Missouri · 16 covered places · 75 ZIP codes
Plumbers in St. Louis County, MO
We cover 16 cities and towns in St. Louis County, Missouri, across 75 ZIP codes, including Saint Louis, Florissant, Ballwin. About 1,330,000 people live in those ZIP codes. 45% of the homes were built before 1960, so galvanized pipe and old cast iron drains are common.
| Year built | Share of homes |
|---|---|
| Before 1940 | 23% |
| 1940–1959 | 22% |
| 1960–1979 | 28% |
| 1980–1999 | 17% |
| 2000 or later | 10% |
Share of housing units in the covered ZIP codes. Census ACS 2023 5-year estimates.
| Place | Residents in covered ZIPs | Built before 1960 |
|---|---|---|
| Saint Louis | 891,907 | 58% |
| Florissant | 112,073 | 25% |
| Ballwin | 92,571 | 7% |
| Chesterfield | 62,753 | 3% |
| Fenton | 45,267 | 9% |
| Maryland Heights | 21,651 | 11% |
| Eureka | 18,483 | 9% |
| Hazelwood | 17,953 | 20% |
| Saint Ann | 16,237 | 60% |
| Wildwood | 15,958 | 7% |
What goes wrong in St. Louis County homes
Pre-1960 homes: galvanized pipe and cast iron
45% of homes in St. Louis County's covered ZIP codes were built before 1960, 23% 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
73% 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.
Hard water
Missouri water is generally hard. With 73% 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. Louis County
City pages in St. Louis County
Other covered towns in St. Louis County
- Ballwin (4 ZIPs)
- Bridgeton (1 ZIP)
- Chesterfield (3 ZIPs)
- Creve Coeur (1 ZIP)
- Eureka (1 ZIP)
- Fenton (2 ZIPs)
- Glencoe (1 ZIP)
- Grover (1 ZIP)
- Hazelwood (1 ZIP)
- Maryland Heights (1 ZIP)
- Oakville (1 ZIP)
- Saint Ann (1 ZIP)
- Valley Park (1 ZIP)
- Wildwood (2 ZIPs)
St. Louis County plumbing FAQ
Which towns in St. Louis County do you cover?
16 places: Ballwin, Bridgeton, Chesterfield, Creve Coeur, Eureka, Fenton, Florissant, Glencoe, Grover, Hazelwood, Maryland Heights, Oakville, Saint Ann, Saint Louis, Valley Park, Wildwood. Enter your ZIP code to confirm coverage for your street.
How old are homes in St. Louis County?
Across the covered ZIP codes, Census estimates put 45% of homes as built before 1960, 28% from 1960 to 1979, 17% from 1980 to 1999 and 10% in 2000 or later.
Who licenses plumbers in St. Louis 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. Louis County, combined across places and weighted by housing units. Some ZIP codes extend into neighboring counties.
Need a plumber in St. Louis County?
Same-day service when a plumber is available. One call connects you with a licensed plumber who serves your ZIP.