B
81

US Water Score: B

Olmito, TX 78575

Cameron County · Population served: 8,952 · Data updated July 2026

Service-area evidence: EPA service-area records associate the listed system with this ZIP. Boundaries may still overlap or change.

Water Systems Serving This Area

🏔
OLMITO WSC
Surface water · Pop. 8,952
PWSID: TX0310026
🏔
VALLEY MUD 2 RANCHO VIEJO
Surface water · Pop. 3,644
PWSID: TX0310059

Contaminants Detected

ContaminantDetected LevelEPA MCLHealth GuidelineStatus
Lead
0.0
15 ppb 1 ppb Passed

PFAS / Forever Chemicals

5 detected 1 above comparison value

UCMR5 occurrence results are screening information, not a finding of regulatory compliance or noncompliance. PFAS rules and compliance dates are evolving.

CompoundLevelEPA MCLHealth GuidelineStatus
PFBA10.6 pptNo standard500 pptNo federal MCL shown
PFPeA5.3 pptNo standardNo federal MCL shown
PFHxA4.9 pptNo standard400 pptNo federal MCL shown
PFOS4.5 ppt4 ppt4 pptAbove comparison value
PFHxS3.6 ppt10 ppt10 pptBelow comparison value

Violation History (Last 5 Years)

1Total (5yr)
1Health-Based
0Major

Water Quality Summary

Understanding Your Water in Olmito

Tap water quality in Olmito, Texas (78575) 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 2 water systems providing water to approximately 8,952 people, using surface water sources. 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 1 violations, including 1 health-based violations.

Your Score 81/100 B
vs State 1 pts above Texas avg (80)
vs National 6 pts above national avg (75)

What a Grade B Means

A score of 81/100 means Olmito, 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.

Surface water: sourced from rivers, lakes, or reservoirs

Health Information

What These Contaminants Mean for You

⚠️

Lead in Your Water

Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.

Health Effects

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.

Common Sources

Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.

What You Can Do

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.

Common Questions

Frequently Asked Questions

Based on public water-system records, Olmito, 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 78575 is served by 2 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 levels in Olmito, Texas are 0.0 ppb, which is at or below the health guideline of 1 ppb. This is a positive result, though periodic testing is still recommended.

Yes — 5 PFAS compounds were detected in records associated with water serving Olmito, 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 Olmito, Texas have received 1 violation in the last 5 years, including 1 health-based violation. 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 (PFAS), residents in Olmito, 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.

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