Twain Harte, CA: 2 Health Violations - Home Safety 70/100
1 ZIP code · 5 water systems · Updated
ZipCheckup grade for Twain Harte: B.
This ZIP has a few items worth a quick check.
Twain Harte, CA scores in the upper band of the ZipCheckup grade.
How Twain Harte Compares
Data: EPA SDWIS
Twain Harte Water: The Quick Version
- Your city's water systems recorded 13 violations since 2021.
- Average of reported 90th-percentile lead results: 0.0126 mg/L.
- Homes built before 1986: 75% - older plumbing may contain lead solder.
- Estimated remediation: $300 per household.
- Health risk index (ZipCheckup composite of CDC data): 13.17.
Water Systems Serving Twain Harte
Federal records list 5 water systems tied to Twain Harte, CA. Of those, 3 are the primary providers, meaning service conditions, rate structures, and compliance histories can differ depending on where a property sits.
- B
- B
- B
Overview
We track home safety data for 1 ZIP code in Twain Harte, California (population ~3,663), covering 5 community water systems serving approximately 20,033 people region-wide. 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. 2 health-based violations appear in the available health breakdown.
Home Safety Score
Average Home Safety Score for Twain Harte: B (70/100)
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
Twain Harte water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0126 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 | 12 | 1 |
| Lead and Copper Rule Revisions | Treatment Technique | 10 | 1 |
| Nitrate | Inorganic | 2 | 1 |
| Lead and Copper Rule | Treatment Technique | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 95383 | B | 13 | 2 | Tud - Upper Basin Water System |
All ZIP Codes in Twain Harte
- 95383 [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.
CDC Health Data for Twain Harte
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
Key Contaminants Detected in Twain Harte
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Twain Harte's Housing Stock?
With 75% 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 Twain Harte were built before 1986; the median build year is 1973.
Over half of homes in Twain Harte 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.
Twain Harte: Remediation Cost in Perspective
Estimated remediation for Twain Harte 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 Twain Harte can be compared with local home values. The $150–$600 estimated range can be set against the median property value; actual costs vary by home. Home values are 39% below the California average.
Protecting Children from Lead in Twain Harte
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.
Lead results averaged across Twain Harte ZIP codes reach 10 ppb or more; about 75% of the housing predates 1986.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical Flood-Claim Evidence for Twain Harte
Historical NFIP data for Twain Harte contains 1 flood insurance claim. 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 $300 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 Twain Harte, CA