Montgomery County · Potomac, MD
Plumbers in Potomac, MD
Potomac is in Montgomery County, Maryland. About 50,000 people live in the 2 ZIP codes we cover here, in roughly 17,000 homes, 81% of them single-family detached houses. The biggest share of the housing was built between 1960 and 1979 (48%), and that age decides most of what goes wrong with the plumbing.
- Same-day service when a plumber is available
- 2 ZIP codes covered
ZIP codes we cover in Potomac
20854, 20859
Potomac homes and their plumbing
Here is how Potomac's homes break down by year built, based on Census estimates for the covered ZIP codes: before 1940 1%, 1940–1959 5%, 1960–1979 48%, 1980–1999 34%, 2000 or later 12%. Most homes are old enough that original pipe, valves and water heaters are wearing out, but young enough that full repipes are a case-by-case call. Neighboring areas such as Bethesda, Rockville, Gaithersburg are covered too.
| Year built | Share of homes |
|---|---|
| Before 1940 | 1% |
| 1940–1959 | 5% |
| 1960–1979 | 48% |
| 1980–1999 | 34% |
| 2000 or later | 12% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
- Residents in covered ZIPs
- 49,694
- Housing units
- 17,119
- Single-family detached
- 81%
- Owner-occupied
- 90%
- Heated with utility gas
- 68%
- Heated with electricity
- 24%
- Heated with fuel oil
- 5%
What goes wrong in Potomac homes
1960s and 70s homes reaching end of life
48% of the housing here dates from 1960 to 1979. Original copper supply lines in those homes are now 45 to 65 years old, and cast iron drains of that age scale up inside and crack. Seized shutoff valves, pinhole leaks and recurring main-line clogs are common calls. A camera inspection shows the condition of the sewer line before anyone digs.
1980s and 90s construction and polybutylene
34% of homes were built between 1980 and 1999. Polybutylene supply pipe was installed widely in US homes from about 1978 to 1995, so houses from these years are worth checking for gray plastic pipe stamped PB2110, usually visible at the water heater or under sinks. Insurers and buyers often ask about it. See polybutylene replacement.
Natural gas in most homes
68% of occupied homes here heat with utility gas, so gas water heaters, ranges and dryers are common. That means gas line extensions for new appliances, flexible connector replacements and venting checks when a water heater is swapped. If you smell gas, leave first and call the gas utility from outside. See gas line repair.
Winter freezes
53% of homes here were built before 1980, when pipes were more often run through exterior walls and uninsulated crawl spaces. In a cold Maryland winter those are the lines that freeze and split. See frozen and burst pipe repair.
Common calls in Potomac
- Sewer Camera Inspection
- Polybutylene Pipe Replacement in Potomac, MD
- Gas Line Repair
- Frozen & Burst Pipe Repair
- Water Heater Replacement
- Drain Cleaning
- Main Water Line Repair
- Sewer Line Repair
Also available in Potomac: emergency plumbing and every plumbing service.
Potomac at a glance
- County
- Montgomery County
- Nearest city pages
- Bethesda, Rockville, Gaithersburg, Silver Spring
- ZIP codes
- 20854, 20859
Potomac plumbing FAQ
How old are the homes in Potomac?
In the ZIP codes we cover around Potomac, Census estimates put 6% of homes as built before 1960, 48% from 1960 to 1979, 34% from 1980 to 1999 and 12% in 2000 or later. The largest group is 1960–1979 (48%).
Who licenses plumbers in Potomac, MD?
The Maryland State Board of Plumbing licenses plumbers and gas fitters; check a license through the Maryland Department of Labor.
Are water heaters in Potomac usually gas or electric?
Census data for the area show 68% of homes heating with utility gas, 24% with electricity, 5% with fuel oil. Water heaters often use the same fuel as the home's heat, so utility gas is the most common here, but check the label on your tank before you shop for a replacement.
Guides for Potomac homeowners
Nearby areas
Also covered nearby: Cabin John (3 mi), Glen Echo (4 mi), Garrett Park (6 mi), Chevy Chase (7 mi), Derwood (7 mi), Kensington (7 mi), Suburb Maryland Fac (8 mi), Washington Grove (9 mi).
Housing, heating and population figures are US Census Bureau American Community Survey 2023 5-year estimates for the ZIP code areas we cover in Potomac, so they may include neighboring communities that share those ZIP codes.
Need a plumber in Potomac?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.