Maryland · 28 covered places · 75 ZIP codes
Plumbers in Montgomery County, MD
We cover 28 cities and towns in Montgomery County, Maryland, across 75 ZIP codes, including Silver Spring, Rockville, Gaithersburg. About 1,066,000 people live in those ZIP codes. Most homes date from 1980 to 1999, old enough that original water heaters, valves and drains are wearing out.
| Year built | Share of homes |
|---|---|
| Before 1940 | 4% |
| 1940–1959 | 16% |
| 1960–1979 | 29% |
| 1980–1999 | 31% |
| 2000 or later | 20% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| Silver Spring | 307,872 | 30% |
| Rockville | 144,320 | 16% |
| Gaithersburg | 144,191 | 5% |
| Germantown | 88,744 | 3% |
| Bethesda | 86,851 | 35% |
| Potomac | 49,694 | 6% |
| Montgomery Village | 34,419 | 3% |
| Chevy Chase | 31,269 | 45% |
| Clarksburg | 28,329 | 3% |
| Olney | 25,766 | 4% |
What goes wrong in Montgomery County homes
1980s and 90s construction and polybutylene
31% 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.
1960s and 70s homes reaching end of life
29% 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.
Natural gas in most homes
53% 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
49% 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 plumbing work in Montgomery County
City pages in Montgomery County
Other covered towns in Montgomery County
- Ashton (1 ZIP)
- Barnesville (1 ZIP)
- Bethesda (11 ZIPs)
- Boyds (1 ZIP)
- Brinklow (1 ZIP)
- Brookeville (1 ZIP)
- Burtonsville (1 ZIP)
- Cabin John (1 ZIP)
- Chevy Chase (2 ZIPs)
- Clarksburg (1 ZIP)
- Damascus (1 ZIP)
- Derwood (1 ZIP)
- Garrett Park (1 ZIP)
- Germantown (3 ZIPs)
- Glen Echo (1 ZIP)
- Kensington (2 ZIPs)
- Montgomery Village (1 ZIP)
- Olney (2 ZIPs)
- Poolesville (1 ZIP)
- Potomac (2 ZIPs)
- Sandy Spring (1 ZIP)
- Spencerville (1 ZIP)
- Suburb Maryland Fac (1 ZIP)
- Takoma Park (2 ZIPs)
- Washington Grove (1 ZIP)
Montgomery County plumbing FAQ
Which towns in Montgomery County do you cover?
28 places: Ashton, Barnesville, Bethesda, Boyds, Brinklow, Brookeville, Burtonsville, Cabin John, Chevy Chase, Clarksburg, Damascus, Derwood, Gaithersburg, Garrett Park, Germantown, Glen Echo, Kensington, Montgomery Village, Olney, Poolesville, Potomac, Rockville, Sandy Spring, Silver Spring, Spencerville, Suburb Maryland Fac, Takoma Park, Washington Grove. Enter your ZIP code to confirm coverage for your street.
How old are homes in Montgomery County?
Across the covered ZIP codes, Census estimates put 20% of homes as built before 1960, 29% from 1960 to 1979, 31% from 1980 to 1999 and 20% in 2000 or later.
Who licenses plumbers in Montgomery County, MD?
The Maryland State Board of Plumbing licenses plumbers and gas fitters; check a license through the Maryland Department of Labor.
Housing and heating figures are US Census Bureau ACS 2023 5-year estimates for the ZIP code areas we cover in Montgomery County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in Montgomery County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.