Water Quality in Los Fresnos, TX: 8 Violations — Grade C
Grade C · Score 69/100 · 2 water systems · Updated 2026-05-03
Los Fresnos's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
The public EPA compliance record for Los Fresnos, TX holds 8 documented water violations — sourced from the federal Safe Drinking Water Information System, which tracks every reportable event for registered public water systems in the state.
Water Quality by ZIP Code in Los Fresnos
Water quality varies across Los Fresnos's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 78566 | C | 69 | 8 | 4 | View report → |
Violation Trend
EPA violations recorded for water systems serving Los Fresnos.
Water Quality Overview
Los Fresnos, Texas receives a water quality grade of C with an overall score of 69 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 2 water systems serving Los Fresnos have accumulated 8 EPA violations, including 4 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 6,855 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Los Fresnos's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
The average 90th percentile lead level across Los Fresnos water systems is 0.0017 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
Water Systems Serving Los Fresnos
Los Fresnos is served by 2 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 6,855 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 10 enforcement actions against water systems serving Los Fresnos. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Los Fresnos
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 Los Fresnos Water Systems
The following contaminants have been detected or caused violations across Los Fresnos's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 4 | 1 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 2 | 1 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 1 | 1 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Los Fresnos:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2024 | 4 | 4 |
| 2025 | 4 | 4 |
Violation counts have remained stable over the observed period.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Los Fresnos. Recent actions:
| Date | Action Type |
|---|---|
| 2025-06-30 | State Informal Action |
| 2025-05-15 | State Informal Action |
| 2025-05-15 | State Informal Enforcement |
| 2025-04-04 | State Informal Action |
| 2025-03-28 | State Filed Judgment |
| 2025-03-11 | State Informal Action |
| 2025-03-11 | State Informal Enforcement |
| 2025-02-03 | State Informal Action |
| 2025-02-03 | State Order Extension |
| 2025-01-28 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-06-30.
Los Fresnos vs. Nearby Texas Cities
How Los Fresnos's water quality compares to similar cities in Texas:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Los Fresnos | C | 8 | 2 | 6,855 |
| Merkel | B | 4 | 3 | 6,871 |
| San Felipe | B | 0 | 1 | 6,839 |
| San Diego | B | 17 | 2 | 6,836 |
Common Questions About Los Fresnos Water
These are the most common questions residents search for about water quality in Los Fresnos, Texas:
Is Los Fresnos water hard or soft? Water hardness varies by source. Los Fresnos's 2 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Los Fresnos tap water? Los Fresnos's water receives a grade of C (69/100). There are 4 health-based violations — consider filtration.
What is the best water filter for Los Fresnos? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Los Fresnos vs. Texas Average
Understanding how Los Fresnos compares to the broader Texas 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 Los Fresnos.
ZIP Codes in Los Fresnos
Los Fresnos spans 1 ZIP code. The ZIP with the lowest water quality score is 78566. 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.