July 2023: When the West Side Went Under
Between June 29 and July 2, 2023, storms dropped up to 8 inches of rain on parts of Cook County in under two hours, and Chicago's West Side took the worst of it. Austin basements filled block after block. The damage was severe enough that on August 15, 2023, the federal government issued disaster declaration DR-4728-IL, opening Individual Assistance to Cook County residents.
For many Austin families that event was not a first flood — it was the biggest in a series. Cloudburst flooding has hit this part of the West Side repeatedly, because no combined sewer anywhere can swallow that much rain that fast. The system sends what it cannot carry back up floor drains, and the lowest rooms on the block take the overflow.
The lesson of 2023 is speed. Households that got water out and air moving within a day saved basements; those that waited a week fought mold all summer. Keep the first 24 hours checklist somewhere you can find it during a blackout.
Why Cloudbursts Beat the Sewers Here
Chicago's combined system routes stormwater and sewage through the same pipes toward treatment, with the Deep Tunnel network — 109 miles of tunnels feeding reservoirs — catching overflow. The system moves enormous volume, and it is still growing: the McCook reservoir's second stage, due in 2029, will lift total capacity to 17.5 billion gallons.
But a cloudburst is a local, violent event. Eight inches in two hours overwhelms the local mains long before the water ever reaches a tunnel. On Austin's long residential blocks, that means simultaneous backups in dozens of basements at once — which is also why every restoration crew in the region books solid in the days after a big storm. Calling early matters; we connect you with an independent contractor and get you into their queue rather than at the back of it.
Scale compounds the problem. Austin is one of Chicago's largest community areas by population, stretching from roughly Roosevelt Road north past North Avenue along the Oak Park border. When a storm cell parks over that much rooftop and pavement at once, the volume arriving at the sewers in the first half hour is staggering — and it all has to go somewhere.
Floodwater in a basement after a storm is Category 3 — treat it like sewage even if it looks like rain. Skin contact, and especially cuts, are the real hazard.
Frame Two-Flats and Greystones After a Flood
Austin's housing is dominated by large frame two-flats and handsome greystones, much of it built in the early 1900s when this was one of the city's fastest-growing areas. Both types have specific post-flood vulnerabilities.
Frame two-flats carry their structure in wood from sill to ridge. Floodwater wets the sill plate and the bottoms of studs; if those members are boxed in and repainted while damp, rot works quietly for years. Greystones resist water better at the walls — limestone and brick shrug off wetting — but their basements often hide old wood partitions, paneling, and layers of past finishing that soak up contaminated water and have to come out.
In either building, the sequence is the same: extraction first, removal of what cannot be sanitized, then monitored structural drying down to the framing. One more caution for this housing stock: most of it predates 1978, so any firm disturbing painted surfaces during demolition must be EPA Lead-Safe certified.
What DR-4728 Taught Austin About Paperwork
The 2023 federal declaration brought Individual Assistance to Cook County — help for households whose losses were not covered by insurance. Thousands of Austin residents went through that process, and the ones who fared best had the same three things: photos taken before cleanup, receipts for everything, and a written scope from whoever did the work.
That standard is worth keeping for every future loss, federal declaration or not. Insurers ask for the same documentation, and the difference between a smooth claim and a fight is usually the record you built in the first two days. Remember also that standard homeowners policies generally exclude sewer backup unless a water backup endorsement was added — a detail covered in the insurance claims guide, and the single most important policy check a West Side homeowner can make before the next storm.
The independent crews we work with document as they go: moisture logs, photos, and itemized scopes that hold up with adjusters and assistance programs alike.
Nearby neighborhoods
Water behaves much the same on the surrounding blocks, and the same combined sewer serves them. If you are closer to Portage Park, Wicker Park & Bucktown and Chatham, start there instead — each page covers the housing stock and the failure modes specific to that neighborhood.
Frequently asked questions
Another big storm is forecast. What can I do tonight?
Move irreplaceable items and electronics off the basement floor, clear the area around the floor drain, test that your sump pump runs, and charge your phone. If water arrives, safety order is power first, then photos, then cleanup.
My basement flooded in 2023 and was never professionally dried. Is it too late?
It is not too late to assess. If the basement smells musty or framing shows staining, ask for a moisture and mold inspection. Long-damp framing and hidden mold are fixable, but they need remediation rather than repainting.
Does a federal disaster declaration mean the government pays for my cleanup?
Not automatically. Individual Assistance, when activated as it was under DR-4728, helps with uninsured losses after registration and inspection. Insurance remains the first layer, which is why the water backup endorsement matters so much here.
Is street flooding water different from a sewer backup?
By the time it reaches your basement, no. Rising floodwater is classified Category 3 under the IICRC S500 standard, same as a backup, because it carries whatever the streets and sewers carried. Both call for contaminated-water cleanup protocols.
Sources
The facts on this page are checked against these primary sources. If you find something that has gone stale, tell us and we will correct it.
- Metropolitan Water Reclamation District of Greater Chicago — Tunnel and Reservoir Plan (TARP)
- FEMA — Illinois Severe Storms and Flooding (DR-4728-IL)
- EPA — Renovation, Repair and Painting (RRP) Program
- IICRC — ANSI/IICRC standards (S500 water damage, S520 mold)
- Insurance Information Institute — flood damage and water backup coverage
Related pages
Chatham Basement Backup and Water Damage Cleanup
Read more →
Storm and Flood Damage Restoration in Chicago
Read more →
The First 24 Hours After Water Damage: A Chicago Homeowner’s Checklist
Read more →
Need a crew in your neighborhood?
Talk to an independent restoration pro serving Chicago — the line is answered around the clock.
Call (312) 555-0113 Now