
| 48234 | 53.0 | $35,667 | 95% |
| 48219 | 49.7 | $41,312 | 88% |
| 48215 | 47.9 | $32,873 | 89% |
| 48203 | 43.1 | $34,610 | 87% |
| 48210 | 41.9 | $36,073 | 19% |
| 48221 | 40.5 | $51,181 | 87% |
| 48223 | 39.5 | $41,587 | 88% |
| 48217 | 38.5 | $45,870 | 83% |
| 48208 | 34.9 | $24,046 | 68% |
| 48214 | 34.1 | $31,833 | 80% |
| 48202 | 29.4 | $34,244 | 62% |
| 48209 | 29.0 | $37,222 | 6% |
| 48212 | 25.3 | $37,309 | 21% |
| 48216 | 21.8 | $41,066 | 37% |
| 48207 | 13.6 | $43,960 | 76% |
| 48226 | 12.5 | $71,875 | 45% |
| 48239 | 6.0 | $67,570 | 57% |
| 48201 | 4.2 | $22,243 | 62% |
The full 28-ZIP table with renter share and exact counts is available on request. The lowest-rate ZIPs are the higher-income or newly-built ones (downtown, 48239, Midtown); the highest are the older, predominantly Black east and west sides.
Why the burden is uneven
The cause is structural, not a matter of who is more careful. Basements that flood in Detroit are mostly old basements: built before sump pumps, exterior weeping tile, and backwater valves were standard, on heavy clay soil, served by aging combined sewers that carry storm and sewage in the same pipe. That housing stock is concentrated where it has always been, in the neighborhoods that decades of redlining and disinvestment left with the oldest infrastructure. Race and income here are tracking that history; they are not the cause of the water. The result is that the cost lands on Detroit's Black homeowners, the families who stayed and invested in those homes.
How strong is the pattern
We want to be straight about the strength of the finding. Across the 28 ZIPs, the correlation between basement-backup rate and share Black is moderate (about +0.38), and with median income about -0.35. These are real, consistent relationships, not noise, but they are gradients, not absolutes: housing age, soil, and local sewer condition also matter, which is why a few ZIPs do not fit the line. This is a neighborhood-level pattern from public records, not a claim about any individual home. The data and method are fully reproducible from the sources below.
See your own neighborhood
Look up any metro Detroit community on the interactive Basement Risk Index map.
Open the map →Method and sources
Flood measure: City of Detroit Improve Detroit / Department of Public Works 311 "Water In Basement Investigation" reports, 2023 to present, counted by ZIP and divided by occupied housing units. Demographics: U.S. Census Bureau, American Community Survey 2022 5-year estimates (median household income, share Black, occupied and renter-occupied housing units), by ZIP code tabulation area. Data pulled June 2026 and free to cite. For the underlying community index, see our 2026 findings and published methodology; look up any community on the risk map or the full ranking.
- City of Detroit Improve Detroit / 311 open data (request type "Water In Basement Investigation").
- U.S. Census Bureau, ACS 2022 5-year estimates (tables B19013, B01003, B02001, B25003), by ZCTA.