Plumbing repair · Hazelwood, Missouri
Plumbing repair in Hazelwood, MO
Leak, backed-up drain, no hot water, or a frozen line? The largest share of Hazelwood's homes (31%) was built 1960 to 1969[1]. Request a licensed plumber who works here. Hazelwood, in St. Louis County — ZIPs 63042, 63031, 63044, counts 24,849 residents (2025 estimate)[2].
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Hazelwood at a glance for plumbing
- Population (2025 est.)
- 24,849[2]-2.4% since 2020
- County
- St. Louis[2]
- Land area
- 16.0 sq mi[3]
- Decade the most homes date from
- 1960 to 1969[1]31% of housing units
- Homes built before 1980
- 66%[1]the 5th-highest share of the 15 St. Louis–area suburbs we cover
- Homes built 1980–1999
- 26%[1]2020–2024
- Homes built 2010 or later
- 1%[1]the 2nd-lowest share of the 15 St. Louis–area suburbs we cover
- Winter-storm & freeze days, st. louis zone
- 12[4]2016–2025
- Flood & flash-flood reports within 10 mi
- 13[4]9 flash floods, 2016–2025; flood-prone homes need working drainage and backflow prevention
- FEMA flood-insurance claims, local ZIPs
- 807[5]128 in the last 10 years; 672 paid
- Homes on utility gas heat
- 67%[1]gas piping work usually needs a permit and a licensed installer
What the local data means for plumbing in Hazelwood
Hazelwood is one of the most established suburbs tracked here — 24,849 people (2025 estimate), down just 2.4% since 2020[2]. It covers 16.0 square miles (1,549 residents per square mile, the 13th densest), sits entirely in St. Louis County, in ZIP codes 63042, 63031, 63044[3].
With 1% of homes built since 2010 and 66% before 1980[1], Hazelwood's plumbing runs from brand-new supply lines and fixtures to aging pipe, original valves and water heaters past their rated life.
Mail to Hazelwood goes through 3 ZIP codes — 63042 (63% of the city's land), 63031 (20% of the city's land), 63044 (15% of the city's land)[6].
The tracked suburbs closest by are Florissant (3.7 mi E), St. Charles (6.4 mi W) and Maryland Heights (6.8 mi SW)[3].
66% of Hazelwood's 12,379 housing units predate 1980 and 1% went up in 2010 or later[1] — the 5th-highest pre-1980 share of the 15 St. Louis–area suburbs we cover; nearby, Florissant (90%), St. Charles (38%), and Maryland Heights (61%) predate 1980. Houses that old can still have galvanized supply pipe or cast-iron drains — especially the 19% built before 1960.
The biggest single slice — 31% — was built 1960 to 1969, and the median home dates to 1970[1]. Neighbours from the same era tend to hit the same plumbing problems at the same time.
Freeze risk: the st. louis 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: 13 flood or flash-flood reports within 10 miles over 2016–2025[4], and FEMA logged 807 flood-insurance claims across Hazelwood's ZIPs[5]. Homes that take water need working drainage, sump pumps and backflow prevention.
67% of homes heat with utility gas, and 41% of households rent[1]. Tenants: report plumbing failures to the landlord in writing.
Measured against the 15 suburbs on this site, Hazelwood records the 2nd-lowest share of homes built since 2010 (1%)[1] and the 3rd-highest renter share (41%)[1].
Hazelwood storm calendar
Within 10 miles of Hazelwood, 2016–2025: 9 flash-flood reports and 4 flood or heavy-rain reports[4]. Peak: 62% in April, May, and August. Busiest year 2019 (3); 3 of 10 years had none. Busiest month May 2019 (2). Latest: flash-flood report, Apr 4, 2025, 5.8 mi out.
| Month | Flash flood | Flood & heavy rain | All |
|---|---|---|---|
| Apr | 1 | 1 | 2 |
| May | 2 | – | 2 |
| Jul | 2 | – | 2 |
| Aug | 4 | – | 4 |
| Sep | – | 1 | 1 |
| Nov | – | 2 | 2 |
Get plumbing help in Hazelwood
Plumbing repair contractors taking requests around Hazelwood cover ZIP codes 63042, 63031, 63044.
