Water Quality in Key Largo, FL: No Violations — Grade D
Grade D · Score 50/100 · 1 water system · Updated 2026-05-03
Key Largo's water has significant violations. Water testing and filtration are recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Within the water supply network of Key Largo, FL, no EPA violations appear anywhere in the federal compliance record — 1 public water system are tracked here, and not one has been cited for an MCL exceedance, a monitoring failure, or any other reportable compliance event.
Water Quality by ZIP Code in Key Largo
Water quality varies across Key Largo's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 33037 | D | 50 | 0 | 0 | View report → |
Water Quality Overview
Key Largo, Florida receives a water quality grade of D with an overall score of 50 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 1 water system serving Key Largo. This is a positive indicator, though it does not guarantee the absence of all contaminants — some substances (like PFAS) are not yet fully regulated.
What Grade D Means
A grade of D indicates significant compliance issues. Key Largo's water systems have accumulated violations that suggest ongoing water quality challenges. Residents should check their specific ZIP code report and consider water testing or filtration.
Lead Levels
Lead testing data for Key Largo is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
With 53% of homes built before 1986, Key Largo has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Water Systems Serving Key Largo
Key Largo is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 80,000 people across 1 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
How to Check Your Water in Key Largo
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Key Largo vs. Nearby Florida Cities
How Key Largo's water quality compares to similar cities in Florida:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Key Largo | D | 0 | 1 | 80,000 |
| Islamorada | D | 0 | 1 | 80,000 |
| Key Colony Beach | C | 0 | 1 | 80,000 |
| Long Key | C | 0 | 1 | 80,000 |
Common Questions About Key Largo Water
These are the most common questions residents search for about water quality in Key Largo, Florida:
Is Key Largo water hard or soft? Water hardness varies by source. Key Largo's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Key Largo tap water? Key Largo's water receives a grade of D (50/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Key Largo? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Key Largo vs. Florida Average
Understanding how Key Largo compares to the broader Florida average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Key Largo.
ZIP Codes in Key Largo
Key Largo spans 1 ZIP code. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
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
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.