St. Charles County · O Fallon, MO
Plumbers in O Fallon, MO
O Fallon is in St. Charles County, Missouri. About 100,000 people live in the 2 ZIP codes we cover here, in roughly 39,000 homes, 74% of them single-family detached houses. The biggest share of the housing was built in 2000 or later (48%), and that age decides most of what goes wrong with the plumbing.
- Same-day service when a plumber is available
- 2 ZIP codes covered
ZIP codes we cover in O Fallon
63366, 63368
O Fallon homes and their plumbing
Here is how O Fallon's homes break down by year built, based on Census estimates for the covered ZIP codes: before 1940 1%, 1940–1959 3%, 1960–1979 10%, 1980–1999 39%, 2000 or later 48%. With so much newer construction, the plumbing itself is usually sound, and most calls are about water heaters, fixtures, pressure and clogs. Neighboring areas such as Saint Charles are covered too.
| Year built | Share of homes |
|---|---|
| Before 1940 | 1% |
| 1940–1959 | 3% |
| 1960–1979 | 10% |
| 1980–1999 | 39% |
| 2000 or later | 48% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
- Residents in covered ZIPs
- 100,311
- Housing units
- 38,519
- Single-family detached
- 74%
- Owner-occupied
- 81%
- Heated with utility gas
- 69%
- Heated with electricity
- 28%
What goes wrong in O Fallon homes
Newer homes on their first water heater
48% 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.
1980s and 90s construction and polybutylene
39% 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.
Natural gas in most homes
69% 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
13% 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 calls in O Fallon
- Water Heater Replacement
- Polybutylene Pipe Replacement
- Gas Line Repair
- Frozen & Burst Pipe Repair
- Water Softener Installation
- Drain Cleaning
- Main Water Line Repair
- Sewer Line Repair
Also available in O Fallon: emergency plumbing and every plumbing service.
O Fallon at a glance
- County
- St. Charles County
- Nearest city pages
- Saint Charles
- ZIP codes
- 63366, 63368
O Fallon plumbing FAQ
How old are the homes in O Fallon?
In the ZIP codes we cover around O Fallon, Census estimates put 3% of homes as built before 1960, 10% from 1960 to 1979, 39% from 1980 to 1999 and 48% in 2000 or later. The largest group is 2000 or later (48%).
Who licenses plumbers in O Fallon, MO?
Missouri has no statewide plumbing license; cities and counties such as St. Louis and Kansas City license plumbers locally.
Are water heaters in O Fallon usually gas or electric?
Census data for the area show 69% of homes heating with utility gas, 28% with electricity. Water heaters often use the same fuel as the home's heat, so utility gas is the most common here, but check the label on your tank before you shop for a replacement.
Guides for O Fallon homeowners
Nearby areas
Also covered nearby: Lake Saint Louis (0 mi), Cottleville (4 mi), Saint Peters (6 mi), Wentzville (8 mi), Flinthill (10 mi), New Melle (10 mi), Chesterfield (11 mi), St. Charles (11 mi).
Housing, heating and population figures are US Census Bureau American Community Survey 2023 5-year estimates for the ZIP code areas we cover in O Fallon, so they may include neighboring communities that share those ZIP codes.
Need a plumber in O Fallon?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.