Plumbing repair · Rancho Cucamonga, California
Plumbing repair in Rancho Cucamonga, CA
Leak, backed-up drain, no hot water, or a frozen line? The largest share of Rancho Cucamonga's homes (27%) was built 1980 to 1989[1]. Request a licensed plumber who works here. Rancho Cucamonga, in San Bernardino County — ZIPs 91730, 91739, 91701, 91737, counts 177,856 residents (2025 estimate)[2].
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Rancho Cucamonga at a glance for plumbing
- Population (2025 est.)
- 177,856[2]+1.9% since 2020
- County
- San Bernardino[2]
- Land area
- 46.5 sq mi[3]
- Decade the most homes date from
- 1980 to 1989[1]27% of housing units
- Homes built before 1980
- 29%[1]the 6th-highest share of the 15 Inland Empire suburbs we cover
- Homes built 1980–1999
- 41%[1]2020–2024
- Homes built 2010 or later
- 8%[1]the 6th-lowest share of the 15 Inland Empire suburbs we cover
- Flood & flash-flood reports within 10 mi
- 51[4]18 flash floods, 2016–2025; flood-prone homes need working drainage and backflow prevention
- FEMA flood-insurance claims, local ZIPs
- 47[5]6 in the last 10 years; 28 paid
- Homes on utility gas heat
- 74%[1]gas piping work usually needs a permit and a licensed installer
What Rancho Cucamonga's numbers say about plumbing
Rancho Cucamonga is one of the most established suburbs tracked here — 177,856 people (2025 estimate), up just 1.9% since 2020[2]. On the map that's 46.5 square miles holding 3,823 residents per square mile, the 6th densest of the suburbs here; it sits entirely in San Bernardino County, with ZIP codes 91730, 91739, 91701, 91737[3].
With 8% of homes built since 2010 and 29% before 1980[1], Rancho Cucamonga's plumbing runs from brand-new supply lines and fixtures to aging pipe, original valves and water heaters past their rated life.
Mail to Rancho Cucamonga goes through 4 ZIP codes — 91730 (34% of the city's land), 91739 (31% of the city's land), 91701 (18% of the city's land), 91737 (16% of the city's land)[6].
Nearest of the other suburbs we track: Fontana (6.1 mi E), Ontario (6.8 mi S) and Rialto (10.2 mi E)[3].
29% of Rancho Cucamonga's 60,879 housing units predate 1980 and 8% went up in 2010 or later[1] — the 6th-highest pre-1980 share of the 15 Inland Empire suburbs we cover; nearby, Fontana (28%), Ontario (50%), and Rialto (44%) predate 1980. The 41% built in 1980–1999 are at the age where original water heaters and valves get replaced.
The biggest single slice — 27% — was built 1980 to 1989, and the median home dates to 1988[1]. Neighbours from the same era tend to hit the same plumbing problems at the same time.
Water from the sky is plumbing work too: 51 flood or flash-flood reports within 10 miles over 2016–2025[4], and FEMA logged 47 flood-insurance claims across Rancho Cucamonga's ZIPs[5]. Homes that take water need working drainage, sump pumps and backflow prevention.
74% of homes heat with utility gas, and 38% of households rent[1]. Tenants: report plumbing failures to the landlord in writing.
Measured against the 15 suburbs on this site, Rancho Cucamonga records the 2nd-most flood reports nearby (51, tied with Rialto)[4].
Rancho Cucamonga storm calendar
Within 10 miles of Rancho Cucamonga, 2016–2025: 18 flash-flood reports and 33 flood or heavy-rain reports[4]. Peak: spread out; February, March, and November held 53%. Busiest year 2025 (12). Busiest month February 2025 (6). Latest: flash-flood report, Dec 24, 2025, 9.8 mi out.
| Month | Flash flood | Flood & heavy rain | All |
|---|---|---|---|
| Jan | 2 | 1 | 3 |
| Feb | 2 | 7 | 9 |
| Mar | 2 | 7 | 9 |
| Apr | – | 1 | 1 |
| May | 5 | 3 | 8 |
| Aug | – | 1 | 1 |
| Sep | 1 | 3 | 4 |
| Oct | – | 1 | 1 |
| Nov | 3 | 6 | 9 |
| Dec | 3 | 3 | 6 |
plumbing help in Rancho Cucamonga: what to do next
Your request reaches Plumbing repair contractors who serve Rancho Cucamonga (ZIP codes 91730, 91739, 91701, 91737).
