PurityMap
Search city, ZIP, contaminant⌘KFind my water
Updated 2026-09-16
State water report

Louisiana Water Quality: 66 Cities Ranked by the Records

Water quality across 66 cities in Louisiana, drawn from EPA drinking-water records. Each city page shows the measured contaminants and a reproducible Purity Score.

Finding by finding

What Louisiana'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. 3 cities have a past health-based violation on record.

PFAS above a 2024 limit

MCL

5of 66 cities

Cities whose system reported a PFAS above its federal limit.

PFOS in Louisiana →
City rankings

Louisiana cities ranked by the records

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

  1. 1
    LafayetteLAFAYETTE UTILITIES WATER SYSTEM · LA1055017
    Report →
  2. 2
    Lafourche DistrictLAFOURCHE WATER DISTRICT 1 · LA1057001
    Report →
  3. 3
    ZacharyZACHARY WATER SYSTEM · LA1033030
    Report →
  4. 4
    Rapides Parish DistrictRAPIDES PARISH WATERWORKS DISTRICT 3 · LA1079017
    Report →
  5. 5
    St Tam Parish- Bedico -Faubourg-CoquilleST TAM PARISH- BEDICO -FAUBOURG-COQUILLE · LA1103149
    Report →
  6. 6
    GretnaGRETNA WATERWORKS · LA1051003
    Report →
  7. 7
    GonzalesCITY OF GONZALES WATER SYSTEM · LA1005030
    Report →
  8. 8
    Lpwd SouthLPWD SOUTH · LA1055156
    Report →
  9. 9
    ThibodauxTHIBODAUX WATERWORKS · LA1057003
    Report →
  10. 10
    East Feliciana RuralEAST FELICIANA RURAL WATER · LA1037004
    Report →

Showing the top 10 of 66 scored cities.

See all 66 in the table

66 cities, highest Purity Score first

  1. 1Lafayette
    LAFAYETTE UTILITIES WATER SYSTEM · PWSID LA1055017 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  2. 2Lafourche District
    LAFOURCHE WATER DISTRICT 1 · PWSID LA1057001 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFBA 6.7 ng/L detected, no federal or state limitDetected
  3. 3Zachary
    ZACHARY WATER SYSTEM · PWSID LA1033030 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  4. 4Rapides Parish District
    RAPIDES PARISH WATERWORKS DISTRICT 3 · PWSID LA1079017 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  5. 5St Tam Parish- Bedico -Faubourg-Coquille
    ST TAM PARISH- BEDICO -FAUBOURG-COQUILLE · PWSID LA1103149 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  6. 6Gretna
    GRETNA WATERWORKS · PWSID LA1051003 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    PFBA 5.1 ng/L detected, no federal or state limitDetected
  7. 7Gonzales
    CITY OF GONZALES WATER SYSTEM · PWSID LA1005030 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  8. 8Lpwd South
    LPWD SOUTH · PWSID LA1055156 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  9. 9Thibodaux
    THIBODAUX WATERWORKS · PWSID LA1057003 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  10. 10East Feliciana Rural
    EAST FELICIANA RURAL WATER · PWSID LA1037004 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  11. 11Calcasieu Parish Dist 9 Carlyss
    CALCASIEU PARISH WW DIST 9 CARLYSS · PWSID LA1019116 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
  12. 12Mandeville
    CITY OF MANDEVILLE WATER SUPPLY · PWSID LA1103023 · Purity Score 100/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
    No PFAS detectedNot detected
Showing 12 of 66.

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 Louisiana compares with other states.

By contaminant

PFAS and lead in Louisiana

Counties

Louisiana counties

26 counties with city reports
Show all 26 counties
Suppliers

Largest water systems

All water systems →
Full indexAll 66 Louisiana city reports, A–Z
Next step

State patterns can’t tell you what reaches your tap.

Find my water
Learn

Learn your supplier

Resolve your address to the one public water system that serves it.

Find my water →
Test

Test your own tap

Plumbing inside a building can add lead and change what reaches your glass.

How to test →
Solve

Treat by concern

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

Treatment options →
Questions

Louisiana water, frequently asked

FOLLOW LOUISIANA WATER RECORDS

Get Louisiana updates

We'll email you when Louisiana records change, such as new PFAS or lead results.

Double opt-in: we email a confirmation link. Unsubscribe anytime. No spam.

How does Louisiana tap water compare across cities?

PurityMap ranks 66 cities in Louisiana 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 Lafayette's main water system: LAFAYETTE UTILITIES WATER SYSTEM · PWSID LA1055017 · 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 Louisiana cities have PFAS above the federal limit?

5 cities of 66 had at least one regulated PFAS (PFOA, PFOS or PFHxS) measured above the 2024 federal limit in EPA's UCMR 5 testing, including Parks (PFOA 6.4 ng/L), Plaquemine (PFOA 6.2 ng/L), Port Sulphur District (PFOS 4.6 ng/L). PFAS were detected at any level in 18.

Is there lead in Louisiana tap water?

Utilities report lead as a 90th-percentile result from home taps. 42 of 66 Louisiana 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 Louisiana water systems had drinking-water violations?

3 cities in Louisiana 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.

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