Is Miami tap water safe to drink?
Is Miami tap water safe to drink? Mdwasa - Main System serves about 2.38 million people from 77 active wells. PFOS reached 33 ng/L and PFOA reached 14 ng/L in EPA's 2023 to 2025 testing, above the 4 ng/L limit that takes effect in 2029.
Is Miami tap water safe to drink? PFAS results
8 samples from November 2023 to May 2024 were checked for 29 PFAS compounds. 11 were found at least once, the highest being 6:2 FTS at 190 ng/L. PFOS peaked at 33 ng/L and PFOA peaked at 14 ng/L, over the 4 ng/L limit.
| Compound | Highest | Found in |
|---|---|---|
| 6:2 FTS | 190 ng/L | 3 of 8 |
| PFHxA | 58 ng/L | 6 of 8 |
| PFPeA | 56 ng/L | 6 of 8 |
| PFOS | 33 ng/L | 6 of 8 |
| PFBA | 22 ng/L | 6 of 8 |
| PFHpA | 20 ng/L | 5 of 8 |
| PFOA | 14 ng/L | 6 of 8 |
| 8:2 FTS | 9.6 ng/L | 2 of 8 |
| PFHxS | 9.4 ng/L | 3 of 8 |
| PFNA | 6.5 ng/L | 2 of 8 |
| PFBS | 4.6 ng/L | 6 of 8 |
Where Miami's water comes from
EPA's facility list for Mdwasa - Main System shows 77 active wells in use, with 3 treatment facilities.
Violations on file for Mdwasa - Main System
EPA's file for Mdwasa - Main System has no health-based violation between January 2016 and October 2026. State inspectors made 34 recorded visits in that time, the latest a site visit in December 2025.
Lead results for Mdwasa - Main System
EPA holds 8 rounds of home tap sampling for Mdwasa - Main System, from December 2014 to December 2023. The 90th percentile ranged from 2 to 9.1 ppb, and the later rounds averaged 2.9 ppb against 4.4 ppb in the earlier ones. All 8 rounds stayed under the 15 ppb action level.
| Round ended | Lead, 90th percentile |
|---|---|
| December 2023 | 3.1 ppb |
| December 2020 | 3.5 ppb |
| December 2019 | 2.5 ppb |
| December 2018 | 2.3 ppb |
| December 2017 | 2 ppb |
| June 2016 | 9.1 ppb |
| December 2015 | 4 ppb |
| December 2014 | 2.6 ppb |
Miami water quality compared with other Florida cities
We compared the EPA file of Mdwasa - Main System with those of 6 other Florida cities. One city has more health-based violations since 2016 than Mdwasa - Main System, and none has fewer. On lead, 5 reported a lower latest result and 1 a higher one. None had more PFAS compounds detected.
Radon in Miami-Dade County
Miami-Dade County is in EPA radon Zone 2 (moderate potential). The Florida radon page lists every county.
Check your ZIP code
Records: EPA ECHO drinking water data (2026Q3), EPA UCMR 5 (August 2026), EPA radon zones. What the limits mean: drinking water guide · methodology.