US Water Score: B
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
3.72
|
15 ppb | 1 ppb | Warning |
| Copper |
1750.0
|
1300 ppb | 300 ppb |
UCMR5 occurrence results are screening information, not a finding of regulatory compliance or noncompliance. PFAS rules and compliance dates are evolving.
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFBA | 10.6 ppt | No standard | 500 ppt | No federal MCL shown |
| PFPeA | 5.3 ppt | No standard | — | No federal MCL shown |
| PFHxA | 4.9 ppt | No standard | 400 ppt | No federal MCL shown |
| PFOS | 4.5 ppt | 4 ppt | 4 ppt | Above comparison value |
| PFHxS | 3.6 ppt | 10 ppt | 10 ppt | Below comparison value |
Water Quality Summary
Tap water quality in Los Fresnos, Texas (78566) receives an overall grade of B (Good) with a score of 81 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is roughly in line with the Texas state average of 80. The area is served by 3 water systems providing water to approximately 8,952 people, using surface water sources. Testing has found elevated levels of Lead that warrant attention. Notably, 1 PFAS compound exceeds the EPA final MCL value used for comparison — a significant concern given the persistent nature of these chemicals. Over the past 5 years, water systems here have accumulated 12 violations, including 9 health-based violations.
A score of 81/100 means Los Fresnos, TX performs well in the US Water Score model, with only minor system-level concerns. Residents should still review their utility's Consumer Confidence Report for official compliance information and household-specific context.
Health Information
Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.
Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.
Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.
If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.
Copper can leach into water from copper plumbing, especially in newer homes or when water is acidic.
Short-term exposure above 1,300 ppb can cause gastrointestinal distress. Long-term exposure may cause liver or kidney damage. People with Wilson's disease are especially vulnerable.
Copper pipes, fittings, and faucets are the most common source. Corrosive (low-pH) water accelerates copper leaching.
If copper levels are elevated, flush pipes by running water for 15–30 seconds before use. Reverse osmosis and distillation systems effectively remove copper.
Common Questions
Based on public water-system records, Los Fresnos, Texas receives an internal US Water Score grade of B (Good) with a score of 81/100. This indicates relatively few system-level concerns in our model, but it is not an EPA safety rating and does not guarantee tap conditions inside individual homes.
ZIP code 78566 is served by 3 water systems using surface water sources, providing water to approximately 8,952 people. Surface water systems are more susceptible to contamination from agricultural runoff, industrial discharge, and weather events, but typically undergo more extensive treatment including filtration and disinfection.
Lead was reported at 3.72 ppb in public-system records for Los Fresnos, Texas. This is below the currently applicable EPA action level of 15 ppb, but may be above more protective health guidance; EPA's future LCRI action level is 10 ppb. Household plumbing can materially change tap-level exposure, so consider certified filtration and individual tap testing, especially where children are present.
Yes — 5 PFAS compounds were detected in records associated with water serving Los Fresnos, Texas, and 1 result exceeded the numerical EPA MCL value used for comparison. UCMR5 occurrence results alone are not a regulatory compliance determination. PFAS rules and compliance timelines are evolving; verify current information with the utility and EPA.
Water systems serving Los Fresnos, Texas have received 12 violations in the last 5 years, including 9 health-based violations. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.
Based on detected contaminants (lead, PFAS, copper), residents in Los Fresnos, Texas should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.