Before you pick up the phone: before the plumber arrives
The data underneath this Hazelwood page
| Measure | Hazelwood | Median of 15 | Difference |
|---|---|---|---|
| Built before 1960 | 19.2% | 9.8% | 9 pts higher |
| Renter-occupied | 41% | 23% | 18 pts higher |
| Built 2010 or later | 1% | 6% | 5 pts lower |
| Built before 1980 | 66% | 54% | 11 pts higher |
| Flood reports (10 mi) | 13 | 14 | 1 fewer |
| Utility-gas heat | 67% | 69% | 2 pts lower |
| Median year built | 1970 | 1977 | 7 years older |
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 |
|---|---|---|
| Hazelwood | 13 | 807 |
| Florissant 3.7 mi | 16 | 527 |
| St. Charles 6.4 mi | 12 | 5,630 |
| Maryland Heights 6.8 mi | 14 | 161 |
| University City 9.6 mi | 27 | 1,257 |
| St. Peters 11.2 mi | 8 | 534 |
| ZIP | Claims | Paid | Busiest year |
|---|---|---|---|
| 63042 | 360 | $22,405,942 | 2008 (58) |
| 63031 | 372 | $5,488,817 | 2008 (102) |
| 63044 | 75 | $1,999,333 | 1982 (14) |
ZIPs extend past city limits.
| Date | Type | Distance |
|---|---|---|
| Apr 4, 2025 | Flash Flood | 5.8 mi |
| Apr 4, 2025 | Flood | 2.0 mi |
| Nov 4, 2024 | Heavy Rain | 6.0 mi |
| Nov 4, 2024 | Flood | 7.1 mi |
| Sep 26, 2023 | Heavy Rain | 5.8 mi |
| Aug 4, 2022 | Flash Flood | 4.9 mi |
| Jul 28, 2022 | Flash Flood | 9.4 mi |
| Aug 8, 2020 | Flash Flood | 8.5 mi |
| Built | Units | Share | Margin of error |
|---|---|---|---|
| 2020 or later | 0 | 0.0% | ±23 |
| 2010 to 2019 | 177 | 1.4% | ±160 |
| 2000 to 2009 | 904 | 7.3% | ±312 |
| 1990 to 1999 | 1,113 | 9.0% | ±381 |
| 1980 to 1989 | 2,067 | 16.7% | ±360 |
| 1970 to 1979 | 1,901 | 15.4% | ±458 |
| 1960 to 1969 | 3,840 | 31.0% | ±493 |
| 1950 to 1959 | 1,590 | 12.8% | ±318 |
| 1940 to 1949 | 668 | 5.4% | ±432 |
| 1939 or earlier | 119 | 1.0% | ±98 |
ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.
| Measure | Value |
|---|---|
| Housing units | 12,379 |
| Detached single-family | 7,427 (60%) |
| Occupied homes | 11,344 |
| Owner-occupied | 6,706 (59%) |
| Renter-occupied | 4,638 (41%) |
| Median home value | $167,400 |
ACS 2020–2024 estimates.
| Main heating fuel | Homes | Share | Margin of error |
|---|---|---|---|
| Utility gas | 7,567 | 66.7% | ±571 |
| Electricity | 3,388 | 29.9% | ±580 |
| Bottled or tank gas (propane, butane, etc.) | 341 | 3.0% | ±231 |
| No fuel used | 31 | 0.3% | ±47 |
| Other fuel | 17 | 0.1% | ±33 |
| ZIP (ZCTA) | Share of Hazelwood's land | Share of the ZIP inside the city |
|---|---|---|
| 63042 | 63% | 98% |
| 63031 | 20% | 22% |
| 63044 | 15% | 14% |
Dated heat and freeze records for the ST. LOUIS forecast zone: see the county list.
Common Hazelwood plumbing questions
Are Hazelwood homes likely to have old galvanized pipes?
Only an inspection can say, but age is the clue: 19% were built before 1960 and 66% before 1980[1].
How often do pipes freeze in Hazelwood?
The record for Hazelwood's forecast zone shows 12 winter-storm or freeze days over 2016–2025, in 7 different years[4].
Which ZIP codes are covered in Hazelwood?
63042, 63031, and 63044[6], in St. Louis County. Nearby suburbs with their own pages: Florissant (3.7 mi), St. Charles (6.4 mi), and Maryland Heights (6.8 mi)[3].
I rent in Hazelwood. Who arranges the repair?
41% of occupied Hazelwood homes are rented[1], the 3rd-highest share of the 15 St. Louis–area suburbs we cover. Tell your landlord or property manager in writing first; your lease says who arranges repairs.
My Hazelwood home runs on propane — does that matter?
3.0% of occupied Hazelwood homes heat mainly with bottled, tank or LP gas[1], at least twice the median share of the suburbs we cover (1.4%). Homes on propane need a contractor who works on LP appliances — mention it when you request service.
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.