Miami-Dade County, FL
drinking water quality
2,838,461 residents · 172 public water systems · 80 ZIP codes
EPA sampled 17 of 172 public water systems here, together serving about 3,304,911 people. The highest reading was PFOS at 50.3 ng/L at Fkaa J. Robert Dean W.t.p.. 17 of the sampled systems were above a federal limit. Last sampled 9/23/2025.
What was found
| Compound | Highest result | Federal limit | Ratio |
|---|---|---|---|
| PFOS | 50.3 ng/L | 4 ng/L | 12.6× |
| PFOA | 9.9 ng/L | 4 ng/L | 2.5× |
| PFHxS | 3.4 ng/L | 10 ng/L | 0.3× |
Also detected, with no federal limit set: PFBS (22.8 ng/L), PFBA (10.2 ng/L), PFPeA (4 ng/L), PFHxA (3.3 ng/L), PFHpA (3.3 ng/L).
Health-based violations
Separately from PFAS, EPA records 22 health-based violations across 5 of the county’s water systems since 2020, the most recent in 2025. They involved nitrate, E. coli, trihalomethanes, haloacetic acids, contaminant 2982, contaminant 2980.
What this means
PFAS are industrial chemicals that EPA describes as breaking down only very slowly in the environment. In April 2024 EPA set the first enforceable national limits: 4 ng/L for PFOA and PFOS, 10 ng/L for PFHxS, PFNA and GenX.
These figures are county-level and come from EPA’s sampling of public water systems. They describe the worst result found in the county, not what comes out of any particular tap — that depends on which system serves the address, and on the plumbing in the building. A private well is not covered by this programme at all.
Find out what is in your own tap
This is a county-level reading from federal monitoring. What comes out of your own tap depends on your system — and on your home.
Miami Water Treatment Corp. is the water treatment provider listed for Miami-Dade County.
ZIP codes in Miami-Dade County
33010 · 33012 · 33013 · 33014 · 33015 · 33016 · 33018 · 33030 · 33031 · 33032 · 33033 · 33034 · 33035 · 33039 · 33054 · 33055 · 33056 · 33101 · 33109 · 33122 · 33125 · 33126 · 33127 · 33128 · 33129 · 33130 · 33131 · 33132 · 33133 · 33134 · 33135 · 33136 · 33137 · 33138 · 33139 · 33140 · 33141 · 33142 · 33143 · 33144 · 33145 · 33146 · 33147 · 33149 · 33150 · 33154 · 33155 · 33156 · 33157 · 33158 · 33160 · 33161 · 33162 · 33165 · 33166 · 33167 · 33168 · 33169 · 33170 · 33172 · 33173 · 33174 · 33175 · 33176 · 33177 · 33178 · 33179 · 33180 · 33181 · 33182 · 33183 · 33184 · 33185 · 33186 · 33187 · 33189 · 33190 · 33193 · 33194 · 33196
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.