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Updated 2026-09-16
State water report

Texas Water Quality: 364 Cities Ranked by the Records

Water quality across 364 cities in Texas, drawn from EPA drinking-water records. Each city page shows the measured contaminants and a reproducible Purity Score.

Finding by finding

What Texas's records show

Counts of cities whose serving system reported each result. There is no statewide score: PurityMap does not average local records into a statewide safety verdict. 23 cities have a past health-based violation on record.

PFAS above a 2024 limit

MCL

67of 364 cities

Cities whose system reported a PFAS above its federal limit.

PFOS in Texas →

Nitrate above the MCL

MCL

0of 364 cities

Cities whose system reported nitrate above 10 mg/L.

About nitrate →

Hard or very hard

No federal limit

6of 364 cities

Above 120 mg/L as CaCO₃ (7 gpg) on the USGS scale, of 7 cities with a hardness value.

About hard water →
City rankings

Texas cities ranked by the records

Highest first. A summary of each serving system’s record, not a safety verdict.

  1. 1
    LewisvilleCITY OF LEWISVILLE · TX0610004
    Report →
  2. 2
    CarrolltonCITY OF CARROLLTON · TX0570034
    Report →
  3. 3
    ConroeCITY OF CONROE · TX1700001
    Report →
  4. 4
    AllenCITY OF ALLEN · TX0430025
    Report →
  5. 5
    HarlingenHARLINGEN WATER WORKS SYSTEM · TX0310002
    Report →
  6. 6
    LongviewCITY OF LONGVIEW · TX0920004
    Report →
  7. 7
    MissionCITY OF MISSION · TX1080008
    Report →
  8. 8
    VictoriaCITY OF VICTORIA · TX2350002
    Report →
  9. 9
    Lower Valley DistrictLOWER VALLEY WATER DISTRICT · TX0710154
    Report →
  10. 10
    DeSotoCITY OF DESOTO · TX0570006
    Report →

Showing the top 10 of 364 scored cities.

See all 364 in the table

364 cities, highest Purity Score first

  1. 1Lewisville
    CITY OF LEWISVILLE · PWSID TX0610004 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFAS detected, none above a limitDetected
  2. 2Carrollton
    CITY OF CARROLLTON · PWSID TX0570034 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFAS detected, none above a limitDetected
  3. 3Conroe
    CITY OF CONROE · PWSID TX1700001 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  4. 4Allen
    CITY OF ALLEN · PWSID TX0430025 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFAS detected, none above a limitDetected
  5. 5Harlingen
    HARLINGEN WATER WORKS SYSTEM · PWSID TX0310002 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFAS detected, none above a limitDetected
  6. 6Longview
    CITY OF LONGVIEW · PWSID TX0920004 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  7. 7Mission
    CITY OF MISSION · PWSID TX1080008 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFBA 7.3 ng/L detected, no federal or state limitDetected
  8. 8Victoria
    CITY OF VICTORIA · PWSID TX2350002 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFPeA 3 ng/L detected, no federal or state limitDetected
  9. 9Lower Valley District
    LOWER VALLEY WATER DISTRICT · PWSID TX0710154 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFAS detected, none above a limitDetected
  10. 10DeSoto
    CITY OF DESOTO · PWSID TX0570006 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFAS detected, none above a limitDetected
  11. 11Eagle Pass
    CITY OF EAGLE PASS · PWSID TX1620001 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  12. 12Cedar Hill
    CITY OF CEDAR HILL · PWSID TX0570036 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFAS detected, none above a limitDetected
Showing 12 of 364.

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no state 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. See how Texas compares with other states.

By contaminant

PFAS, lead and hard water in Texas

Counties

Texas counties

100 counties with city reports
Show all 100 counties
Suppliers

Largest water systems

All water systems →
Full indexAll 364 Texas city reports, A–Z
Next step

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Treat by concern

Only after a city report names a finding, match a treatment certified for it.

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Questions

Texas water, frequently asked

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How does Texas tap water compare across cities?

PurityMap ranks 364 cities in Texas 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 Lewisville's main water system: CITY OF LEWISVILLE · PWSID TX0610004 · 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 Texas cities have PFAS above the federal limit?

67 cities of 364 had at least one regulated PFAS (PFOA, PFOS or PFHxS) measured above the 2024 federal limit in EPA's UCMR 5 testing, including Grand Prairie (PFOS 82 ng/L), Abilene (PFOS 30 ng/L), Boerne (PFOS 26.3 ng/L). PFAS were detected at any level in 270.

Is there lead in Texas tap water?

Utilities report lead as a 90th-percentile result from home taps. 236 of 364 Texas 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 Texas water systems had drinking-water violations?

23 cities in Texas have 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.

Does Texas have hard water?

Hardness is published in utility water-quality reports for 7 Texas cities on record; the hardest is San Antonio at 17.5 grains per gallon. Hardness affects scale and appliances; it is not a health finding.

Limits, sources and corrections

A statewide page cannot tell you what reaches a specific address. Water quality varies by supplier, sampling period and household plumbing; open a city report for the evidence behind a local result.

Sources: EPA UCMR 5 (PFAS, 2024), SDWIS Lead and Copper Rule 90th-percentile results and health-based violations, and utility Consumer Confidence Reports where on file. Every city report links its dated source records.

Updated 2026-09-16. How PurityMap analyzes water data · Report an error