Hidalgo County, Texas
34 ZIP codes · Avg score 78/100 · Grade B · Updated 2026-06-03
Although county size varies, Hidalgo County's 34 ZIP codes share reliably safe tap water records and above-average compliance scores.
How Hidalgo County Compares
How Hidalgo County Compares
Hidalgo County scores 4 points below the Texas state average (82/100) and 10 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Hidalgo County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.4 (asthma 8.8%, diabetes 17.6%)
Estimated additional annual cost per homeowner: $3,466, driven primarily by flood
Infrastructure: 0.26% avg pipe failure probability
32.2% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Hidalgo County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 48 violations. Past 5 years: 127 total (127 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $3,466
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
296,787 housing units in Hidalgo County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Hidalgo County
Remediation costs are relatively manageable for most homeowners in Hidalgo County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Hidalgo County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Hidalgo County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | NORTH ALAMO WSC | 171,195 | 104 |
| 2 | City of Weslaco | 40,033 | 77 |
| 3 | Military Hwy Water Supply Corporation Progreso | 12,198 | 72 |
| 4 | City of Mercedes | 16,258 | 61 |
| 5 | Llano Grande Lake Park East | 1,300 | 61 |
25 total water systems serve Hidalgo County.
All ZIP Codes in Hidalgo County
34 ZIP codes tracked in Hidalgo County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 78502 | Mcallen | 95 | A | 0 | — |
| 2 | 78505 | Mcallen | 90 | A | 0 | — |
| 3 | 78543 | Elsa | 89 | A | 2 | $86K |
| 4 | 78540 | Edinburg | 88 | A | 7 (2 health) | — |
| 5 | 78557 | Hidalgo | 86 | A | 9 (1 health) | $156K |
| 6 | 78503 | Mcallen | 85 | A | 0 | $130K |
| 7 | 78504 | Mcallen | 85 | A | 0 | $204K |
| 8 | 78589 | San Juan | 85 | A | 0 | $112K |
| 9 | 78516 | Alamo | 83 | B | 4 | $103K |
| 10 | 78537 | Donna | 83 | B | 1 | $75K |
| 11 | 78541 | Edinburg | 83 | B | 7 (2 health) | $143K |
| 12 | 78542 | Edinburg | 83 | B | 7 (2 health) | $124K |
| 13 | 78579 | Progreso | 82 | B | 6 (5 health) | — |
| 14 | 78573 | Mission | 81 | B | 2 (1 health) | $155K |
| 15 | 78574 | Mission | 81 | B | 2 (1 health) | $119K |
| 16 | 78501 | Mcallen | 80 | B | 0 | $149K |
| 17 | 78562 | La Villa | 80 | B | 2 | $118K |
| 18 | 78577 | Pharr | 80 | B | 0 | $112K |
| 19 | 78539 | Edinburg | 78 | B | 7 (2 health) | $198K |
| 20 | 78538 | Edcouch | 77 | B | 0 | $87K |
| 21 | 78572 | Mission | 76 | B | 2 (1 health) | $122K |
| 22 | 78596 | Weslaco | 76 | B | 6 (1 health) | $93K |
| 23 | 78599 | Weslaco | 76 | B | 6 (1 health) | $113K |
| 24 | 78549 | Hargill | 73 | B | 0 | $63K |
| 25 | 78560 | La Joya | 73 | B | 45 (8 health) | $114K |
| 26 | 78563 | Linn | 73 | B | 0 | — |
| 27 | 78565 | Los Ebanos | 73 | B | 0 | — |
| 28 | 78588 | San Isidro | 73 | B | 0 | — |
| 29 | 78536 | Delmita | 66 | C | 0 | $87K |
| 30 | 78591 | Santa Elena | 66 | C | 0 | — |
| 31 | 78558 | La Blanca | 65 | C | 0 | $55K |
| 32 | 78576 | Penitas | 65 | C | 0 | $117K |
| 33 | 78595 | Sullivan City | 65 | C | 0 | $86K |
| 34 | 78570 | Mercedes | 60 | C | 55 (5 health) | $83K |
Recommended Buyer Guides for Hidalgo County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Hidalgo County, Texas
Overview
Hidalgo County in Texas covers 34 ZIP codes with an average Home Safety Score of B (78/100).
17 of 34 ZIP codes have recorded EPA violations. 32 health-based violations have been documented.
← Back to Texas water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.