PurityMap
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Updated 2026-09-16
County water report

Comal County Water Quality

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

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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.

LithiumSJWTX TRIPLE PEAK PLANT10 µg/L EPA health reference level (screening, not a legal limit) · US EPA28.4 µg/L
Perfluorooctanesulfonic acid (PFOS)SJWTX TRIPLE PEAK PLANT4.0 ng/L federal MCL (2024) · US EPA5.2 ng/L
Perfluorohexanesulfonic acid (PFHxS)SJWTX TRIPLE PEAK PLANT10 ng/L federal MCL (2024) · US EPA12.5 ng/L
Lead (90th percentile)SJWTX TRIPLE PEAK PLANT15 µg/L federal action level · US EPA1.4 µg/L
Perfluorobutanesulfonic acid (PFBS)SJWTX TRIPLE PEAK PLANT2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA6.4 ng/L
26 PFAS tested, none detected in this systemShow

Tested in this system: SJWTX TRIPLE PEAK PLANT

  • 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)
  • Perfluorobutanoic acid (PFBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanoic acid (PFHxA)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanoic acid (PFOA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluoropentanoic acid (PFPeA)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
1 city

Cities ranked by the records

Showing 1 of 1 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 Comal County1 of 1 city reports a regulated PFAS above the federal limit
  1. Canyon Lake5.2 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Texas
Lead

0of 1 city 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. Canyon LakeSJWTX TRIPLE PEAK PLANT · TX0460172
    32,973 served
Questions

Frequently asked

How does Comal County tap water compare across cities?

PurityMap ranks 1 city in Comal 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 Canyon Lake's main water system: SJWTX TRIPLE PEAK PLANT · PWSID TX0460172 · Purity Score 68 (Fair) · 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 Comal County cities have PFAS above the federal limit?

1 city of 1 had at least one regulated PFAS (PFOA, PFOS or PFHxS) measured above the 2024 federal limit in EPA's UCMR 5 testing, including Canyon Lake (PFOS 5.2 ng/L). PFAS were detected at any level in 1.

Is there lead in Comal County tap water?

Utilities report lead as a 90th-percentile result from home taps. 1 of 1 Comal 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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