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Updated 2026-10-15
County water report

Miami-Dade County Water Quality: 6 Cities Ranked by the Records

Miami-Dade County, Florida: 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 Miami-Dade 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.

Perfluorooctanesulfonic acid (PFOS)Detected in 6 systems4.0 ng/L federal MCL (2024) · US EPAHighest33 ng/L
LithiumDetected in 1 system of 6 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest59 µg/L
  • HIALEAH, CITY OF59 µg/LSample date: 2023-07-26 to 2024-01-17
  • HOMESTEAD, CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2025-03-31 to 2025-09-23
  • MDWASA - MAIN SYSTEMNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-11-08 to 2024-05-15
  • MIAMI BEACH, CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-07-17 to 2024-02-05
  • NORTH MIAMI BEACHNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-06-24 to 2024-12-02
  • OPA LOCKA, CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-04-13 to 2023-10-25
Perfluorooctanoic acid (PFOA)Detected in 4 systems of 6 tested4.0 ng/L federal MCL (2024) · US EPAHighest14 ng/L
Perfluorohexanesulfonic acid (PFHxS)Detected in 3 systems of 6 tested10 ng/L federal MCL (2024) · US EPAHighest9.4 ng/L
Perfluorononanoic acid (PFNA)Detected in 2 systems of 6 tested10 ng/L federal MCL (2024) · US EPAHighest6.5 ng/L
  • MDWASA - MAIN SYSTEM6.5 ng/LSample date: 2023-11-08 to 2024-05-15
  • HIALEAH, CITY OF4.3 ng/LSample date: 2023-07-26 to 2024-08-20
  • HOMESTEAD, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-03-31 to 2025-09-23
  • MIAMI BEACH, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-17 to 2024-02-05
  • NORTH MIAMI BEACHNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-08-01 to 2024-12-02
  • OPA LOCKA, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-06-30 to 2023-10-25
Lead (90th percentile)Detected in 6 systems15 µg/L federal action level · US EPAHighest7 µg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 6 systems2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest9.7 ng/L
Perfluorohexanoic acid (PFHxA)Detected in 5 systems of 6 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest58 ng/L
5 more contaminants detectedShow
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)Detected in 3 systems of 6 testedNo federal or state limit; shown for transparencyHighest9.6 ng/L
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)Detected in 3 systems of 6 testedNo federal or state limit; shown for transparencyHighest190 ng/L
Perfluorobutanoic acid (PFBA)Detected in 5 systems of 6 testedNo federal or state limit; shown for transparencyHighest22 ng/L
Perfluoroheptanoic acid (PFHpA)Detected in 4 systems of 6 testedNo federal or state limit; shown for transparencyHighest20 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 5 systems of 6 testedNo federal or state limit; shown for transparencyHighest56 ng/L
18 PFAS tested, none detected in any systemShow

Tested in these 6 systems: HIALEAH, CITY OF, HOMESTEAD, CITY OF, MDWASA - MAIN SYSTEM, MIAMI BEACH, CITY OF, NORTH MIAMI BEACH, OPA LOCKA, CITY OF

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 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)
  • 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 Miami-Dade County6 of 6 city reports had a PFAS sample above a 2024 EPA limit
  1. Miami33 ng/L
  2. Hialeah27.6 ng/L
  3. Homestead26 ng/L
  4. Miami Beach24 ng/L
  5. North Miami Beach20 ng/L
  6. Opa-Locka11 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Florida
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 Florida
Who supplies the county

Largest water systems

  1. MiamiMDWASA - MAIN SYSTEM · FL4130871
    2,377,460 served
  2. HialeahHIALEAH, CITY OF · FL4130604
    238,000 served
  3. North Miami BeachNORTH MIAMI BEACH · FL4131618
    180,000 served
  4. Miami BeachMIAMI BEACH, CITY OF · FL4130901
    100,000 served
  5. HomesteadHOMESTEAD, CITY OF · FL4130645
    80,000 served
  6. Opa-LockaOPA LOCKA, CITY OF · FL4131001
    16,479 served
Questions

Frequently asked

How does Miami-Dade County tap water compare across cities?

PurityMap ranks 6 cities in Miami-Dade 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 Hialeah's main water system: HIALEAH, CITY OF · PWSID FL4130604 · Purity Score 56 (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 Miami-Dade County cities had a PFAS sample above a 2024 EPA limit?

6 of 6 Miami-Dade County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Miami (PFOS 33 ng/L), Hialeah (PFOS 27.6 ng/L), Homestead (PFOS 26 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 Miami-Dade County tap water?

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