Maryland · 7 covered places · 7 ZIP codes
Plumbers in St. Mary's County, MD
We cover 7 cities and towns in St. Mary's County, Maryland, across 7 ZIP codes, including Lexington Park, Mechanicsville, Leonardtown. About 94,000 people live in those ZIP codes. 38% of the homes were built in 2000 or later, so most calls are about water heaters, fixtures and clogs rather than old pipe.
| Year built | Share of homes |
|---|---|
| Before 1940 | 2% |
| 1940–1959 | 6% |
| 1960–1979 | 19% |
| 1980–1999 | 35% |
| 2000 or later | 38% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| Lexington Park | 26,799 | 10% |
| Mechanicsville | 23,918 | 9% |
| Leonardtown | 15,979 | 9% |
| California | 14,743 | 5% |
| Great Mills | 6,976 | 3% |
| Charlotte Hall | 5,259 | 6% |
| Compton | – | – |
What goes wrong in St. Mary's County homes
1980s and 90s construction and polybutylene
35% 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.
Oil-heated homes
15% of occupied homes here heat with fuel oil, far above the national norm. Many of them make hot water with a tankless coil inside the boiler, which runs the boiler all summer. Plumbers often replace the coil with an indirect tank or a standalone water heater when the boiler is serviced or replaced.
Newer homes on their first water heater
38% of homes here were built in 2000 or later. Those houses usually have PEX or CPVC supply lines in good shape, so the work is on equipment: original tank water heaters past their 8 to 12 year service life, expansion tanks, pressure regulators and fixtures. See water heater replacement.
Mostly electric homes
60% of occupied homes here heat with electricity, and electric tank water heaters are the norm. Failed elements and thermostats are repairable, but tanks that leak need replacement. Heat pump water heaters are an efficient replacement where there's space and airflow.
Common plumbing work in St. Mary's County
Other covered towns in St. Mary's County
- California (1 ZIP)
- Charlotte Hall (1 ZIP)
- Compton (1 ZIP)
- Great Mills (1 ZIP)
- Leonardtown (1 ZIP)
- Lexington Park (1 ZIP)
- Mechanicsville (1 ZIP)
St. Mary's County plumbing FAQ
Which towns in St. Mary's County do you cover?
7 places: California, Charlotte Hall, Compton, Great Mills, Leonardtown, Lexington Park, Mechanicsville. Enter your ZIP code to confirm coverage for your street.
How old are homes in St. Mary's County?
Across the covered ZIP codes, Census estimates put 8% of homes as built before 1960, 19% from 1960 to 1979, 35% from 1980 to 1999 and 38% in 2000 or later.
Who licenses plumbers in St. Mary's 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 St. Mary's County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in St. Mary's County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.