Rialto, CA: 1 Violation - Home Safety 58/100
2 ZIP codes · 5 water systems · Updated
ZipCheckup grade for Rialto: C.
A mixed picture - some signals here are worth your attention.
Neither high nor low, the composite grade for Rialto, CA is a C, built from ZIP-level scores.
How Rialto Compares
Data: EPA SDWIS
What You Should Know About Rialto Water
- Water systems mapped to your city have 1 violation on record since 2021.
- Homes built before 1986: 58% - older plumbing may contain lead solder.
- Estimated remediation: $500 per household.
- Health risk index (ZipCheckup composite of CDC data): 11.58.
Who Supplies Your Water in Rialto
Federal records list 5 water systems tied to Rialto, CA. Of those, 3 are the primary providers, meaning service conditions, rate structures, and compliance histories can differ depending on where a property sits.
- C
- C
- C
Overview
We track home safety data for 2 ZIP codes in Rialto, California (population ~105,846), covering 5 community water systems serving approximately 657,841 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 2 ZIP codes.
1 of 2 ZIP codes with a reported violation count in the available EPA record (50%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.
Home Safety Score
Average Home Safety Score for Rialto: C (58/100)
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
Rialto water systems draw from: Groundwater, 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 2 ZIP codes with known status exceed the EPA lead action level
Radon Risk
2 of 2 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.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Nitrate | Inorganic | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 92376 | C | 1 | 0 | City of Rialto, |
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 92377 | C | West Valley Water District | 104,498 |
All ZIP Codes in Rialto
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.
Health Outcomes in Rialto
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
Top Contaminants in Rialto Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Rialto
With 58% 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
By Census estimates, roughly half or more of the homes in Rialto were built before 1986; the median build year is 1977.
Over half of homes in Rialto were built before 1986, when federal law began restricting lead solder in drinking-water plumbing. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Rialto Homeowners
Estimated remediation for Rialto is a small fraction of median property value - one percent or less - though the ratio does not describe any single household.
Estimated remediation costs in Rialto can be compared with local home values. The $300–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 25% below the California average.
Lead Exposure Risk for Children in Rialto
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 NFIP Claim Context in Rialto
Historical NFIP data for Rialto contains 5 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $1,427. Among ZIP codes with claim records, 0% 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 $500 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.
What You Can Do in Rialto
- Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
- Install a certified water filter. For Nitrate, listed in the water-quality records for Rialto: if it is a rule or reporting requirement rather than a contaminant, ask your utility what the record involved; for bacteria, follow any boil-water notice from your utility; for a specific chemical contaminant, check whether a filter is certified to reduce it. Not every contaminant has a consumer filter certification.
- Check your home's plumbing. With 58% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Rialto, CA