Plumbing repair · Lake St. Louis, Missouri
Plumbing repair in Lake St. Louis, MO
Leak, backed-up drain, no hot water, or a frozen line? The largest share of Lake St. Louis's homes (25%) was built 2000 to 2009[1]. Request a licensed plumber who works here. Lake St. Louis, in St. Charles County — ZIP 63367, counts 19,129 residents (2025 estimate)[2].
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Lake St. Louis plumbing snapshot: the key figures
- Population (2025 est.)
- 19,129[2]+14.4% since 2020
- County
- St. Charles[2]
- Land area
- 8.6 sq mi[3]
- Decade the most homes date from
- 2000 to 2009[1]25% of housing units
- Homes built before 1980
- 19%[1]the 4th-lowest share of the 15 St. Louis–area suburbs we cover
- Homes built 1980–1999
- 31%[1]2020–2024
- Homes built 2010 or later
- 25%[1]the 2nd-highest share of the 15 St. Louis–area suburbs we cover
- Winter-storm & freeze days, st. charles zone
- 12[4]2016–2025
- Flood & flash-flood reports within 10 mi
- 5[4]5 flash floods, 2016–2025; flood-prone homes need working drainage and backflow prevention
- FEMA flood-insurance claims, local ZIPs
- 14[5]1 in the last 10 years; 8 paid
- Homes on utility gas heat
- 63%[1]gas piping work usually needs a permit and a licensed installer
What the local data means for plumbing in Lake St. Louis
Lake St. Louis is one of the fastest-growing St. Louis–metro suburbs tracked here: 19,129 people (2025 estimate), up 14.4% since 2020[2]. The city spans 8.6 square miles at 2,233 residents per square mile (the 10th densest) and sits entirely in St. Charles County, served by ZIP code 63367[3].
With 25% of homes built since 2010 and 19% before 1980[1], Lake St. Louis's plumbing runs from brand-new supply lines and fixtures to aging pipe, original valves and water heaters past their rated life.
One ZIP code covers the whole city: 63367[6].
The closest tracked neighbours are O'Fallon (3.4 mi E), Wentzville (5.2 mi NW) and St. Peters (9.8 mi E)[3].
19% of Lake St. Louis's 7,657 housing units predate 1980 and 25% went up in 2010 or later[1] — the 4th-lowest pre-1980 share of the 15 St. Louis–area suburbs we cover; nearby, O'Fallon (9%), Wentzville (10%), and St. Peters (25%) predate 1980. New-construction problems are usually fittings, supply lines, water-heater installs and drain slopes, not worn-out pipe.
The biggest single slice — 25% — was built 2000 to 2009, and the median home dates to 2000[1]. Neighbours from the same era tend to hit the same plumbing problems at the same time.
Freeze risk: the st. charles forecast zone logged 12 winter-storm, ice or hard-freeze days in 2016–2025, including February 2021; the latest was Dec 1, 2025[4].
Water from the sky is plumbing work too: 5 flood or flash-flood reports within 10 miles over 2016–2025[4], and FEMA logged 14 flood-insurance claims across Lake St. Louis's ZIPs[5]. Homes that take water need working drainage, sump pumps and backflow prevention.
63% of homes heat with utility gas, and 24% of households rent[1].
Among the 15 suburbs tracked here, Lake St. Louis stands out for the fewest flood reports nearby (5, tied with Wentzville)[4], the 2nd-newest housing (by median year built) (2000, tied with O'Fallon)[1], the 2nd-highest share of homes built since 2010 (25%)[1], and the 2nd-lowest gas-heat share (63%)[1].
plumbing help in Lake St. Louis: what to do next
Plumbing repair contractors taking requests around Lake St. Louis cover ZIP code 63367.