Before reaching out: before the plumber arrives
The Rancho Cucamonga numbers behind this page
| Measure | Rancho Cucamonga | Median of 15 | Difference |
|---|---|---|---|
| Flood reports (10 mi) | 51 | 34 | 17 more |
| Built before 1960 | 4.4% | 6.5% | 2 pts lower |
| Built 2010 or later | 8% | 10% | 2 pts lower |
| Built before 1980 | 29% | 25% | 4 pts higher |
| Renter-occupied | 38% | 36% | 2 pts higher |
| Utility-gas heat | 74% | 76% | 2 pts lower |
| Median year built | 1988 | 1989 | 1 year older |
Biggest gaps first. Medians are middle values across the Inland Empire suburbs we cover, drawn from the same sources.
| City | Flood reports | NFIP claims |
|---|---|---|
| Rancho Cucamonga | 51 | 47 |
| Fontana 6.1 mi | 53 | 23 |
| Ontario 6.8 mi | 45 | 21 |
| Rialto 10.2 mi | 51 | 6 |
| Eastvale 11.6 mi | 46 | 29 |
| Chino 12.2 mi | 44 | 5 |
| ZIP | Claims | Paid | Busiest year |
|---|---|---|---|
| 91730 | 12 | $14,461 | 1993 (3) |
| 91739 | 10 | $37,857 | 2004 (3) |
| 91701 | 20 | $57,886 | 1993 (5) |
| 91737 | 5 | $22,658 | 1980 (2) |
ZIPs extend past city limits.
| Date | Type | Distance |
|---|---|---|
| Dec 24, 2025 | Flash Flood | 9.8 mi |
| Nov 16, 2025 | Flood | 5.4 mi |
| Nov 15, 2025 | Heavy Rain | 9.3 mi |
| Nov 15, 2025 | Heavy Rain | 2.8 mi |
| Mar 13, 2025 | Heavy Rain | 9.9 mi |
| Mar 4, 2025 | Heavy Rain | 5.8 mi |
| Feb 14, 2025 | Heavy Rain | 5.9 mi |
| Feb 14, 2025 | Heavy Rain | 4.2 mi |
| Built | Units | Share | Margin of error |
|---|---|---|---|
| 2020 or later | 844 | 1.4% | ±238 |
| 2010 to 2019 | 3,999 | 6.6% | ±516 |
| 2000 to 2009 | 13,493 | 22.2% | ±820 |
| 1990 to 1999 | 8,713 | 14.3% | ±690 |
| 1980 to 1989 | 16,157 | 26.5% | ±850 |
| 1970 to 1979 | 11,836 | 19.4% | ±665 |
| 1960 to 1969 | 3,140 | 5.2% | ±416 |
| 1950 to 1959 | 1,753 | 2.9% | ±337 |
| 1940 to 1949 | 242 | 0.4% | ±136 |
| 1939 or earlier | 702 | 1.2% | ±209 |
ACS 2020–2024 estimates; margins of error are the Census Bureau's 90% intervals.
| Measure | Value |
|---|---|
| Housing units | 60,879 |
| Detached single-family | 38,025 (62%) |
| Occupied homes | 58,835 |
| Owner-occupied | 36,654 (62%) |
| Renter-occupied | 22,181 (38%) |
| Median home value | $740,200 |
ACS 2020–2024 estimates.
| Main heating fuel | Homes | Share | Margin of error |
|---|---|---|---|
| Utility gas | 43,639 | 74.2% | ±1,034 |
| Electricity | 12,521 | 21.3% | ±839 |
| Bottled or tank gas (propane, butane, etc.) | 1,093 | 1.9% | ±301 |
| No fuel used | 827 | 1.4% | ±280 |
| Solar energy | 532 | 0.9% | ±171 |
| Wood | 101 | 0.2% | ±79 |
| Other fuel | 48 | 0.1% | ±38 |
| Fuel oil, kerosene, etc. | 46 | 0.1% | ±42 |
| Coal or coke | 28 | 0.0% | ±31 |
| ZIP (ZCTA) | Share of Rancho Cucamonga's land | Share of the ZIP inside the city |
|---|---|---|
| 91730 | 34% | 100% |
| 91739 | 31% | 43% |
| 91701 | 18% | 100% |
| 91737 | 16% | 63% |
Common Rancho Cucamonga plumbing questions
Are Rancho Cucamonga homes likely to have old galvanized pipes?
Only an inspection can say, but age is the clue: 4% were built before 1960 and 29% before 1980[1].
Which ZIP codes are covered in Rancho Cucamonga?
91730, 91739, 91701, and 91737[6], in San Bernardino County. Nearby suburbs with their own pages: Fontana (6.1 mi), Ontario (6.8 mi), and Rialto (10.2 mi)[3].
I rent in Rancho Cucamonga. Who arranges the repair?
38% of occupied Rancho Cucamonga homes are rented[1], the 4th-highest share of the 15 Inland Empire suburbs we cover. Tell your landlord or property manager in writing first; your lease says who arranges repairs.
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.