Water Quality in San Mateo, FL: 5 Violations — Grade A
Grade A · Score 86/100 · 1 water system · Updated 2026-05-03
San Mateo's water meets all EPA standards with no health-based violations.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
According to EPA filings, San Mateo, FL has 5 water compliance violations on record — sourced from SDWIS, the federal database that tracks reportable events for every registered public water system in the state.
Water Quality by ZIP Code in San Mateo
Water quality varies across San Mateo's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 32187 | A | 86 | 5 | 1 | View report → |
Water Quality Overview
San Mateo, Florida receives a water quality grade of A with an overall score of 86 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving San Mateo have accumulated 5 EPA violations, including 1 health-based violation. These violations are tracked across 1 ZIP codes serving approximately 112 people.
What Grade A Means
A grade of A indicates excellent compliance with EPA drinking water standards. San Mateo's water systems have maintained strong performance in both contaminant monitoring and regulatory compliance.
Lead Levels
The average 90th percentile lead level across San Mateo water systems is 0.0004 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 49% of homes built before 1986, San Mateo 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 San Mateo
San Mateo is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 112 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
The EPA has taken 2 enforcement actions against water systems serving San Mateo. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in San Mateo
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
Contaminants Detected in San Mateo Water Systems
The following contaminants have been detected or caused violations across San Mateo's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 2 | 1 | No |
| Stage 2 DBP Rule | Treatment Technique | N/A | 2 | 1 | Yes |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 2 enforcement actions against water systems serving San Mateo. Recent actions:
| Date | Action Type |
|---|---|
| 2025-07-24 | State Order Extension |
| 2024-12-05 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-07-24.
San Mateo vs. Nearby Florida Cities
How San Mateo's water quality compares to similar cities in Florida:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| San Mateo | A | 5 | 1 | 112 |
| Gulf Hammock | B | 0 | 1 | 120 |
| Otter Creek | A | 8 | 1 | 120 |
| Durant | B | 0 | 1 | 100 |
Common Questions About San Mateo Water
These are the most common questions residents search for about water quality in San Mateo, Florida:
Is San Mateo water hard or soft? Water hardness varies by source. San Mateo's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink San Mateo tap water? San Mateo's water receives a grade of A (86/100). There are 1 health-based violations — consider filtration.
What is the best water filter for San Mateo? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
San Mateo vs. Florida Average
Understanding how San Mateo 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 San Mateo.
ZIP Codes in San Mateo
San Mateo spans 1 ZIP code. The ZIP with the lowest water quality score is 32187. 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.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade A is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.