Iowa · 4 covered places · 5 ZIP codes
Plumbers in Johnson County, IA
We cover 4 cities and towns in Johnson County, Iowa, across 5 ZIP codes, including Iowa City, Coralville, North Liberty. About 107,000 people live in those ZIP codes. 37% 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 | 7% |
| 1940–1959 | 7% |
| 1960–1979 | 21% |
| 1980–1999 | 29% |
| 2000 or later | 37% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| Iowa City | 57,990 | 19% |
| Coralville | 22,846 | 7% |
| North Liberty | 22,392 | 4% |
| Swisher | 3,865 | 14% |
What goes wrong in Johnson County homes
Newer homes on their first water heater
37% 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.
Natural gas in most homes
64% 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.
Long, hard winters
34% of homes here were built before 1980, when pipes were more often run through exterior walls and uninsulated crawl spaces. In a long Iowa winter those are the lines that freeze and split. See frozen and burst pipe repair.
1980s and 90s construction and polybutylene
29% 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.
Common plumbing work in Johnson County
Other covered towns in Johnson County
- Coralville (1 ZIP)
- Iowa City (2 ZIPs)
- North Liberty (1 ZIP)
- Swisher (1 ZIP)
Johnson County plumbing FAQ
Which towns in Johnson County do you cover?
4 places: Coralville, Iowa City, North Liberty, Swisher. Enter your ZIP code to confirm coverage for your street.
How old are homes in Johnson County?
Across the covered ZIP codes, Census estimates put 14% of homes as built before 1960, 21% from 1960 to 1979, 29% from 1980 to 1999 and 37% in 2000 or later.
Who licenses plumbers in Johnson County, IA?
Iowa's Plumbing and Mechanical Systems Board licenses plumbers statewide.
Housing and heating figures are US Census Bureau ACS 2023 5-year estimates for the ZIP code areas we cover in Johnson County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in Johnson County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.