Before reaching out: before the plumber arrives
Lake St. Louis by the numbers
| Measure | Lake St. Louis | Median of 15 | Difference |
|---|---|---|---|
| Built 2010 or later | 25% | 6% | 18 pts higher |
| Built before 1960 | 0.1% | 9.8% | 10 pts lower |
| Flood reports (10 mi) | 5 | 14 | 9 fewer |
| Built before 1980 | 19% | 54% | 35 pts lower |
| Utility-gas heat | 63% | 69% | 5 pts lower |
| Renter-occupied | 24% | 23% | 2 pts higher |
| Median year built | 2000 | 1977 | 23 years newer |
Sorted by largest difference. Each median is the middle value across the covered St. Louis–area suburbs, from the same sources.
| City | Flood reports | NFIP claims |
|---|---|---|
| Lake St. Louis | 5 | 14 |
| O'Fallon 3.4 mi | 6 | 347 |
| Wentzville 5.2 mi | 5 | 13 |
| St. Peters 9.8 mi | 8 | 534 |
| Chesterfield 14.1 mi | 11 | 321 |
| St. Charles 14.6 mi | 12 | 5,630 |
| ZIP | Claims | Paid | Busiest year |
|---|---|---|---|
| 63367 | 14 | $37,396 | 1982 (4) |
ZIPs extend past city limits.
| Date | Type | Distance |
|---|---|---|
| Apr 4, 2025 | Flash Flood | 8.6 mi |
| Jul 26, 2022 | Flash Flood | 9.6 mi |
| Jul 26, 2022 | Flash Flood | 9.3 mi |
| Jun 22, 2020 | Flash Flood | 2.6 mi |
| Jul 10, 2019 | Flash Flood | 5.9 mi |
| Built | Units | Share | Margin of error |
|---|---|---|---|
| 2020 or later | 747 | 9.8% | ±216 |
| 2010 to 2019 | 1,133 | 14.8% | ±246 |
| 2000 to 2009 | 1,944 | 25.4% | ±298 |
| 1990 to 1999 | 1,177 | 15.4% | ±257 |
| 1980 to 1989 | 1,169 | 15.3% | ±246 |
| 1970 to 1979 | 1,151 | 15.0% | ±266 |
| 1960 to 1969 | 332 | 4.3% | ±183 |
| 1950 to 1959 | 4 | 0.1% | ±7 |
| 1940 to 1949 | 0 | 0.0% | ±19 |
| 1939 or earlier | 0 | 0.0% | ±19 |
ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.
| Measure | Value |
|---|---|
| Housing units | 7,657 |
| Detached single-family | 5,118 (67%) |
| Occupied homes | 7,351 |
| Owner-occupied | 5,559 (76%) |
| Renter-occupied | 1,792 (24%) |
| Median home value | $405,900 |
ACS 2020–2024 estimates.
| Main heating fuel | Homes | Share | Margin of error |
|---|---|---|---|
| Utility gas | 4,661 | 63.4% | ±417 |
| Electricity | 2,561 | 34.8% | ±351 |
| Bottled or tank gas (propane, butane, etc.) | 106 | 1.4% | ±70 |
| Other fuel | 23 | 0.3% | ±35 |
| ZIP (ZCTA) | Share of Lake St. Louis's land | Share of the ZIP inside the city |
|---|---|---|
| 63367 | 98% | 65% |
Dated heat and freeze records for the ST. CHARLES forecast zone: see the county list.
Common Lake St. Louis plumbing questions
Are Lake St. Louis homes likely to have old galvanized pipes?
Only an inspection can say, but age is the clue: 0% were built before 1960 and 19% before 1980[1].
How often do pipes freeze in Lake St. Louis?
The record for Lake St. Louis's forecast zone shows 12 winter-storm or freeze days over 2016–2025, in 7 different years[4].
Which ZIP codes are covered in Lake St. Louis?
63367[6], in St. Charles County. Nearby suburbs with their own pages: O'Fallon (3.4 mi), Wentzville (5.2 mi), and St. Peters (9.8 mi)[3].
My Lake St. Louis home is fairly new — could the plumbing and water heater still be under warranty?
Possibly: 25% of Lake St. Louis's housing units were built in 2010 or later[1], the 2nd-highest share of the 15 St. Louis–area suburbs we cover. Check your closing paperwork for warranties before paying for a repair.
Sources
- Census ACS 2020–2024 5-year (keyless bulk)
- Census population estimates, Vintage 2025
- Census Gazetteer 2025
- NOAA Storm Events Database
- OpenFEMA NFIP claims
- Census 2020 ZCTA–place file
Data pulled Sep 28, 2026. Full citations and method.