Sewer Backup and Basement Flooding Across DeWitt
Get the line open, then check your address against a list the town has already published, because five areas here flood consistently and that changes what caused your wet basement.
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Five DeWitt areas already on the town's own flood list
After the house is draining again, the question worth answering is whether this was your pipe or your location. The Town of DeWitt annex to the county hazard plan names five areas consistently affected by flooding: Franklin Park, the north branch of Ley Creek, Teal Brook, the eastern branch of Ley Creek, and the convergence of Ley Creek and Teal Brook. It also lists three county wastewater pump stations in the town exposed to the 100 and 500 year floodplains, at Butternut Drive, Manlius Townline Road and East Seneca Turnpike. If your address is near one of those, a wet basement has an explanation that starts outside your property line.
What sewer backup involves
Weather, water and what a DeWitt backup is telling you
Weigh the event against the rainfall record. Syracuse receives 38.47 inches of precipitation a year across 173.6 days with at least a hundredth of an inch, but only 22.7 days with half an inch or more and 5.3 days with an inch or more. A basement that fails on the heaviest handful of days each year is behaving like a capacity problem. A basement that fails on an ordinary week is behaving like a blockage, and that one will keep happening until the line is dealt with. Then work the county's prevention list in order, because it runs cheapest first: grease and wipes out, wrong connections found, floor drain protected, valve last.
Check the address against the town's five areas
Franklin Park, the north and eastern branches of Ley Creek, Teal Brook and the point where Ley Creek and Teal Brook converge are already recorded as consistently affected. That is context you get for free.
Count the heavy days, not the wet days
Only 5.3 days a year here deliver an inch or more of rain. If your basement only fails on those, you are dealing with volume and not with an obstruction.
Do the free checks before the paid ones
Keeping grease and wipes out, finding a sump pump or roof drain wrongly connected to the sanitary sewer, and plugging or fitting a one-way device to a floor drain all sit ahead of a valve on the county's own list.
Franklin Park, Ley Creek, Teal Brook and the rainfall record
The Town of DeWitt annex to the 2025 county hazard mitigation plan names five areas consistently affected by flooding: Franklin Park, the north branch of Ley Creek, Teal Brook, the eastern branch of Ley Creek, and the convergence of Ley Creek and Teal Brook. The same annex lists three county wastewater pump stations in the Town exposed to the 100 and 500 year floodplains: Butternut Drive I at 5960 Butternut Drive, Fremont at 6125 Manlius Townline Road and Jamesville at 6660 East Seneca Turnpike.
Source: Onondaga County 2025 Multi-Jurisdictional Hazard Mitigation Plan, accessed 2026-09-08
Under the NOAA 1991 to 2020 climate normals, Syracuse receives 38.47 inches of precipitation a year at Hancock International Airport, on 173.6 days with at least a hundredth of an inch, 89.7 days with at least a tenth of an inch, 22.7 days with half an inch or more and 5.3 days with an inch or more.
Source: NOAA National Centers for Environmental Information, accessed 2026-09-08
WEP names three causes of basement backups: blockages in the sewer line, inflow during heavy rainfall overwhelming the sewer system, and tree roots infiltrating sewer pipes. Its published prevention steps are to keep fats, oils, grease and wipes out of the drain, to check for sump pumps, roof drains and gutters wrongly connected to the sanitary sewer, to eliminate or redirect an unneeded basement sewer connection, to plug or fit a one-way device to a basement floor drain that connects to the sanitary sewer, and to have a licensed plumber install a backwater valve, which must be inspected and cleaned regularly. The department warns that while a backwater valve is holding back a surcharge it is also stopping flow from leaving the house.
Source: Onondaga County Department of Water Environment Protection, accessed 2026-09-08
Ordinary week, or the worst storm of the year?
Tell us when it happened and we will say whether this is a blockage or a volume problem.
Other basement and drain work we arrange in DeWitt
What DeWitt owners ask after the basement takes water
Is my part of DeWitt known for flooding?
The town has published the answer. Its annex to the county hazard plan names Franklin Park, the north branch of Ley Creek, Teal Brook, the eastern branch of Ley Creek and the convergence of Ley Creek and Teal Brook as consistently affected by flooding. It also lists three county wastewater pump stations in the town that sit in the 100 and 500 year floodplains.
How often does DeWitt actually get rain heavy enough to overwhelm a sewer?
Less often than it feels. The NOAA normals for Syracuse record 173.6 days a year with measurable precipitation but only 22.7 with half an inch or more and 5.3 with an inch or more. That distinction is genuinely useful: if your basement only takes water on the handful of heaviest days, cleaning a clear line will not change anything.
Tell us what came up in your DeWitt basement
Send your ZIP code and what you saw. Phones are answered 24/7 and there is no obligation.