Plumbing repair · Florissant, Missouri

Plumbing repair in Florissant, MO

Leak, backed-up drain, no hot water, or a frozen line? The largest share of Florissant's homes (38%) was built 1960 to 1969^[1]. Request a licensed plumber who works here. Florissant, in St. Louis County — ZIPs 63031, 63033, counts 51,124 residents (2025 estimate)^[2].

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Florissant plumbing snapshot: the key figures

Population (2025 est.): 51,124^[2]-2.7% since 2020
County: St. Louis^[2]
Land area: 12.6 sq mi^[3]
Population density: 4,073 / sq mi^[2]^[3]
Decade the most homes date from: 1960 to 1969^[1]38% of housing units
Homes built before 1980: 90%^[1]the highest share of the 15 St. Louis–area suburbs we cover
Homes built 1980–1999: 8%^[1]2020–2024
Homes built 2010 or later: 1%^[1]the 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: 16^[4]11 flash floods, 2016–2025; flood-prone homes need working drainage and backflow prevention
FEMA flood-insurance claims, local ZIPs: 527^[5]68 in the last 10 years; 405 paid
Homes on utility gas heat: 83%^[1]gas piping work usually needs a permit and a licensed installer

What Florissant's numbers say about plumbing

Florissant is one of the most established suburbs tracked here — 51,124 people (2025 estimate), down just 2.7% since 2020^[2]. The city spans 12.6 square miles at 4,073 residents per square mile (the 2nd densest) and sits entirely in St. Louis County, served by ZIP codes 63031, 63033^[3].

With 1% of homes built since 2010 and 90% before 1980^[1], Florissant's plumbing runs from brand-new supply lines and fixtures to aging pipe, original valves and water heaters past their rated life.

Florissant is split across 2 ZIP codes: 63031 (64% of the city's land), 63033 (36% of the city's land)^[6].

Nearest of the other suburbs we track: Hazelwood (3.7 mi W), University City (9.3 mi S) and Maryland Heights (9.7 mi SW)^[3].

90% of Florissant's 23,064 housing units predate 1980 and 1% went up in 2010 or later^[1] — the highest pre-1980 share of the 15 St. Louis–area suburbs we cover; nearby, Hazelwood (66%), University City (85%), and Maryland Heights (61%) predate 1980. Houses that old can still have galvanized supply pipe or cast-iron drains — especially the 38% built before 1960.

The biggest single slice — 38% — was built 1960 to 1969, and the median home dates to 1963^[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: 16 flood or flash-flood reports within 10 miles over 2016–2025^[4], and FEMA logged 527 flood-insurance claims across Florissant's ZIPs^[5]. Homes that take water need working drainage, sump pumps and backflow prevention.

83% of homes heat with utility gas, and 33% of households rent^[1].

Out of the 15 suburbs on this site, Florissant has the highest pre-1980 housing share (90%)^[1], the lowest share of homes built since 2010 (1%)^[1], and the 2nd-highest gas-heat share (83%)^[1].

Florissant storm calendar

Within 10 miles of Florissant, 2016–2025: 11 flash-flood reports and 5 flood or heavy-rain reports^[4]. Peak: 69% in April, July, and August. Busiest year 2019 (4); 2 of 10 years had none. Busiest month April 2025 (3). Latest: flash-flood report, Aug 12, 2025, 8.8 mi out.

Florissant, 2016–2025
Month	Flash flood	Flood & heavy rain	All
Apr	2	1	3
May	1	–	1
Jun	–	1	1
Jul	2	–	2
Aug	6	–	6
Sep	–	1	1
Nov	–	2	2

Darker squares, more reports. NOAA Storm Events Database^[4].

Get plumbing help in Florissant

Plumbing repair contractors taking requests around Florissant cover ZIP codes 63031, 63033.

