CITY REPORT CA

Aliso Viejo, CA Home Safety: Home Safety 92/100

2 ZIP codes · 2 water systems · Updated

ZipCheckup grade for Aliso Viejo: A.

Checked records flag no major concern; missing data is unknown.

Aliso Viejo, CA scores in the upper band of the ZipCheckup grade.

How Aliso Viejo Compares

Aliso Viejo92/100
California avg76/100
National avg73/100

Data: EPA SDWIS

2
ZIP Codes
2
Water Systems
0
ZIPs Linked to Systems with Violations
A · 92
Avg Safety Score
Zone 3
County Radon Potential (Low)
$850K
Median Home Value
$500
Est. Remediation (0.1% of home value)

What You Should Know About Aliso Viejo Water

  • Average of reported 90th-percentile lead results: 0.0008 mg/L.
  • Estimated remediation: $500 per household.
  • Health risk index (ZipCheckup composite of CDC data): 10.23.

Who Supplies Your Water in Aliso Viejo

More than one public water system is linked to Aliso Viejo, CA: federal records tie 2 systems to the area, and the 2 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 Aliso Viejo, California (population ~52,645), covering 2 community water systems serving approximately 222,036 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 2 ZIP codes.

The available EPA record reports 0 violations for 1 ZIP code with a reported violation count.

Home Safety Score

Average Home Safety Score for Aliso Viejo: A (92/100)

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

Aliso Viejo water systems draw from: Surface water.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0008 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

2 of 2 ZIP records with known zones are in EPA Radon Zone 3.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

Areas with No Violations

ZIP Code Safety Score System Population
92656 A Moulton Niguel Water District 170,236

All ZIP Codes in Aliso Viejo

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Health Outcomes in Aliso Viejo

9%
Asthma (US: 9.8%)
11.5%
Diabetes (US: 10.4%)
16%
Poor Mental Health (US: 14.8%)

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

Asthma 9% ↓
Diabetes 11.5% ↑
Mental Health 16% ↑

Vertical line = national average. ■ Above national · ■ Below national

Cost Context: What Remediation Means for Aliso Viejo Homeowners

Here the gap between local home values and the estimated repair bill is wide, so the percentage shown below for Aliso Viejo stays at or under the 1% mark.

Median Home Value
$849,900
Est. Remediation
$500
Remediation as % of home value 0.1%

Estimated remediation costs in Aliso Viejo can be compared with local home values. The $300–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 15% above the California average.

Lead Exposure Risk for Children in Aliso Viejo

0.0008
mg/L average of reported water-system 90th-percentile lead results (the 0.015 action level applies to each system's result, not to this average)

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.

Available area-level lead records for Aliso Viejo do not determine the lead level at an individual tap. Testing is the only way to confirm your water's lead content.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Historical NFIP Claim Context in Aliso Viejo

4
Total FEMA Flood Claims
$8,576
Avg Reported Sum With Payment Data
0%
A/V Share of Claim-Record ZIPs

Historical NFIP data for Aliso Viejo contains 4 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $8,576. 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 $500 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 Aliso Viejo, CA

Frequently Asked Questions

What does the Home Safety Score mean for Aliso Viejo, CA?
Aliso Viejo has an average Home Safety Score of 92/100 (Grade A) under ZipCheckup model 4.0.0, an area-level model that draws on EPA water compliance records, PFAS screening, EPA radon zones, and annual EPA air quality data; see the methodology page for how inputs and coverage are handled. The available EPA record reports no violations for ZIP codes with reported counts. Check individual ZIP code reports for component details.
Does Aliso Viejo water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of Aliso Viejo is 0.0008 mg/L. The EPA action level of 0.015 mg/L applies to each water system's own 90th percentile, not to this average. EPA's health goal for lead is zero. Lead levels can vary by home - testing is recommended especially in older properties.
How does Aliso Viejo compare to California average?
Aliso Viejo has an average Home Safety Score of 92/100, which is at or above the California state average of 76/100 for the same model series.
How many water systems serve Aliso Viejo?
Our records map 2 water systems to 2 ZIP codes in Aliso Viejo. The related population figure in our data is approximately 52,645 people; it is not a count of people served citywide.
How much does it cost to fix water issues in Aliso Viejo?
Estimated remediation cost per household in Aliso Viejo: $500; modeled range $300 to $800. Estimated costs may include filtration, pipe replacement, radon mitigation, or flood protection where applicable.
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How to cite this page

APA ZipCheckup. (2026). Aliso Viejo, CA Home Safety: Home Safety 92/100. https://zipcheckup.com/cities/ca/aliso-viejo/
BibTeX 
@misc{zipcheckup-cities-ca-aliso-viejo,
  author = {{ZipCheckup}},
  title  = {{Aliso Viejo, CA Home Safety: Home Safety 92/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/ca/aliso-viejo/}
}

Page version: October 2026.

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