Rancho Cucamonga, CA Home Safety: Home Safety 75/100
5 ZIP codes · 2 water systems · Updated
ZipCheckup grade for Rancho Cucamonga: B.
This ZIP has a few items worth a quick check.
Within Rancho Cucamonga, CA, the available records add up to an upper-tier grade; that grade describes records, not the water at a given faucet.
How Rancho Cucamonga Compares
Data: EPA SDWIS
Rancho Cucamonga Water: The Quick Version
- Homes built before 1986: 46% - older plumbing may contain lead solder.
- Health risk index (ZipCheckup composite of CDC data): 11.58.
Water Systems Serving Rancho Cucamonga
Service in Rancho Cucamonga, CA can differ by address: 2 water systems are tied to the area in federal records, and the 2 largest are listed with their violation records.
- B
- B
Overview
We track home safety data for 5 ZIP codes in Rancho Cucamonga, California (population ~174,808), covering 2 community water systems serving approximately 448,769 people region-wide. The EPA snapshots used for this build directly map water systems to 4 of 5 ZIP codes.
The available EPA record reports 0 violations for 4 ZIP codes with a reported violation count.
Home Safety Score
Average Home Safety Score for Rancho Cucamonga: B (75/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Rancho Cucamonga water systems draw from: Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: reported as 0 mg/L (a reported 0 is not proof of no lead; check the source record for its reporting limit) (EPA action level: 0.015 mg/L)
- 0 of 4 ZIP codes with known status exceed the EPA lead action level
Radon Risk
5 of 5 ZIP records with known zones are in EPA Radon Zone 2.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 91701 | B | Cucamonga Valley Water District | 211,069 |
| 91730 | B | Cucamonga Valley Water District | 211,069 |
| 91737 | B | Cucamonga Valley Water District | 211,069 |
| 91739 | B | Cucamonga Valley Water District | 211,069 |
All ZIP Codes in Rancho Cucamonga
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
CDC Health Data for Rancho Cucamonga
Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
How Old Is Rancho Cucamonga's Housing Stock?
With 46% of homes built before 1986, lead solder in plumbing is a potential concern. Federal law banned lead solder in drinking-water plumbing in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Buyers and renters in Rancho Cucamonga can ask a simple question of any home: was it built before 1986? The citywide median of 1991 will not answer it.
Most homes in Rancho Cucamonga were built after 1986; lead exposure at a tap still depends on its service line and plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Protecting Children from Lead in Rancho Cucamonga
Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical Flood-Claim Evidence for Rancho Cucamonga
Historical NFIP data for Rancho Cucamonga contains 47 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $4,745. Among ZIP codes with claim records, 75% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
Deep Dive Reports
Detailed analysis for Rancho Cucamonga, CA