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Updated 2026-10-15
County water report

Bexar County Water Quality: 7 Cities Ranked by the Records

Bexar County, Texas: 7 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 Bexar 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 systems of 7 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest32.7 µg/L
Water hardnessDetected in 1 systemAesthetic, no federal health limit · USGSHighest17.5 gpg
Total trihalomethanes (TTHM)Detected in 1 system80 ppb federal MCL · US EPAHighest33 ppb
Lead (90th percentile)Detected in 6 systems of 7 tested15 µg/L federal action level · US EPAHighest2.2 µg/L
Haloacetic acids (HAA5)Detected in 1 system60 ppb federal MCL · US EPAHighest8 ppb
Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems of 7 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest3.8 ng/L
Perfluorobutanoic acid (PFBA)Detected in 1 system of 7 testedNo federal or state limit; shown for transparencyHighest9.2 ng/L
  • SAN ANTONIO WATER SYSTEM9.2 ng/LSample date: 2023-05-08 to 2026-06-16
  • CITY OF CONVERSENot detected · below 5.0 ng/L lab reporting limitSample date: 2023-08-15 to 2024-08-22
  • CITY OF LEON VALLEYNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-02-06 to 2024-08-13
  • CITY OF LIVE OAKNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-07-10
  • CITY OF SCHERTZNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-06-20 to 2024-12-12
  • CITY OF UNIVERSAL CITYNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-11-14 to 2025-05-15
  • FAIR OAKS RANCH UTILITIESNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-03-05 to 2024-12-03
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 7 testedNo federal or state limit; shown for transparencyHighest3.2 ng/L
  • SAN ANTONIO WATER SYSTEM3.2 ng/LSample date: 2023-05-08 to 2026-06-16
  • CITY OF CONVERSENot detected · below 3.0 ng/L lab reporting limitSample date: 2023-08-15 to 2024-08-22
  • CITY OF LEON VALLEYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-06 to 2024-08-13
  • CITY OF LIVE OAKNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-07-10
  • CITY OF SCHERTZNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-20 to 2024-12-12
  • CITY OF UNIVERSAL CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-14 to 2025-05-15
  • FAIR OAKS RANCH UTILITIESNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-03-05 to 2024-12-03
26 PFAS tested, none detected in any systemShow

Tested in these 7 systems: CITY OF CONVERSE, CITY OF LEON VALLEY, CITY OF LIVE OAK, CITY OF SCHERTZ, CITY OF UNIVERSAL CITY, FAIR OAKS RANCH UTILITIES, SAN ANTONIO WATER SYSTEM

  • 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)
  • Perfluorohexanesulfonic acid (PFHxS)
  • Perfluorohexanoic acid (PFHxA)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanesulfonic acid (PFOS)
  • Perfluorooctanoic acid (PFOA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
7 cities

Cities ranked by the records

Showing 6 of 7 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 Bexar CountyPFAS detected in 2 of 7 cities; none had a sample above a 2024 EPA limit
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Texas
Lead

0of 7 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
Hard water

1city reports hardness · San Antonio, 17.5 gpg

Hard on the USGS scale. An aesthetic measure with no federal health limit.

Hard water explained
Who supplies the county

Largest water systems

  1. San AntonioSAN ANTONIO WATER SYSTEM · TX0150018
    2,643,729 served
  2. SchertzCITY OF SCHERTZ · TX0940003
    41,948 served
  3. ConverseCITY OF CONVERSE · TX0150047
    29,709 served
  4. Universal CityCITY OF UNIVERSAL CITY · TX0150009
    20,119 served
  5. Fair Oaks RanchFAIR OAKS RANCH UTILITIES · TX0150216
    9,768 served
  6. Live OakCITY OF LIVE OAK · TX0150068
    8,724 served
  7. Leon ValleyCITY OF LEON VALLEY · TX0150178
    6,870 served
Questions

Frequently asked

How does Bexar County tap water compare across cities?

PurityMap ranks 7 cities in Bexar 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 Schertz's main water system: CITY OF SCHERTZ · PWSID TX0940003 · 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 Bexar County cities had a PFAS sample above a 2024 EPA limit?

None of the 7 Bexar County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 2.

Is there lead in Bexar County tap water?

Utilities report lead as a 90th-percentile result from home taps. 6 of 7 Bexar 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.

Does Bexar County have hard water?

Hardness is published in utility water-quality reports for 1 Bexar County city on record; the hardest is San Antonio at 17.5 grains per gallon. Hardness affects scale and appliances; it is not a health finding.

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