What matters for project planning
The City of Warren's Rain Preparedness and Response guidance explains that the city's underground sewer infrastructure was built around a roughly two-inch-rainfall standard, and that footing drains tied into sanitary sewers are a documented, ongoing cause of basement flooding when heavier storms exceed that capacity. Warren's flood records date back to at least 1974, and the Red Run Drain -- a tributary of the Clinton River -- carries overflow from the city's retention system, including the $37.5 million, 22-million-gallon detention basin the city opened in February 2025 specifically to reduce basement flooding and sewage discharges.
Official sources
Verify the property, not just the city
Citywide context cannot establish a parcel's flood zone, historic designation, permit requirements, soil conditions, or concealed construction. Confirm those items with the appropriate authority and selected provider before work begins.
Sources reviewed 2026-07-26. External requirements and maps can change.