Illinois · 18 covered places · 27 ZIP codes
Plumbers in St. Clair County, IL
We cover 18 cities and towns in St. Clair County, Illinois, across 27 ZIP codes, including Belleville, East Saint Louis, O'Fallon. About 246,000 people live in those ZIP codes. 33% of the homes were built before 1960, so galvanized pipe and old cast iron drains are common.
| Year built | Share of homes |
|---|---|
| Before 1940 | 13% |
| 1940–1959 | 20% |
| 1960–1979 | 22% |
| 1980–1999 | 23% |
| 2000 or later | 22% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| Belleville | 93,484 | 34% |
| East Saint Louis | 41,096 | 52% |
| O'Fallon | 35,536 | 10% |
| Fairview Heights | 16,653 | 29% |
| Mascoutah | 10,292 | 29% |
| Caseyville | 7,480 | 39% |
| Freeburg | 6,522 | 23% |
| Millstadt | 6,518 | 28% |
| Lebanon | 6,339 | 24% |
| Scott Air Force Base | 5,606 | 11% |
What goes wrong in St. Clair County homes
Pre-1960 homes: galvanized pipe and cast iron
33% of homes in St. Clair County's covered ZIP codes were built before 1960, 13% 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
61% 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
55% of homes here were built before 1980, when pipes were more often run through exterior walls and uninsulated crawl spaces. In a long Illinois winter those are the lines that freeze and split. See frozen and burst pipe repair.
Hard water
Illinois water is generally hard. With 61% of homes here on gas, scale settles as sediment in gas water heater tanks, which then rumble and wear out early. See water softener installation.
Common plumbing work in St. Clair County
Other covered towns in St. Clair County
- Belleville (5 ZIPs)
- Caseyville (1 ZIP)
- Dupo (1 ZIP)
- East Carondelet (1 ZIP)
- East Saint Louis (6 ZIPs)
- Fairview Heights (1 ZIP)
- Freeburg (1 ZIP)
- Lebanon (1 ZIP)
- Lovejoy (1 ZIP)
- Marissa (1 ZIP)
- Mascoutah (1 ZIP)
- Millstadt (1 ZIP)
- National Stock Yards (1 ZIP)
- New Athens (1 ZIP)
- O'Fallon (1 ZIP)
- Scott Air Force Base (1 ZIP)
- Smithton (1 ZIP)
- Summerfield (1 ZIP)
St. Clair County plumbing FAQ
Which towns in St. Clair County do you cover?
18 places: Belleville, Caseyville, Dupo, East Carondelet, East Saint Louis, Fairview Heights, Freeburg, Lebanon, Lovejoy, Marissa, Mascoutah, Millstadt, National Stock Yards, New Athens, O'Fallon, Scott Air Force Base, Smithton, Summerfield. Enter your ZIP code to confirm coverage for your street.
How old are homes in St. Clair County?
Across the covered ZIP codes, Census estimates put 33% of homes as built before 1960, 22% from 1960 to 1979, 23% from 1980 to 1999 and 22% in 2000 or later.
Who licenses plumbers in St. Clair County, IL?
The Illinois Department of Public Health licenses plumbers and plumbing contractors must register; Chicago adds its own requirements.
Housing and heating figures are US Census Bureau ACS 2023 5-year estimates for the ZIP code areas we cover in St. Clair County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in St. Clair County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.