About two-thirds of Derwood's homes went up in the 1980s, so their drain lines are old enough to carry decades of grease and soap buildup but usually not old enough to be failing. A plumber clears the line and tells you whether the clog was in a branch or the main. Call the number on this page to be connected with a local plumber in Derwood.

Derwood is a suburban community just north of Rockville and southeast of Gaithersburg, near the Shady Grove Metro, about 16 miles from downtown Washington. The median home was built in 1985. WSSC Water collects the sewage, and most WSSC sewage from Montgomery County is treated at DC Water's Blue Plains plant. For public-side emergencies, WSSC Water's Emergency Service Center is 301-206-4002. Most homes here have plastic drain lines, so a clog is usually about what went down the pipe: grease from the kitchen, wipes and paper in the toilets, and hair and soap in the baths. Lines of this age can also carry a thick layer of film on their walls, which narrows them until an ordinary load gets stuck.
What to do right away
- Stop the flow. Pause the washer, dishwasher and showers until the drains move again.
- Isolate the problem. Run water in one fixture at a time. If only one is slow, the clog is local.
- Watch the basement. Water coming up through a floor drain means the main is blocked.
- Plunge carefully. A flange plunger can clear a toilet; do not plunge a sink that shares a line with a backed-up tub.
- Look outside. If neighbors have the same problem or a manhole is overflowing, call WSSC Water.
Symptoms and what they usually mean
| Symptom | Likely cause |
|---|---|
| Bathroom sink slow, tub fine | Hair and toothpaste in the sink trap |
| Kitchen sink backs into the other bowl | Grease and food in the kitchen branch |
| Toilet gurgles during laundry | Partial main line clog downstream |
| Floor drain wet after showers upstairs | Main drain or building sewer blocked |
| Drains slow on very cold mornings | A frosted roof vent |
What affects the cost
Depth and access drive most of it. A trap clog is quick, while a building sewer plugged out toward the street needs a bigger machine. In a finished basement, a cleanout behind drywall or shelving adds time. Lines from the 1980s with heavy grease and soap film may call for water jetting rather than a cable, priced separately. If a camera shows a break or a belly, the repair needs a WSSC Water permit and a plumber holding a WSSC license. After-hours calls usually cost more than a weekday visit.
Drain Cleaning questions in Derwood
When is hydro jetting a better choice than a cable machine?
Can freezing weather cause slow drains?
Why does the basement floor drain back up before anything else?
Are wipes sold as flushable safe for the sewer line?
More plumbing services in Derwood
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