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Updated 2026-10-15
County water report

Hidalgo County Water Quality: 11 Cities Ranked by the Records

Hidalgo County, Texas: 11 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Hidalgo County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 11 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest92.9 µg/L
Perfluorooctanesulfonic acid (PFOS)Detected in 4 systems of 11 tested4.0 ng/L federal MCL (2024) · US EPAHighest7.4 ng/L
  • CITY OF DONNA7.4 ng/LSample date: 2023-09-19 to 2024-09-17
  • CITY OF WESLACO5.9 ng/LSample date: 2025-02-19 to 2025-09-02
  • CITY OF EDINBURG4.5 ng/LSample date: 2023-04-03 to 2024-03-13
  • CITY OF SAN JUAN4.5 ng/LSample date: 2024-11-12 to 2025-08-27
  • CITY OF ALAMONot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-21 to 2025-08-20
  • CITY OF HIDALGO WATER SYSTEMNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-08-27 to 2025-02-18
  • CITY OF MERCEDESNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-01-25 to 2024-03-12
  • CITY OF MISSIONNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-15 to 2024-08-06
  • CITY OF PHARRNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-12-04
  • MCALLEN PUBLIC UTILITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-06-06 to 2024-03-27
  • MILITARY HWY WSC PROGRESONot detected · below 4.0 ng/L lab reporting limitSample date: 2024-11-19 to 2025-05-01
Perfluorohexanesulfonic acid (PFHxS)Detected in 3 systems of 11 tested10 ng/L federal MCL (2024) · US EPAHighest5.8 ng/L
  • CITY OF WESLACO5.8 ng/LSample date: 2025-02-19 to 2025-09-02
  • CITY OF DONNA4.5 ng/LSample date: 2023-09-19 to 2024-09-17
  • CITY OF SAN JUAN3.9 ng/LSample date: 2024-11-12 to 2025-08-27
  • CITY OF ALAMONot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-21 to 2025-08-20
  • CITY OF EDINBURGNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-03 to 2024-03-13
  • CITY OF HIDALGO WATER SYSTEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-27 to 2025-02-18
  • CITY OF MERCEDESNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2024-03-12
  • CITY OF MISSIONNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-15 to 2024-08-06
  • CITY OF PHARRNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-12-04
  • MCALLEN PUBLIC UTILITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-06 to 2024-03-27
  • MILITARY HWY WSC PROGRESONot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-19 to 2025-05-01
Lead (90th percentile)Detected in 8 systems of 11 tested15 µg/L federal action level · US EPAHighest3.74 µg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems of 11 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest3.6 ng/L
  • CITY OF DONNA3.6 ng/LSample date: 2023-09-19 to 2024-09-17
  • CITY OF EDINBURG3.4 ng/LSample date: 2023-04-03 to 2024-03-13
  • CITY OF ALAMONot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-21 to 2025-08-20
  • CITY OF HIDALGO WATER SYSTEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-27 to 2025-02-18
  • CITY OF MERCEDESNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2024-03-12
  • CITY OF MISSIONNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-15 to 2024-08-06
  • CITY OF PHARRNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-12-04
  • CITY OF SAN JUANNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-12 to 2025-08-27
  • CITY OF WESLACONot detected · below 3.0 ng/L lab reporting limitSample date: 2025-02-19 to 2025-09-02
  • MCALLEN PUBLIC UTILITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-06 to 2024-03-27
  • MILITARY HWY WSC PROGRESONot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-19 to 2025-05-01
Perfluorohexanoic acid (PFHxA)Detected in 5 systems of 11 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest9 ng/L
Perfluorobutanoic acid (PFBA)Detected in 8 systems of 11 testedNo federal or state limit; shown for transparencyHighest27.2 ng/L
Perfluoroheptanoic acid (PFHpA)Detected in 2 systems of 11 testedNo federal or state limit; shown for transparencyHighest3.6 ng/L
  • CITY OF WESLACO3.6 ng/LSample date: 2025-02-19 to 2025-09-02
  • CITY OF SAN JUAN3.5 ng/LSample date: 2024-11-12 to 2025-08-27
  • CITY OF ALAMONot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-21 to 2025-08-20
  • CITY OF DONNANot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-19 to 2024-09-17
  • CITY OF EDINBURGNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-03 to 2024-03-13
  • CITY OF HIDALGO WATER SYSTEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-27 to 2025-02-18
  • CITY OF MERCEDESNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2024-03-12
  • CITY OF MISSIONNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-15 to 2024-08-06
  • CITY OF PHARRNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-12-04
  • MCALLEN PUBLIC UTILITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-06 to 2024-03-27
  • MILITARY HWY WSC PROGRESONot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-19 to 2025-05-01
1 more contaminant detectedShow
Perfluoropentanoic acid (PFPeA)Detected in 4 systems of 11 testedNo federal or state limit; shown for transparencyHighest9.2 ng/L
  • CITY OF SAN JUAN9.2 ng/LSample date: 2024-11-12 to 2025-08-27
  • CITY OF WESLACO8.4 ng/LSample date: 2025-02-19 to 2025-09-02
  • CITY OF DONNA4.5 ng/LSample date: 2023-09-19 to 2024-09-17
  • CITY OF ALAMO3.5 ng/LSample date: 2024-05-21 to 2025-08-20
  • CITY OF EDINBURGNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-03 to 2024-03-13
  • CITY OF HIDALGO WATER SYSTEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-27 to 2025-02-18
  • CITY OF MERCEDESNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-25 to 2024-03-12
  • CITY OF MISSIONNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-15 to 2024-08-06
  • CITY OF PHARRNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-12-04
  • MCALLEN PUBLIC UTILITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-06 to 2024-03-27
  • MILITARY HWY WSC PROGRESONot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-19 to 2025-05-01
22 PFAS tested, none detected in any systemShow

