Clarksburg is a fast-growing, unincorporated part of upper Montgomery County where most homes are less than 25 years old and WSSC Water supplies water and sewer. WSSC also permits and inspects plumbing and gas work. Plumber Washington DC Pros is a free referral line, not a plumbing company. Call the number on this page to be connected with a local plumber in Clarksburg.

Plumbing services in Clarksburg
The north end of the I-270 corridor
Clarksburg began as an 18th-century crossroads (Dowden's Ordinary is a reminder) and today is mostly new subdivisions about four miles north of Germantown and 26 miles from downtown Washington. Montgomery County governs it, and its edges are not officially defined. Clarksburg Town Center, the Premium Outlets, Little Bennett Park, Black Hill Regional Park and Ten Mile Creek are the landmarks people use for directions.
Young houses, first replacements
The median home here was built in 2010, and roughly 84% of housing units went up between 2000 and 2019. Only about 6% predate 1980. So the typical call is not about corroded old pipe; it is about original equipment reaching first-replacement age: tank water heaters, sump pumps, faucet cartridges, toilet fill valves, pressure-reducing valves and garbage disposals. Builder-grade PEX and fittings also show up in leak calls.
Water, sewer and the line to your house
WSSC Water supplies most of Montgomery County, and the county Water and Sewer Plan gives each property a category for community service or individual systems, so on the rural fringe confirm what your lot has. WSSC uses a chlorine residual, adds UV disinfection as an extra barrier, and doses orthophosphate to limit corrosion. WSSC's Seneca Water Resource Recovery Facility in Germantown serves the northern part of the county. WSSC is responsible for the service line from the main to the property line; from the property line into the house, the pipe is yours. Ten Mile Creek is described as a drinking water source and emergency supply for the Washington area, and the county limited development near it.
The 2007-2009 sprinkler detail
WSSC required testable double-check backflow assemblies on residential fire sprinkler systems in homes built from 2007 through 2009. Those assemblies, along with irrigation pressure vacuum breakers and RPs, must be tested every year and after installation or repair by a plumber holding a WSSC license who is a certified cross-connection technician. Dual check valves are rebuilt or replaced every five years.
Permits
WSSC issues permits for and inspects plumbing and all natural gas and LP gas installations in Montgomery County; replacing a gas water heater requires a plumber or gasfitter holding a WSSC license, with the application filed through WSSC ePermitting (301-206-4003). Montgomery County's Department of Permitting Services handles building permits.
Gas leaks
Washington Gas serves the area; some older rural properties on the edges may use propane. If you smell gas, leave the house first, then call 911 and Washington Gas at 844-WASHGAS (844-927-4427), option 1, or your propane supplier if you have a tank.
Calling
Mention your subdivision and what is wrong. You will be connected with an independent plumber who works in Clarksburg and sets price and schedule with you.
Common questions in Clarksburg
Why do so many Clarksburg homes need new water heaters now?
Does my Clarksburg fire sprinkler system need a backflow test?
Which part of the water line am I responsible for in Clarksburg?
Do propane appliances need a permit in Clarksburg?
Nearby cities and towns
Sources
- Wikipedia: Clarksburg, Maryland
- Point2Homes: Clarksburg demographics
- Montgomery County DEP: Public water and sewer service
- WSSC Water: Annual Water Quality Report (PDF)
- Wikipedia: Washington Suburban Sanitary Commission
- WSSC Water: Service lines
- WSSC Water: Cross-connection control and backflow testing
- WSSC Water: Plumbing inspections
- WSSC Water: Permit information for homeowners
- Maryland Office of People's Counsel: Your local gas companies
- Washington Gas
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