Somerville Floor Drain Backups: Drying What Can Be Saved
If it came up the drain we categorize the water first, because that answer decides what dries and what leaves the building.
Water Damage Drying quote in Somerville
Tell us what you can see, where the water came from, and whether anything is still wet. That is usually enough for us to say which trade you need, and whether the job is small enough to handle yourself, before anyone comes out.
Would you rather talk it through? Call (315) 640-3590, answered 24/7.
$100 off your first job
Credited by us on your first booked job.
- One credit per customer per property, on your first booked job.
- Valid through December 31, 2026.
Mention this offer when you book. Full terms.
Why Somerville water arrives from underneath
A hard rain in Somerville does not usually push water through a foundation wall. It pushes it up the cellar floor drain, because one pipe is carrying the sewage and the storm flow together and the relief structures on that pipe exist to send the excess to a water body instead of into buildings and manholes. When the relief is not enough, the pressure finds the nearest opening indoors, and there are six remaining combined sewer overflow outfalls on the Alewife Brook alone. Water that has been in a combined line is not rainwater, so drying is only half the work: the porous material it soaked comes out, the hard surfaces get cleaned, and readings rather than a hand on the surface decide when the framing is dry.
What water damage drying involves in Somerville
Two decisions while the cellar is still wet
Two decisions sit in front of you while the water is still down there, and the cheap one is the second. First the clock: material dried within 24 to 48 hours of a leak or spill will in most cases not grow mold, and the housing code puts the owner's deadline at 48 hours from the leak or the end of the event, whichever is sooner. Neither of those numbers waits for an insurance answer. Second the fix: where the pressure comes from the combined line, a backwater valve is what stops the next one and a bigger sump pump is not. Ask about the valve while the floor is already open and the cost of asking is nothing.
Which category the water is
Combined line water is handled as contaminated, which moves carpet, pad, batt and the lower board from the drying list to the removal list.
The 48 hours, and who it runs against
The deadline runs to the owner from notification or the end of the event, whichever is sooner. In a rented three-decker that means the message reporting it starts the clock.
A valve or a pump
A pump moves water that is already inside. A backwater valve stops the combined line pushing it in. They solve different problems and only one of them is yours.
The outfalls that relieve Somerville's combined line
The April 2025 Alewife Brook joint press release records six remaining combined sewer overflow outfalls along the Alewife Brook permitted to the MWRA and the Cities of Cambridge and Somerville, and states that water quality in the Alewife Brook during both wet and dry weather generally fails to meet state bacteria standards for fishing and swimming.
Source: City of Cambridge, Massachusetts Water Resources Authority and City of Somerville, accessed 2026-09-14
The Alewife Brook release records that the MWRA communities with permitted combined sewer overflow outfalls are Boston, Cambridge, Chelsea and Somerville, that 35 projects in the court-ordered Long-Term CSO Control Plan have been completed, and that region-wide annual CSO discharge volume has fallen 88 percent in an average year.
Source: City of Cambridge, Massachusetts Water Resources Authority and City of Somerville, accessed 2026-09-14
The EPA puts the onset of mold growth on wet or damp material at 24 to 48 hours after a leak or spill, so material brought dry inside that window will in most cases not grow mold at all.
Source: U.S. Environmental Protection Agency, accessed 2026-09-14
105 CMR 410.500(B) states that in the event of leaks and flooding the owner shall ensure all surfaces have been dried within 48 hours from the time they are notified or the end of the event, whichever is sooner.
Source: Massachusetts Department of Public Health, via Cornell Legal Information Institute, accessed 2026-09-14
Came up the drain again?
Tell us how high it got and we will move on extraction first.
Testing and removal after a Somerville backup
What Somerville callers ask after a heavy rain
Is water from the floor drain sewage?
In a combined system the same pipe carries both, so it has to be handled as though it is. That means extraction before air movers, hard surfaces cleaned, and anything porous it soaked carried out rather than dried. It also means gloves and boots for whoever is down there, including you.
Would a bigger sump pump stop this happening again?
Not if the water is coming up the drain. A pump discharges water that has already arrived. Where the pressure is in the combined line, the device that keeps it out is a backwater valve on the drain, and the time to fit one is while the floor is already exposed.
Tell us what the drain did
We will say what can be dried and what has to be carried out.