Mission Viejo, CA: 1 Violation - Home Safety 91/100
3 ZIP codes · 6 water systems · Updated
ZipCheckup grade for Mission Viejo: A.
No federal data flags a major home-safety concern for this ZIP.
Drinking water tracked for Mission Viejo by CA authorities posts above-average scores - the majority of systems are free from health-based exceedances and the city's grade sits above the state median.
How Mission Viejo Compares
Data: EPA SDWIS
What You Should Know About Mission Viejo Water
- Your city's water systems recorded 1 violation in the past 5 years.
- Average lead level: 0.0024 mg/L.
- Homes built before 1986: 68% - older plumbing may contain lead solder.
- Estimated remediation: $1,700 per household.
- CDC health risk index: 10.23.
Who Supplies Your Water in Mission Viejo
Throughout Mission Viejo, CA, water comes from one of 3 primary utilities out of 6 total systems - independent providers with different rate structures, infrastructure, and compliance records that vary across the service territory.
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Overview
We track home safety data for 3 ZIP codes in Mission Viejo, California (population ~93,186), covering 6 community water systems serving approximately 888,468 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 3 ZIP codes.
2 of 2 ZIP codes with a reported violation count in the available EPA record (100%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.
Home Safety Score
Average Home Safety Score for Mission Viejo: A (91/100)
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
Mission Viejo water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0024 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 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 3 ZIP codes
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 3 | 2 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 92691 | A | 1 | 0 | Moulton Niguel Water District |
| 92692 | A | 1 | 0 | Santa Margarita Water District |
All ZIP Codes in Mission Viejo
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 Mission Viejo
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 Mission Viejo Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Mission Viejo
With 68% 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
The character of Mission Viejo's housing stock is one of deep historical layering - a median build year of 1979 signals a city built largely before the plumbing era changes of 1986 and 1970. Lead-soldered copper joints and, in the oldest properties, lead service lines are commonly present in this inventory. That context shapes what individual water testing may reveal, particularly in neighborhoods where the oldest housing is concentrated.
Over half of homes in Mission Viejo 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 Mission Viejo Homeowners
What does remediation cost in financial context for Mission Viejo homeowners? Proportionally very little - the equity share here is low, and addressing documented issues is a manageable planning question rather than a material financial burden.
Remediation costs in Mission Viejo are relatively low compared to home values. The $1,100–$2,600 estimated range is a small fraction of median property value. Home values are 33% above the California average.
Lead Exposure Risk for Children in Mission Viejo
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.
Confirming what arrives at a specific faucet is something utility-side averages cannot do. With 68% of Mission Viejo stock built before the lead-solder ban and citywide monitoring at or beyond the regulatory mark, a tap-level kit fits the standard diligence picture.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in Mission Viejo
Historical NFIP data for Mission Viejo contains 13 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $18,698. 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>$1,700</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.
Deep Dive Reports
Detailed analysis for Mission Viejo, CA