Most Potomac homes drain to WSSC Water's public sewer, but some properties are on private onsite wastewater systems, and that changes what a backup means. A plumber clears the house drains either way and helps you tell a clog from a system that needs service. Call the number on this page to be connected with a local plumber in Potomac.
Potomac grew from farmland into an affluent suburb about 12 miles from downtown Washington, centered on Potomac Village where Falls Road meets River Road. The median home was built in 1977, and older farmhouses still stand among the subdivisions. Montgomery County assigns every property a water and sewer service category, and some are planned for private wells and onsite systems rather than public service. If you are not sure which applies to your home, your utility bill or the County's category map answers it.
What to do now
- Cut back on water use. Hold the laundry and dishwasher until drains run freely again.
- Check how widespread it is. One slow sink is a local clog. Every fixture slowing at once points to the main drain, or on a private system, possibly the tank.
- Find the cleanout. In a basement it is usually a capped pipe near the wall the sewer leaves through. Larger homes may have more than one.
- Do not pour in chemicals. They rarely reach a main line clog and they can harm the bacteria a private system depends on.
- Call the right party. For public sewer problems, WSSC Water's Emergency Service Center is 301-206-4002. On a private system, the owner arranges both the plumbing and the system service.
Symptoms and likely causes
| Symptom | Likely cause |
|---|---|
| One bathroom slow, the rest normal | Hair and soap in that branch line |
| Basement floor drain rising during laundry | Blocked main drain or building sewer |
| All drains slow, wet patch in the yard | On a private system, a full or failing tank or field |
| Recurring main line clog | Roots entering joints in an older line |
| Gurgling across several fixtures | A partial blockage downstream or a blocked vent |
Cost factors
Long building sewers on large lots take more cable and more time than a short run to the street. Mature trees around older homes add root cutting to many main line calls, and a camera look is often worth it to see how much pipe is affected. Access matters: a cleanout in a finished lower level, or none at all, adds work. Where the house is on a private system, the plumber may clear the line to the tank and recommend separate service for the system itself. Night and weekend calls usually cost more. Any repair to a water or sewer service line goes through WSSC Water and must be done by a plumber holding a WSSC license.
Drain Cleaning questions in Potomac
My home is not on public sewer. Can a plumber still clear the drains?
Can tree roots work their way into an older sewer line?
Where would the cleanout be in a house with a basement?
Is a camera inspection worth it after a main line backup?
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