Missouri · 14 covered places · 18 ZIP codes
Plumbers in St. Charles County, MO
We cover 14 cities and towns in St. Charles County, Missouri, across 18 ZIP codes, including Saint Charles, O Fallon, Saint Peters. About 412,000 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 | 5% |
| 1960–1979 | 18% |
| 1980–1999 | 37% |
| 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 |
|---|---|---|
| Saint Charles | 141,641 | 11% |
| O Fallon | 100,311 | 3% |
| Saint Peters | 74,876 | 3% |
| Wentzville | 50,420 | 6% |
| Lake Saint Louis | 27,893 | 1% |
| Foristell | 10,207 | 6% |
| Defiance | 3,554 | 11% |
| Augusta | 1,676 | 30% |
| Portage Des Sioux | 717 | 35% |
| West Alton | 537 | 41% |
What goes wrong in St. Charles County homes
1980s and 90s construction and polybutylene
37% 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.
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.
Natural gas in most homes
66% 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
25% of homes here were built before 1980, when pipes were more often run through exterior walls and uninsulated crawl spaces. In a cold Missouri winter those are the lines that freeze and split. See frozen and burst pipe repair.
Common plumbing work in St. Charles County
City pages in St. Charles County
Other covered towns in St. Charles County
- Augusta (1 ZIP)
- Cottleville (1 ZIP)
- Defiance (1 ZIP)
- Flinthill (1 ZIP)
- Foristell (1 ZIP)
- Lake Saint Louis (1 ZIP)
- New Melle (1 ZIP)
- Portage Des Sioux (1 ZIP)
- Saint Peters (1 ZIP)
- St. Charles (1 ZIP)
- Wentzville (1 ZIP)
- West Alton (1 ZIP)
St. Charles County plumbing FAQ
Which towns in St. Charles County do you cover?
14 places: Augusta, Cottleville, Defiance, Flinthill, Foristell, Lake Saint Louis, New Melle, O Fallon, Portage Des Sioux, Saint Charles, Saint Peters, St. Charles, Wentzville, West Alton. Enter your ZIP code to confirm coverage for your street.
How old are homes in St. Charles County?
Across the covered ZIP codes, Census estimates put 7% of homes as built before 1960, 18% from 1960 to 1979, 37% from 1980 to 1999 and 38% in 2000 or later.
Who licenses plumbers in St. Charles County, MO?
Missouri has no statewide plumbing license; cities and counties such as St. Louis and Kansas City license plumbers locally.
Housing and heating figures are US Census Bureau ACS 2023 5-year estimates for the ZIP code areas we cover in St. Charles County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in St. Charles County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.