Water damage restoration · Rancho Cucamonga, California
Water damage restoration in Rancho Cucamonga, CA
Burst pipe, failed water heater, or storm water? Rancho Cucamonga-area ZIPs: 47 flood claims since 1978[1]; 29% of homes built before 1980[2]. Request help from local restoration crews. Rancho Cucamonga, in San Bernardino County — ZIPs 91730, 91739, 91701, 91737, counts 177,856 residents (2025 estimate)[3].
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The Rancho Cucamonga water damage picture in brief
- Population (2025 est.)
- 177,856[3]+1.9% since 2020
- County
- San Bernardino[3]
- Land area
- 46.5 sq mi[4]
- Flood-insurance (NFIP) claims, local ZIPs
- 47 since 1978[1]$132,862 paid across 28 claims · ZIP 91730, 91739, 91701, 91737
- Flood & flash-flood reports within 10 mi
- 51[5]2016–2025 · latest Dec 24, 2025
- Federal disaster declarations incl. flooding, San Bernardino Co.
- 9[6]of 40 total declarations
- Homes built before 1980
- 29%[2]the 6th-highest share of the 15 Inland Empire suburbs we cover
- Households renting
- 38%[2]2020–2024
What Rancho Cucamonga's numbers say about water damage
Rancho Cucamonga is one of the most established suburbs tracked here — 177,856 people (2025 estimate), up just 1.9% since 2020[3]. 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[4].
Rancho Cucamonga mixes 8% of homes built since 2010 and 29% before 1980[2]: new supply lines and water heaters in one house, aging pipe and original valves in the next — so where a leak starts depends a lot on the address.
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)[7].
The tracked suburbs closest by are Fontana (6.1 mi E), Ontario (6.8 mi S) and Rialto (10.2 mi E)[4].
47 flood-insurance claims have come from Rancho Cucamonga-area ZIP codes (91730, 91739, 91701, 91737) since 1978, and $132,862 has been paid on them (about $4,745 per paid claim)[1]. 1993 was the worst year, with 10 claims. That is the most of the 15 Inland Empire suburbs we cover; for comparison, Fontana (23), Ontario (21), and Rialto (6). Outside water is a real part of the picture here. Of the 40 claims rated in a flood zone, 26 were in FEMA's high-risk areas (zones A or V) and 13 outside them (zones B, C or X), with 1 in undetermined zone D[1][8] — flooding here is not only a high-risk-zone problem.
By month of loss, Rancho Cucamonga-area flood claims cluster in January (18), February (14), and April (4) — 36 of 47 dated claims[1].
Within 10 miles of central Rancho Cucamonga, weather observers filed 51 flood, flash-flood or heavy-rain reports in 2016–2025 (18 flash floods)[5]. Countywide: 9 flood declarations since 2000, latest Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides (DR-4699, 2023)[6]. Nearby: Fontana (53), Ontario (45), and Rialto (51).
29% of Rancho Cucamonga's 60,879 housing units predate 1980[2] — the 6th-highest share of the 15 Inland Empire suburbs we cover (Fontana (28%), Ontario (50%), and Rialto (44%)). Expect a mix of original and replaced plumbing.
62% of Rancho Cucamonga households own their home[2], so most claims and rebuilds here are coordinated by the owner.
Out of the 15 suburbs on this site, Rancho Cucamonga has the most NFIP flood claims (47)[1], the 2nd-most flood reports nearby (51, tied with Rialto)[5], and the 3rd-highest median home value ($740,200)[2].
How a leak spreads inside a wall
Give a leak time and it travels — outward across the floor, upward into drywall by capillary action.
Rancho Cucamonga storm calendar
Within 10 miles of Rancho Cucamonga, 2016–2025: 18 flash-flood reports, 13 flood reports, and 20 heavy-rain reports[5]. 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 | 1 | 6 | 9 |
| Mar | 2 | 5 | 2 | 9 |
| Apr | – | – | 1 | 1 |
| May | 5 | 2 | 1 | 8 |
| Aug | – | 1 | – | 1 |
| Sep | 1 | – | 3 | 4 |
| Oct | – | – | 1 | 1 |
| Nov | 3 | 3 | 3 | 9 |
| Dec | 3 | – | 3 | 6 |
Finding water damage help around Rancho Cucamonga
Requests go to Water damage restoration contractors serving the Rancho Cucamonga area — ZIP codes 91730, 91739, 91701, 91737.
Before you pick up the phone: what a restoration crew does first
Shared walls and ceilings: Rancho Cucamonga homes by building type
35%[2] of Rancho Cucamonga's homes share walls, floors or ceilings with a neighbour (multi-unit buildings alone: 28%, the 3rd-highest multi-unit share of the 15 Inland Empire suburbs we cover). Water crosses those lines: in an attached or stacked unit, tell the neighbour and the association or landlord right away, and check whose policy covers which part of the damage.
