About two-thirds of Derwood's homes were built in the 1980s, so a large share of the community has copper supply lines of the same age, and those lines are starting to show wear. When leaks keep recurring, a repipe usually costs less in the long run than repeated patching. Call the number on this page to be connected with a local plumber in Derwood.
A quick look at Derwood
Derwood is an unincorporated community just north of Rockville and southeast of Gaithersburg, near the Shady Grove Metro and Lake Needwood. Its median home was built in 1985, and only about 15 percent of homes predate 1980. WSSC Water provides public water and sewer here. Because so many houses were built at the same time, neighbors often see pipe trouble around the same time too.
What to do now
- Find and test the main valve. It's usually near where the service line enters the basement or utility room.
- Check the exposed pipe. Copper with green spots at joints suggests slow seepage. Gray plastic with crimp rings points to an older plastic system that's no longer installed.
- Know your share of the service line. WSSC is responsible from the main to the property line; you're responsible from the property line into the house.
- Map past leaks. A quick list of rooms and dates shows whether failures are spread out or concentrated.
- Check irrigation. If you have an in-ground sprinkler system, its backflow assembly needs an annual test by a WSSC-certified cross-connection technician, and a repipe must keep it connected correctly.
Common symptoms
| Symptom | Likely cause |
|---|---|
| Second or third pinhole leak in a few years | Original copper thinning throughout |
| Leak at a fitting under a sink | A single joint failure; usually a repair |
| Flow drop in one bathroom | A failing valve or a branch problem |
| Hissing behind a wall after taps close | A pinhole leak under pressure |
| Higher water bills with no visible leak | A hidden leak in a wall, ceiling or buried line |
Cost factors
- Single-family home or townhouse, and how many levels
- Bathrooms and fixtures to reconnect
- Finished basements and ceilings
- PEX or copper
- Patching, paint and permit through WSSC Water
- Whether the customer-owned part of the service line is replaced at the same time
Since many Derwood houses in neighborhoods such as Mill Creek Towne and Needwood Estates were built around the same time with similar layouts, a plumber familiar with the area can often predict where lines run and quote with fewer surprises. Ask whether wall patching and paint are in the price or left for you to arrange, and how long water will be off each day. Plumbing permits come from WSSC Water, and the work has to be done by a plumber registered with WSSC Water.
Repiping questions in Derwood
What supply pipe is probably inside a house built when mine was?
Is replacing only part of the plumbing ever enough?
How much wall and ceiling has to be opened?
Doesn't the utility treat the water to protect older pipes?
More plumbing services in Derwood
Repiping nearby
Sources
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