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Before reaching out: before the plumber arrives

The Florissant numbers behind this page

Florissant against the typical suburb we cover (median of 15)^[1]^[4]
Measure	Florissant	Median of 15	Difference
Built before 1960	38.0%	9.8%	28 pts higher
Built 2010 or later	1%	6%	6 pts lower
Built before 1980	90%	54%	35 pts higher
Renter-occupied	33%	23%	10 pts higher
Utility-gas heat	83%	69%	14 pts higher
Flood reports (10 mi)	16	14	2 more
Median year built	1963	1977	14 years older

Largest differences first. Medians are the middle value across the covered St. Louis–area suburbs, from the same sources.

How Florissant compares with its nearest neighbours^[4]^[5]^[3]
City	Flood reports	NFIP claims
Florissant	16	527
Hazelwood 3.7 mi	13	807
University City 9.3 mi	27	1,257
Maryland Heights 9.7 mi	14	161
St. Charles 10.1 mi	12	5,630
Webster Groves 14.8 mi	21	111

Flood-insurance claims by ZIP code, since 1978^[5]
ZIP	Claims	Paid	Busiest year
63031	372	$5,488,817	2008 (102)
63033	155	$682,067	1979 (40)

ZIPs extend past city limits.

Most recent flood reports within 10 miles^[4]
Date	Type	Distance
Aug 12, 2025	Flash Flood	8.8 mi
Apr 4, 2025	Flash Flood	9.9 mi
Apr 4, 2025	Flash Flood	9.3 mi
Apr 4, 2025	Flood	2.4 mi
Nov 4, 2024	Heavy Rain	3.7 mi
Nov 4, 2024	Flood	3.5 mi
Sep 26, 2023	Heavy Rain	4.2 mi
Aug 4, 2022	Flash Flood	7.0 mi

When Florissant's 23,064 housing units were built^[1]
Built	Units	Share	Margin of error
2020 or later	21	0.1%	±30
2010 to 2019	99	0.4%	±70
2000 to 2009	468	2.0%	±243
1990 to 1999	413	1.8%	±190
1980 to 1989	1,411	6.1%	±289
1970 to 1979	3,024	13.1%	±429
1960 to 1969	8,874	38.5%	±764
1950 to 1959	7,443	32.3%	±742
1940 to 1949	908	3.9%	±308
1939 or earlier	403	1.7%	±167

ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.

Florissant housing and households^[1]
Measure	Value
Housing units	23,064
Detached single-family	18,162 (79%)
Occupied homes	21,229
Owner-occupied	14,240 (67%)
Renter-occupied	6,989 (33%)
Median home value	$148,800

ACS 2020–2024 estimates.

How Florissant's 21,229 occupied homes are heated^[1]
Main heating fuel	Homes	Share	Margin of error
Utility gas	17,619	83.0%	±696
Electricity	3,170	14.9%	±546
Bottled or tank gas (propane, butane, etc.)	308	1.5%	±185
Fuel oil, kerosene, etc.	37	0.2%	±62
Other fuel	33	0.2%	±49
Solar energy	28	0.1%	±40
No fuel used	22	0.1%	±32
Coal or coke	7	0.0%	±15
Wood	5	0.0%	±10

ZIP code areas covering Florissant^[6]
ZIP (ZCTA)	Share of Florissant's land	Share of the ZIP inside the city
63031	64%	53%
63033	36%	37%

Dated heat and freeze records for the ST. LOUIS forecast zone: see the county list.

Florissant plumbing questions

Are Florissant homes likely to have old galvanized pipes?

Only an inspection can say, but age is the clue: 38% were built before 1960 and 90% before 1980^[1].

How often do pipes freeze in Florissant?

The record for Florissant's forecast zone shows 12 winter-storm or freeze days over 2016–2025, in 7 different years^[4].

Which ZIP codes are covered in Florissant?

63031 and 63033^[6], in St. Louis County. Nearby suburbs with their own pages: Hazelwood (3.7 mi), University City (9.3 mi), and Maryland Heights (9.7 mi)^[3].

I rent in Florissant. Who arranges the repair?

33% of occupied Florissant homes are rented^[1], the 4th-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.

Sources

Data pulled Sep 28, 2026. Full citations and method.