Tested in these 11 systems: CITY OF ALAMO, CITY OF DONNA, CITY OF EDINBURG, CITY OF HIDALGO WATER SYSTEM, CITY OF MERCEDES, CITY OF MISSION, CITY OF PHARR, CITY OF SAN JUAN, CITY OF WESLACO, MCALLEN PUBLIC UTILITY, MILITARY HWY WSC PROGRESO

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanoic acid (PFOA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
11 cities

Cities ranked by the records

Showing 6 of 11 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Hidalgo County4 of 11 city reports had a PFAS sample above a 2024 EPA limit
  1. Donna7.4 ng/L
  2. Weslaco5.9 ng/L
  3. Edinburg4.5 ng/L
  4. San Juan4.5 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Texas
Lead

0of 11 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Texas
Who supplies the county

Largest water systems

  1. McAllenMCALLEN PUBLIC UTILITY · TX1080006
    145,050 served
  2. EdinburgCITY OF EDINBURG · TX1080004
    85,224 served
  3. PharrCITY OF PHARR · TX1080009
    79,715 served
  4. MissionCITY OF MISSION · TX1080008
    77,058 served
  5. WeslacoCITY OF WESLACO · TX1080011
    40,033 served
  6. San JuanCITY OF SAN JUAN · TX1080010
    30,000 served
  7. AlamoCITY OF ALAMO · TX1080001
    21,065 served
  8. DonnaCITY OF DONNA · TX1080002
    18,720 served
  9. MercedesCITY OF MERCEDES · TX1080007
    16,258 served
  10. HidalgoCITY OF HIDALGO WATER SYSTEM · TX1080021
    14,800 served
Questions

Frequently asked

How does Hidalgo County tap water compare across cities?

PurityMap ranks 11 cities in Hidalgo County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Progreso's main water system: MILITARY HWY WSC PROGRESO · PWSID TX1080234 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Hidalgo County cities had a PFAS sample above a 2024 EPA limit?

4 of 11 Hidalgo County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Donna (PFOS 7.4 ng/L), Weslaco (PFOS 5.9 ng/L), San Juan (PFOS 4.5 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 9.

Is there lead in Hidalgo County tap water?

Utilities report lead as a 90th-percentile result from home taps. 8 of 11 Hidalgo County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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