Plumbing repair · Arnold, Missouri
Plumbing repair in Arnold, MO
Leak, backed-up drain, no hot water, or a frozen line? The largest share of Arnold's homes (26%) was built 1960 to 1969[1]. Request a licensed plumber who works here. Arnold, in Jefferson County — ZIP 63010, counts 20,994 residents (2025 estimate)[2].
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Arnold at a glance for plumbing
- Population (2025 est.)
- 20,994[2]+0.5% since 2020
- County
- Jefferson[2]
- Land area
- 11.5 sq mi[3]
- Decade the most homes date from
- 1960 to 1969[1]26% of housing units
- Homes built before 1980
- 54%[1]the 8th-highest share of the 15 St. Louis–area suburbs we cover
- Homes built 1980–1999
- 30%[1]2020–2024
- Homes built 2010 or later
- 6%[1]the 8th-highest share of the 15 St. Louis–area suburbs we cover
- Winter-storm & freeze days, jefferson zone
- 11[4]2016–2025
- Flood & flash-flood reports within 10 mi
- 15[4]12 flash floods, 2016–2025; flood-prone homes need working drainage and backflow prevention
- FEMA flood-insurance claims, local ZIPs
- 1,217[5]53 in the last 10 years; 1,038 paid
- Homes on utility gas heat
- 65%[1]gas piping work usually needs a permit and a licensed installer
Reading the Arnold data for plumbing
Arnold counts 20,994 residents (2025 estimate), growing at a middle-of-the-pack 0.5% since 2020[2]. The city spans 11.5 square miles at 1,827 residents per square mile (the 11th densest) and sits entirely in Jefferson County, served by ZIP code 63010[3].
With 6% of homes built since 2010 and 54% before 1980[1], Arnold'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: 63010[6].
The closest tracked neighbours are Kirkwood (11.0 mi N), Webster Groves (11.1 mi N) and Ballwin (15.2 mi NW)[3].
54% of Arnold's 8,982 housing units predate 1980 and 6% went up in 2010 or later[1] — the 8th-highest pre-1980 share of the 15 St. Louis–area suburbs we cover; nearby, Kirkwood (70%), Webster Groves (80%), and Ballwin (59%) predate 1980. The 30% built in 1980–1999 are at the age where original water heaters and valves get replaced.
The biggest single slice — 26% — was built 1960 to 1969, and the median home dates to 1977[1]. Neighbours from the same era tend to hit the same plumbing problems at the same time.
Freeze risk: the jefferson forecast zone logged 11 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: 15 flood or flash-flood reports within 10 miles over 2016–2025[4], and FEMA logged 1,217 flood-insurance claims across Arnold's ZIPs[5]. Homes that take water need working drainage, sump pumps and backflow prevention.
65% of homes heat with utility gas, and 20% of households rent[1].
Arnold storm calendar
Within 10 miles of Arnold, 2016–2025: 12 flash-flood reports and 3 flood or heavy-rain reports[4]. Peak: 60% in May, July, and August. Busiest year 2023 (3); 2 of 10 years had none. Busiest month July 2022 (2). Latest: flash-flood report, Aug 10, 2025, 8.0 mi out.
| Month | Flash flood | Flood & heavy rain | All |
|---|---|---|---|
| Jan | – | 1 | 1 |
| Apr | 1 | 1 | 2 |
| May | 2 | 1 | 3 |
| Jun | 2 | – | 2 |
| Jul | 3 | – | 3 |
| Aug | 3 | – | 3 |
| Sep | 1 | – | 1 |
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Arnold by the numbers
| Measure | Arnold | Median of 15 | Difference |
|---|---|---|---|
| Built before 1960 | 15.3% | 9.8% | 5 pts higher |
| Renter-occupied | 20% | 23% | 3 pts lower |
| Flood reports (10 mi) | 15 | 14 | 1 more |
| Utility-gas heat | 65% | 69% | 3 pts lower |
| Built before 1980 | 54% | 54% | same as median |
| Median year built | 1977 | 1977 | same as median |
| Built 2010 or later | 6% | 6% | same as median |
Largest differences first. Medians are the middle value across the covered St. Louis–area suburbs, from the same sources.
