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.
If you're checking Rialto, CA tap water safety, the short answer is: average - violations are present in parts of the city and specifics depend on which water system serves your address.
How Rialto Compares
Data: EPA SDWIS
What You Should Know About Rialto Water
- Your city's water systems recorded 1 violation in the past 5 years.
- Homes built before 1986: 58% - older plumbing may contain lead solder.
- Estimated remediation: $2,200 per household.
- CDC health risk index: 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 lead level (90th percentile): 0.0000 mg/L (EPA action level: 0.015 mg/L)
- 0 of 2 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): 2 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Lead | 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). Water contamination can correlate with respiratory and chronic health conditions.
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. 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
Plumbing risk in older housing is defined by two eras: the pre-1970 period when lead pipes were commonly used for service lines, and the 1970-to-1986 period when lead solder remained standard in copper plumbing until the federal ban. Rialto's median build year of 1977 lands in a range where both eras are heavily represented in the housing stock. That creates an elevated aggregate environment for plumbing-related lead exposure - one that city-level water quality averages don't capture, because the risk sits inside individual properties rather than in the distribution system.
Over half of homes in Rialto were built before 1986, when lead solder was banned. 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
At current valuations, Rialto sits in the low remediation-share tier - the equity impact of fixing documented issues is proportionally minor.
Remediation costs in Rialto are relatively low compared to home values. The $1,200–$3,400 estimated range is a small fraction of median property value. Home values are 25% below the California average.
Lead Exposure Risk for Children in Rialto
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.
In recent monitoring under the Lead and Copper Rule, citywide samples for Rialto have approached or crossed the regulatory action level on multiple occasions. Combined with 58% of stock dating from the pre-rule era, the picture supports baseline single-tap reads as a standard household-level step.
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 <strong>$2,200</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.
What You Can Do in Rialto
- Test your water at home. City-level data shows averages - your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Lead can reduce the most common contaminant found in Rialto's water.
- 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