Sewer Backup and Basement Protection in Jamesville
Everything sewered in this hamlet leaves through one pumped facility, and the county models it at the highest structure damage of any wastewater facility in the DeWitt annex.
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One pumped outlet, and what a Jamesville basement should expect
Jamesville's sanitary flow leaves through a single county facility, the Jamesville Pump Station at 6660 East Seneca Turnpike, which the county's own hazard modeling places in both the 100 year and the 500 year flood with modeled structure damage of 38.0 percent, the highest of any wastewater facility named in the Town of DeWitt annex. Read that as an outlet that can become unavailable rather than merely slow. A house whose lowest fixture sits below the level of the street sewer is where that shows up, and that is the specific case a backwater valve exists for rather than a general precaution.
What sewer backup involves
Whether to protect a Jamesville basement, and what it costs you
Weigh the elevations, because the code settles the question without anybody's opinion. Section P3008.1 requires a backwater valve where the flood level rim of a fixture sits below the cover of the next upstream manhole in the public sewer, in the building drain, a branch of it, or the horizontal branch serving that fixture, and section P3008.4 requires the working parts to stay accessible. Then weigh the trade-off the county is explicit about and most quotes are not: while a valve is holding back a surcharge it is also stopping flow leaving the house, so it comes with a household rule during an event and a cleaning schedule for the rest of the year.
One outlet means one point of failure
The Jamesville Pump Station is modeled at 38.0 percent structure damage in both the 100 and 500 year flood, the highest in the DeWitt annex. That is a documented reason to plan rather than a hypothetical one.
The code decides, not the salesperson
Lowest fixture rim below the next upstream manhole cover means a valve is called for. Above it, it is not, and that is worth checking before agreeing to anything.
A valve is a device with a duty attached
It has to stay accessible, be inspected and cleaned regularly, and while it is closed nothing leaves the house either. Anyone fitting one should be explaining that.
6660 East Seneca Turnpike, and the code test for a valve
The Town of DeWitt annex to the 2025 county hazard mitigation plan lists the Jamesville Pump Station, owned by Onondaga County Water Environment Protection, at 6660 East Seneca Turnpike, Jamesville, as exposed to both the 100 year and the 500 year flood, with modeled structure damage of 38.0 percent. That is the highest modeled structure damage of any wastewater facility named in the DeWitt annex.
Source: Onondaga County 2025 Multi-Jurisdictional Hazard Mitigation Plan, accessed 2026-09-08
Section P3008.1 of the New York residential code requires that where the flood level rims of plumbing fixtures sit below the elevation of the manhole cover of the next upstream manhole in the public sewer, those fixtures shall be protected by a backwater valve installed in the building drain, a branch of it, or the horizontal branch serving them. Section P3008.2 requires the valve to be of the normally open type where fixtures sit above that elevation, and section P3008.4 requires that the valve be installed so its working parts stay accessible.
Source: 2020 Residential Code of New York State, Section P3008, via UpCodes, 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
Is your basement below the street sewer?
Tell us and we will say whether the code expects a valve there, and what living with one involves.
Other backup and drain work we arrange in Jamesville
What Jamesville owners ask about backups and protection
Why is the Jamesville pump station a concern for my basement?
Because it is the outlet. The county's hazard modeling puts the Jamesville Pump Station at 6660 East Seneca Turnpike in both the 100 year and 500 year floodplain with modeled structure damage of 38.0 percent, the highest of any wastewater facility named in the DeWitt annex. A station out of service does not send water to your house, it takes away where your house sends water.
What is the downside of fitting a backwater valve here?
Two things, and neither is a reason not to fit one where the code calls for it. The county states plainly that while a valve is holding back a surcharge it is also stopping flow from leaving the house, so the household has to know not to run water during an event. And a valve has to be inspected and cleaned regularly, which is why the code requires the working parts to remain accessible.
Tell us what is happening below ground in Jamesville
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