| City | Flood reports | NFIP claims | Freeze days |
|---|---|---|---|
| Arnold | 15 | 1,217 | 11 |
| Kirkwood 11.0 mi | 20 | 285 | 12 |
| Webster Groves 11.1 mi | 21 | 111 | 12 |
| Ballwin 15.2 mi | 16 | 244 | 12 |
| University City 16.7 mi | 27 | 1,257 | 12 |
| Wildwood 19.2 mi | 18 | 824 | 12 |
| ZIP | Claims | Paid | Busiest year |
|---|---|---|---|
| 63010 | 1,217 | $15,889,513 | 1982 (212) |
ZIPs extend past city limits.
| Date | Type | Distance |
|---|---|---|
| Aug 10, 2025 | Flash Flood | 8.0 mi |
| May 19, 2025 | Heavy Rain | 7.0 mi |
| Apr 4, 2025 | Flash Flood | 3.5 mi |
| Jul 17, 2023 | Flash Flood | 7.0 mi |
| May 14, 2023 | Flash Flood | 9.6 mi |
| May 14, 2023 | Flash Flood | 8.0 mi |
| Jul 28, 2022 | Flash Flood | 9.8 mi |
| Jul 26, 2022 | Flash Flood | 9.0 mi |
| Built | Units | Share | Margin of error |
|---|---|---|---|
| 2020 or later | 77 | 0.9% | ±41 |
| 2010 to 2019 | 473 | 5.3% | ±141 |
| 2000 to 2009 | 905 | 10.1% | ±291 |
| 1990 to 1999 | 1,626 | 18.1% | ±285 |
| 1980 to 1989 | 1,024 | 11.4% | ±234 |
| 1970 to 1979 | 1,195 | 13.3% | ±332 |
| 1960 to 1969 | 2,307 | 25.7% | ±335 |
| 1950 to 1959 | 1,077 | 12.0% | ±275 |
| 1940 to 1949 | 136 | 1.5% | ±95 |
| 1939 or earlier | 162 | 1.8% | ±95 |
ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.
| Measure | Value |
|---|---|
| Housing units | 8,982 |
| Detached single-family | 7,092 (79%) |
| Occupied homes | 8,394 |
| Owner-occupied | 6,699 (80%) |
| Renter-occupied | 1,695 (20%) |
| Median home value | $220,000 |
ACS 2020–2024 estimates.
| Main heating fuel | Homes | Share | Margin of error |
|---|---|---|---|
| Utility gas | 5,489 | 65.4% | ±462 |
| Electricity | 2,591 | 30.9% | ±338 |
| Bottled or tank gas (propane, butane, etc.) | 148 | 1.8% | ±94 |
| Fuel oil, kerosene, etc. | 80 | 1.0% | ±119 |
| Wood | 54 | 0.6% | ±43 |
| No fuel used | 32 | 0.4% | ±37 |
| ZIP (ZCTA) | Share of Arnold's land | Share of the ZIP inside the city |
|---|---|---|
| 63010 | 100% | 54% |
Dated heat and freeze records for the JEFFERSON forecast zone: see the county list.
Common Arnold plumbing questions
Are Arnold homes likely to have old galvanized pipes?
Only an inspection can say, but age is the clue: 15% were built before 1960 and 54% before 1980[1].
How often do pipes freeze in Arnold?
The record for Arnold's forecast zone shows 11 winter-storm or freeze days over 2016–2025, in 8 different years[4].
Which ZIP codes are covered in Arnold?
63010[6], in Jefferson County. Nearby suburbs with their own pages: Kirkwood (11.0 mi), Webster Groves (11.1 mi), and Ballwin (15.2 mi)[3].
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.