Sonora, CA: 1 Health Violation - Home Safety 76/100
1 ZIP code · 5 water systems · Updated
ZipCheckup grade for Sonora: B.
This ZIP has a few items worth a quick check.
Within Sonora, CA, the available records add up to an upper-tier grade; that grade describes records, not the water at a given faucet.
How Sonora Compares
Data: EPA SDWIS
Key Facts for Sonora Residents
- Your city's water systems recorded 13 violations since 2021.
- Average of reported 90th-percentile lead results: 0.0047 mg/L.
- Homes built before 1986: 66% - older plumbing may contain lead solder.
- Estimated remediation: $800 per household.
- Health risk index (ZipCheckup composite of CDC data): 13.17.
Sonora's Water Providers
Among 5 systems linked to Sonora, CA, the 3 biggest by population served appear below.
- B
- B
- B
Overview
We track home safety data for 1 ZIP code in Sonora, California, covering 5 community water systems serving approximately 28,373 people. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.
1 of 1 ZIP code with a reported violation count in the available EPA record (100%) have recorded EPA violations. 1 health-based violation appear in the available health breakdown.
Home Safety Score
Average Home Safety Score for Sonora: B (76/100)
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
Sonora water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0047 mg/L (EPA action level: 0.015 mg/L)
- 0 of 1 ZIP code with known status exceed the EPA lead action level
Radon Risk
1 of 1 ZIP records with known zones is 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 |
|---|---|---|---|
| Revised Total Coliform Rule | Microbiological | 18 | 1 |
| Nitrate | Inorganic | 4 | 1 |
| Lead and Copper Rule Revisions | Treatment Technique | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 95370 | B | 13 | 1 | Tud - Sonora/jamestown Water System |
All ZIP Codes in Sonora
- 95370 [B] - 13 violations ⚠
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.
Sonora Community Health Snapshot
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
What's in Sonora's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Sonora Infrastructure Age
With 66% 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
If you live in one of the pre-1986 homes in Sonora, a certified lab test for lead is the direct way to learn what your tap delivers; the median build year of 1971 is only context.
Over half of homes in Sonora 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.
How Remediation Costs Compare in Sonora
Relative to home values, Sonora remediation estimates run low.
Estimated remediation costs in Sonora can be compared with local home values. The $450–$1,400 estimated range can be set against the median property value; actual costs vary by home. Home values are 44% below the California average.
Sonora: Lead Risk & Vulnerable Populations
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.
Sonora: NFIP Claim Records and Water-Quality Context
Historical NFIP data for Sonora contains 14 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $17,080. 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 $800 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 Sonora, CA