Rancho Cucamonga, CA Home Safety: Home Safety 75/100
5 ZIP codes · 2 water systems · Updated
ZipCheckup grade for Rancho Cucamonga: B.
This ZIP looks solid, with a few items worth a quick check.
Across Rancho Cucamonga, EPA monitoring data shows low violation rates and healthy safety margins - a pattern that places the city well above CA's average for drinking water compliance across recent reporting cycles.
How Rancho Cucamonga Compares
Data: EPA SDWIS
Rancho Cucamonga Water: The Quick Version
- Homes built before 1986: 46% - older plumbing may contain lead solder.
- Estimated remediation: $1,360 per household.
- CDC health risk index: 11.58.
Water Systems Serving Rancho Cucamonga
Rancho Cucamonga, CA is covered by 2 major water utilities out of 2 federally tracked systems, each managing its own pipes, treatment processes, and EPA filings. What a household gets from the tap depends on which provider's system serves that address.
- 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 lead level (90th percentile): 0.0000 mg/L (EPA action level: 0.015 mg/L)
- 0 of 4 ZIP codes with known status exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 5 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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). Water contamination can correlate with respiratory and chronic health conditions.
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. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Pre-1986 construction carries elevated plumbing-era lead risk because lead solder was widely used before that federal ban. In Rancho Cucamonga, the median build year of 1991 indicates a housing stock where that older fraction represents a significant share of the residential inventory.
Most homes in Rancho Cucamonga were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Rancho Cucamonga: Remediation Cost in Perspective
Equity impact data for Rancho Cucamonga lands in the favorable tier - remediation claims a small slice of what properties here are worth.
Remediation costs in Rancho Cucamonga are relatively low compared to home values. The $640–$2,240 estimated range is a small fraction of median property value. Home values are 14% above the California average.
Protecting Children from Lead in Rancho Cucamonga
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Older stock in Rancho Cucamonga represents 46% of the inventory, and citywide monitoring runs at or above the federal action level - making an in-home read a standard household-level step.
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. The <strong>$1,360</strong> remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.
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