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WaterSafeCheck

ZIP Code 78540 Water Quality Report

Edinburg, TX · Hidalgo County County

Safety Score
A

Water Safety Grade

Excellent — Meets all EPA standards

Health Violations

2

Total Violations

7

Lead Risk

Low

Contaminants

1

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Active Water Quality Issues Detected

EPA records show 0 unresolved violation. Contact North Alamo Water Supply Corporation for current status.

About Tap Water in ZIP Code 78540

Tap water in ZIP code 78540 (Edinburg, TX) is among the safest in the country. Served by North Alamo Water Supply Corporation, this area earned a water safety grade of A with a composite score of 88/100 — indicating full regulatory compliance and low contaminant risk across EPA monitoring periods.

Water System

North Alamo Water Supply Corporation

EPA ID: TX1080029

Water Source

Surface Water

Population Served

171,195 residents

County

Hidalgo County County, Texas

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Lead Levels in ZIP 78540

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Level: 3.0 ppb — Very Low

The 90th percentile lead level in 78540 is 3.0 ppb, well below the EPA action level of 15 ppb. While this is a reassuring result, the EPA's public health goal for lead is actually zero — no amount of lead is considered completely safe, particularly for children under 6 and pregnant women. Running your tap for 30 seconds before use and using a certified NSF/ANSI 53 filter adds an extra layer of protection.

Lead exposure risk in 78540 is rated Low. EPA models estimate a 18% probability of lead exposure risk in this ZIP code based on housing age, infrastructure age, and water system data. This rating reflects newer infrastructure, lower housing age, and/or low detected lead levels. Standard precautions — flushing taps before use, using filtered water for infants — are still recommended.

Lead Level (90th percentile)
3.00 ppb (0.003 mg/L)
Lead (Consumer Confidence Report)

From annual CCR filing

3 ppb
Lead Exposure Risk Rating
Low
Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

18%
Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.
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Violation History

Past 5 years — EPA SDWIS data

North Alamo Water Supply Corporation has recorded 2 health-based violations in the past 5 years. Multiple health violations suggest recurring compliance challenges. Residents should request a copy of the annual Consumer Confidence Report to understand what contaminants were involved and what corrective actions were taken.

Total Violations (5 yr)
7
Health-Based Violations
2
Unresolved Violations
0
Boil Water Advisories
0
Compliance Risk
High

Regulatory compliance risk is rated High. North Alamo Water Supply Corporation has a pattern of compliance issues that goes beyond isolated incidents. Residents should stay informed via their utility's Consumer Confidence Report.

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Contaminants Detected

Contaminants with health-based violations on record

EPA records identify 1 contaminant associated with health-based violations in ZIP code 78540: Haloacetic Acids (HAA5). These contaminants exceeded the Maximum Contaminant Levels (MCLs) established by the EPA under the Safe Drinking Water Act at some point in the 5-year monitoring period. The presence of these violations does not necessarily mean water is currently unsafe — water systems are often required to increase monitoring and treatment when violations occur. Review the annual Consumer Confidence Report for the most current status.

Haloacetic Acids (HAA5)

⚖ Enforcement Actions

10 enforcement actions have been issued against North Alamo Water Supply Corporation — a high number that reflects sustained compliance struggles. Enforcement actions escalate from administrative orders to financial penalties when utilities repeatedly fail to meet safe drinking water standards.
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Water Source & Environmental Factors

Surface Water

This system draws water from lakes, rivers, or reservoirs. Surface water is treated to remove sediment, microorganisms, and chemical contaminants before reaching taps.

Water Source Type
Surface Water
CCR Source Classification
Surface Water
EPA Radon Zone

Lower potential

Zone 3
Annual Flood Risk Cost

Estimated annual flood-related costs per property

$152

EPA Radon Zone 3 — lower radon potential, though the EPA still recommends testing all homes.

🛡 What Should You Do? — ZIP 78540 Recommendations

  • ✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
  • ✓ Request your annual Consumer Confidence Report from North Alamo Water Supply Corporation
  • ✓ If your home was built before 1986, consider testing your own tap for lead
  • ✓ Use a pitcher filter (NSF/ANSI 42 certified) for improved taste

Frequently Asked Questions — ZIP 78540 Water Quality

Is tap water safe to drink in ZIP code 78540?+
Yes — tap water in 78540 (Edinburg, TX) currently meets all federal EPA standards with a water safety grade of A. No health-based violations are on record in the past 5 years. You can drink your tap water with confidence, though running the tap for 30 seconds in the morning is always a good practice.
What is the lead level in 78540 tap water?+
The 90th percentile lead level in 78540 is 3.0 ppb (parts per billion). The EPA action level is 15 ppb. This is a low level, well below the EPA action level of 15 ppb.
Who provides tap water to 78540?+
Tap water in ZIP code 78540 is provided by North Alamo Water Supply Corporation (EPA ID: TX1080029). This system serves approximately 171,195 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 78540?+
ZIP code 78540 is served by surface water. Surface water systems draw from rivers, lakes, or reservoirs and must meet strict EPA treatment requirements including filtration and disinfection.
Does 78540 have any active water quality violations?+
There are 2 health-based violations in the past 5-year record, but no currently unresolved violations according to EPA data. This means past issues have been addressed.
How do I get a copy of my water quality report for 78540?+
Your water utility — North Alamo Water Supply Corporation — is required by law to send you an annual Consumer Confidence Report (CCR) by July 1 each year. You can also request it directly from the utility or find it online by searching "North Alamo Water Supply Corporation Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 78540?+
The right filter depends on what contaminants are present. For lead, look for a filter certified to NSF/ANSI Standard 53. For chlorine byproducts (like THMs), NSF/ANSI 42 filters work well. For a broad range of contaminants including PFAS, look for NSF/ANSI 58 (reverse osmosis) systems. For ZIP code 78540, with detected contaminants including Haloacetic Acids (HAA5), a multi-stage filter or reverse osmosis system is recommended.
Is 78540 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Current EPA data for 78540 shows a lead level of 3.0 ppb — below the action level, but as an extra precaution, run your tap for 30 seconds before use and consider a certified lead filter for infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 78540 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by North Alamo Water Supply Corporation. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →