Castro Valley, CA - Home Safety Score unavailable
2 ZIP codes · 5 water systems · Updated
Data: EPA SDWIS
What You Should Know About Castro Valley Water
- Your city's water systems recorded 2 violations since 2021.
- Average of reported 90th-percentile lead results: 0.0034 mg/L.
- Homes built before 1986: 65% - older plumbing may contain lead solder.
- Estimated remediation: $650 per household.
- Health risk index (ZipCheckup composite of CDC data): 9.67.
Who Supplies Your Water in Castro Valley
More than one public water system is linked to Castro Valley, CA: federal records tie 5 systems to the area, and the 3 with the largest reported service populations are shown below. Which of them supplies a particular address depends on where the property sits, and a water bill or the utility can confirm it.
Overview
We track home safety data for 2 ZIP codes in Castro Valley, California (population ~60,207), covering 5 community water systems serving approximately 2,048,570 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. 1 health-based violation appear in the available health breakdown.
Water Sources
Castro Valley water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0034 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
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 |
|---|---|---|---|
| Lead and Copper Rule Revisions | Treatment Technique | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 94552 | — | 2 | 1 | East Bay Municipal Utility District |
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 94546 | — | East Bay Municipal Utility District | 1,442,800 |
All ZIP Codes in Castro Valley
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 Castro Valley
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 Castro Valley Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Castro Valley
With 65% 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 Castro Valley were built before 1986; the median build year is 1975.
Over half of homes in Castro Valley 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 Castro Valley Homeowners
Here the gap between local home values and the estimated repair bill is wide, so the percentage shown below for Castro Valley stays at or under the 1% mark.
Estimated remediation costs in Castro Valley can be compared with local home values. The $375–$1,100 estimated range can be set against the median property value; actual costs vary by home. Home values are 74% above the California average.
Lead Exposure Risk for Children in Castro Valley
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 Castro Valley
Historical NFIP data for Castro Valley contains 36 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $18,140. 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 $650 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 Castro Valley, CA