New Jersey · 10 covered places · 39 ZIP codes
Plumbers in Mercer County, NJ
We cover 10 cities and towns in Mercer County, New Jersey, across 39 ZIP codes, including Trenton, Princeton, Lawrence Township. About 411,000 people live in those ZIP codes. 39% of the homes were built before 1960, so galvanized pipe and old cast iron drains are common.
| Year built | Share of homes |
|---|---|
| Before 1940 | 18% |
| 1940–1959 | 21% |
| 1960–1979 | 23% |
| 1980–1999 | 23% |
| 2000 or later | 15% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| Trenton | 234,701 | 50% |
| Princeton | 56,462 | 28% |
| Lawrence Township | 31,142 | 22% |
| Hightstown | 29,321 | 20% |
| Princeton Junction | 20,876 | 11% |
| Robbinsville | 16,924 | 7% |
| Pennington | 13,174 | 32% |
| Hopewell | 4,567 | 52% |
| Titusville | 3,334 | 43% |
| Windsor | 381 | 54% |
What goes wrong in Mercer County homes
Pre-1960 homes: galvanized pipe and cast iron
39% of homes in Mercer County's covered ZIP codes were built before 1960, 18% of them before 1940. Houses that old often still have galvanized steel supply lines that rust closed from the inside, and cast iron or clay sewer pipe that cracks and lets roots in. Weak pressure at upstairs fixtures, brown water after a shutoff and slow drains are the usual clues. Typical fixes are whole-house repiping and a sewer camera inspection.
Natural gas in most homes
73% 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
62% of homes here were built before 1980, when pipes were more often run through exterior walls and uninsulated crawl spaces. In a cold New Jersey winter those are the lines that freeze and split. See frozen and burst pipe repair.
Common plumbing work in Mercer County
City pages in Mercer County
Other covered towns in Mercer County
- Hightstown (1 ZIP)
- Hopewell (1 ZIP)
- Lawrence Township (1 ZIP)
- Pennington (1 ZIP)
- Princeton (5 ZIPs)
- Princeton Junction (1 ZIP)
- Robbinsville (1 ZIP)
- Titusville (1 ZIP)
- Windsor (1 ZIP)
Mercer County plumbing FAQ
Which towns in Mercer County do you cover?
10 places: Hightstown, Hopewell, Lawrence Township, Pennington, Princeton, Princeton Junction, Robbinsville, Titusville, Trenton, Windsor. Enter your ZIP code to confirm coverage for your street.
How old are homes in Mercer County?
Across the covered ZIP codes, Census estimates put 39% of homes as built before 1960, 23% from 1960 to 1979, 23% from 1980 to 1999 and 15% in 2000 or later.
Who licenses plumbers in Mercer County, NJ?
The New Jersey State Board of Examiners of Master Plumbers licenses master plumbers; check a license through the Division of Consumer Affairs.
Housing and heating figures are US Census Bureau ACS 2023 5-year estimates for the ZIP code areas we cover in Mercer County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in Mercer County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.