After detached houses, the biggest group is 50 or more units: 7,389 of 60,879 housing units[2].
Rancho Cucamonga also has 1,386 mobile homes (2.3%); for a leak under one, ask for a crew that works on manufactured homes.
| Building type | Units | Share | Margin of error |
|---|---|---|---|
| Detached house | 38,025 | 62.5% | ±1,048 |
| Attached house (townhouse, rowhouse) | 4,691 | 7.7% | ±533 |
| Duplex (2 units) | 491 | 0.8% | ±186 |
| 3–4 units | 3,211 | 5.3% | ±568 |
| 5–9 units | 3,142 | 5.2% | ±591 |
| 10–19 units | 1,245 | 2.0% | ±279 |
| 20–49 units | 1,288 | 2.1% | ±352 |
| 50 or more units | 7,389 | 12.1% | ±762 |
| Mobile home | 1,386 | 2.3% | ±270 |
| Boat, RV, van, etc. | 11 | 0.0% | ±26 |
Margins of error are the Census Bureau’s 90% intervals; small categories in small cities are rough.
The data underneath this Rancho Cucamonga page
| Measure | Rancho Cucamonga | Median of 15 | Difference |
|---|---|---|---|
| NFIP flood claims (area ZIPs) | 47 | 21 | 26 more |
| Flood reports (10 mi) | 51 | 34 | 17 more |
| Median home value | $740,200 | $618,900 | 20% higher |
| Built before 1980 | 29% | 25% | 4 pts higher |
| Renter-occupied | 38% | 36% | 2 pts higher |
| Owner-occupied | 62% | 64% | 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 | NFIP claims | Flood reports ≤10 mi | Built before 1980 | Renting |
|---|---|---|---|---|
| Rancho Cucamonga | 47 | 51 | 29% | 38% |
| Fontana 6.1 mi | 23 | 53 | 28% | 33% |
| Ontario 6.8 mi | 21 | 45 | 50% | 42% |
| Rialto 10.2 mi | 6 | 51 | 44% | 34% |
| Eastvale 11.6 mi | 29 | 46 | 2% | 22% |
| Chino 12.2 mi | 5 | 44 | 38% | 36% |
| ZIP | Claims | Paid | Busiest year | Outside high-risk zones |
|---|---|---|---|---|
| 91730 | 12 | $14,461 | 1993 (3) | 1 of 11 |
| 91739 | 10 | $37,857 | 2004 (3) | 1 of 9 |
| 91701 | 20 | $57,886 | 1993 (5) | 8 of 17 |
| 91737 | 5 | $22,658 | 1980 (2) | 3 of 3 |
ZIPs extend past city limits. Outside high-risk zones: claims rated in zone B, C or X, of the claims that carry a zone.
| Year | Claims |
|---|---|
| 2019 | 2 |
| 2017 | 2 |
| 2016 | 2 |
| 2005 | 3 |
| 2004 | 5 |
| 2001 | 1 |
| 1998 | 2 |
| 1996 | 2 |
| 1995 | 1 |
| 1994 | 1 |
| 1993 | 10 |
| 1992 | 4 |
| Month | Claims |
|---|---|
| January | 18 |
| February | 14 |
| March | 3 |
| April | 4 |
| June | 1 |
| October | 4 |
| November | 1 |
| December | 2 |
| 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 |
| 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% |
water damage questions from Rancho Cucamonga homeowners
Do I need flood insurance in Rancho Cucamonga?
Homeowners policies exclude outside floodwater[9], and Rancho Cucamonga-area ZIPs have 6 NFIP claims in just the last ten years[1].
Which Rancho Cucamonga ZIP codes do these crews cover?
91730, 91739, 91701, and 91737[7], in San Bernardino County. Nearby pages: Fontana (6.1 mi), Ontario (6.8 mi), and Rialto (10.2 mi)[4].
Which Rancho Cucamonga ZIP code has the most flood claims?
91701, with 20 NFIP claims and $57,886 paid[1].
When was the last flood report near Rancho Cucamonga?
Dec 24, 2025: a flash flood report 9.8 miles from the city center[5].
I rent in Rancho Cucamonga. Who arranges the repair?
38% of occupied Rancho Cucamonga homes are rented[2], 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
- OpenFEMA NFIP claims
- Census ACS 2020–2024 5-year (keyless bulk)
- Census population estimates, Vintage 2025
- Census Gazetteer 2025
- NOAA Storm Events Database
- OpenFEMA disaster declarations
- Census 2020 ZCTA–place file
- FEMA, Flood Zones (link unverified)
- FEMA FloodSmart (link unverified)
Data pulled Sep 28, 2026. Full citations and method.