CITY REPORT FL

Key Biscayne, FL: 6 Violations - Home Safety 66/100

1 ZIP code · 1 water system · Updated

ZipCheckup grade for Key Biscayne: C.

A mixed picture - some signals here are worth your attention.

Documented records place Key Biscayne, FL in the middle grade tier.

How Key Biscayne Compares

Key Biscayne66/100
Florida avg80/100
National avg73/100

Data: EPA SDWIS

1
ZIP Codes
1
Water Systems
1
ZIPs Linked to Systems with Violations
C · 66
Avg Safety Score
Zone 2
County Radon Potential (Moderate)
$1.2M
Median Home Value
$600
Est. Remediation (0.1% of home value)

Key Biscayne Water: The Quick Version

  • Your city's water systems recorded 6 violations since 2021.
  • Average of reported 90th-percentile lead results: 0.0031 mg/L.
  • Homes built before 1986: 64% - older plumbing may contain lead solder.
  • Estimated remediation: $600 per household.
  • Health risk index (ZipCheckup composite of CDC data): 11.77.

Water Systems Serving Key Biscayne

Only a single entry appears in the water system list for Key Biscayne, FL; federal records tie 1 to the area.

Overview

We track home safety data for 1 ZIP code in Key Biscayne, Florida (population ~14,628), covering 1 community water system serving approximately 2,377,460 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. The available record reports no health-based violations for this measured scope.

Home Safety Score

Average Home Safety Score for Key Biscayne: C (66/100)

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

Key Biscayne water systems draw from: Groundwater.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0031 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
Haloacetic Acids (HAA5) Disinfection Byproducts 4 1
Total Trihalomethanes (TTHM) Disinfection Byproducts 4 1
Revised Total Coliform Rule Microbiological 4 1

Areas with Most Violations

ZIP Code Safety Score Violations Health-Based System
33149 C 6 0 Mdwasa - Main System

All ZIP Codes in Key Biscayne

  • 33149 [C] - 6 violations

Data Sources

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

CDC Health Data for Key Biscayne

8.5%
Asthma (US: 9.8%)
15.4%
Diabetes (US: 10.4%)
14.4%
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 8.5% ↓
Diabetes 15.4% ↑
Mental Health 14.4% ↓

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

Key Contaminants Detected in Key Biscayne

Haloacetic Acids (HAA5) 4 violations
Disinfection Byproducts · EPA regulatory level for the contaminant named above: 0.06 mg/L
Increased cancer risk with long-term exposure above the MCL
Total Trihalomethanes (TTHM) 4 violations
Disinfection Byproducts · EPA regulatory level for the contaminant named above: 0.08 mg/L
Increased cancer risk with long-term exposure above the MCL
Revised Total Coliform Rule 4 violations
Microbiological
Indicates possible bacterial contamination

Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.

How Old Is Key Biscayne's Housing Stock?

1971
Median Build Year
64%
Built Before 1986
21%
Built Before 1970
Copper
Likely Pipe Material

With 64% 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

Lead can reach tap water from service lines, solder and brass fittings inside a building, which is why housing age draws attention in Key Biscayne, where the median build year is 1971.

1971
Median Year Built
64%
Pre-1986 (lead solder era; lead paint banned 1978)
21%
Pre-1970 (Lead Pipes Risk)
Pre-1970 (21%) 1970–1986 (43%) Post-1986 (36%)

Over half of homes in Key Biscayne 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.

Key Biscayne: Remediation Cost in Perspective

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

Median Home Value
$1.2M
Est. Remediation
$600
Remediation as % of home value 0.1%

Estimated remediation costs in Key Biscayne can be compared with local home values. The $400–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 264% above the Florida average.

Protecting Children from Lead in Key Biscayne

64%
Homes Built Before 1986
0.0031
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.

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 Flood-Claim Evidence for Key Biscayne

1,832
Total FEMA Flood Claims
$42,494
Avg Reported Sum With Payment Data
100%
A/V Share of Claim-Record ZIPs

Historical NFIP data for Key Biscayne contains 1,832 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $42,494. Among ZIP codes with claim records, 100% 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 $600 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.

What You Can Do in Key Biscayne

  1. Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
  2. Install a certified water filter. For Haloacetic Acids (HAA5), listed in the water-quality records for Key Biscayne: if it is a rule or reporting requirement rather than a contaminant, ask your utility what the record involved; for bacteria, follow any boil-water notice from your utility; for a specific chemical contaminant, check whether a filter is certified to reduce it. Not every contaminant has a consumer filter certification.
  3. Check your home's plumbing. With 64% of homes built before 1986, lead solder is a real possibility.

Deep Dive Reports

Detailed analysis for Key Biscayne, FL

Frequently Asked Questions

What does the Home Safety Score mean for Key Biscayne, FL?
Key Biscayne has an average Home Safety Score of 66/100 (Grade C) 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. 6 violations appear in EPA records for water systems mapped to these ZIP codes. Check individual ZIP code reports for component details.
How many violations are on record for water systems serving Key Biscayne?
EPA records list 6 EPA violations for Key Biscayne water systems. These water-system violations are shown for 1 mapped ZIP code.
Does Key Biscayne water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of Key Biscayne is 0.0031 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 Key Biscayne compare to Florida average?
Key Biscayne has an average Home Safety Score of 66/100, which is below the Florida state average of 80/100 for the same model series.
How many water systems serve Key Biscayne?
Our records map 1 water system to 1 ZIP code in Key Biscayne. The related population figure in our data is approximately 14,628 people; it is not a count of people served citywide.
How much does it cost to fix water issues in Key Biscayne?
Estimated remediation cost per household in Key Biscayne: $600; modeled range $400 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). Key Biscayne, FL: 6 Violations - Home Safety 66/100. https://zipcheckup.com/cities/fl/key-biscayne/
BibTeX 
@misc{zipcheckup-cities-fl-key-biscayne,
  author = {{ZipCheckup}},
  title  = {{Key Biscayne, FL: 6 Violations - Home Safety 66/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/fl/key-biscayne/}
}

Page version: October 2026.

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