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Updated 2026-10-15
County water report

Galveston County Water Quality: 6 Cities Ranked by the Records

Galveston County, Texas: 6 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 Galveston 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 6 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest26.3 µg/L
Perfluorooctanesulfonic acid (PFOS)Detected in 1 system of 6 tested4.0 ng/L federal MCL (2024) · US EPAHighest4.8 ng/L
  • CITY OF LEAGUE CITY4.8 ng/LSample date: 2024-12-11 to 2026-03-17
  • CITY OF FRIENDSWOODNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-27 to 2025-03-12
  • CITY OF GALVESTONNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-09 to 2025-10-30
  • CITY OF LA MARQUENot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-27 to 2025-03-10
  • CITY OF TEXAS CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-11-12 to 2025-08-27
  • GALVESTON COUNTY WCID 1Not detected · below 4.0 ng/L lab reporting limitSample date: 2023-01-17 to 2023-10-13
Perfluorohexanesulfonic acid (PFHxS)Detected in 1 system of 6 tested10 ng/L federal MCL (2024) · US EPAHighest4.5 ng/L
  • CITY OF LEAGUE CITY4.5 ng/LSample date: 2024-12-11 to 2026-03-17
  • CITY OF FRIENDSWOODNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-27 to 2025-03-12
  • CITY OF GALVESTONNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-09 to 2025-10-30
  • CITY OF LA MARQUENot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-27 to 2025-03-10
  • CITY OF TEXAS CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-12 to 2025-08-27
  • GALVESTON COUNTY WCID 1Not detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-17 to 2023-10-13
Lead (90th percentile)Detected in 6 systems15 µg/L federal action level · US EPAHighest4.61 µg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 5 systems of 6 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest4.1 ng/L
Perfluorohexanoic acid (PFHxA)Detected in 6 systems400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest7.1 ng/L
Perfluorobutanoic acid (PFBA)Detected in 6 systemsNo federal or state limit; shown for transparencyHighest35.9 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 6 systemsNo federal or state limit; shown for transparencyHighest157 ng/L
23 PFAS tested, none detected in any systemShow

Tested in these 6 systems: CITY OF FRIENDSWOOD, CITY OF GALVESTON, CITY OF LA MARQUE, CITY OF LEAGUE CITY, CITY OF TEXAS CITY, GALVESTON COUNTY WCID 1

  • 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)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanoic acid (PFOA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
6 cities

Cities ranked by the records

Showing 6 of 6 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 Galveston County1 of 6 city reports had a PFAS sample above a 2024 EPA limit
  1. League City4.8 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Texas
Lead

0of 6 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. League CityCITY OF LEAGUE CITY · TX0840007
    149,557 served
  2. Texas CityCITY OF TEXAS CITY · TX0840008
    61,541 served
  3. GalvestonCITY OF GALVESTON · TX0840003
    52,326 served
  4. FriendswoodCITY OF FRIENDSWOOD · TX0840002
    43,190 served
  5. DickinsonGALVESTON COUNTY WCID 1 · TX0840001
    30,399 served
  6. La MarqueCITY OF LA MARQUE · TX0840006
    15,154 served
Questions

Frequently asked

How does Galveston County tap water compare across cities?

PurityMap ranks 6 cities in Galveston 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 Dickinson's main water system: GALVESTON COUNTY WCID 1 · PWSID TX0840001 · Purity Score 99 (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 Galveston County cities had a PFAS sample above a 2024 EPA limit?

1 of 6 Galveston County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including League City (PFOS 4.8 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 6.

Is there lead in Galveston County tap water?

Utilities report lead as a 90th-percentile result from home taps. 6 of 6 Galveston 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.

Have Galveston County water systems had drinking-water violations?

1 city in Galveston County has a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.

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