Tap Water Quality Report
Tap water quality in Miami, Florida
Tap water in Miami, Florida receives a grade of F (46/100) from TapWaterSafety.org. It's served by MDWASA - MAIN SYSTEM. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Miami's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Miami.
PFAS contamination
Severe concernPerfluorononanoic acid (PFNA), Perfluorooctane sulfonate (PFOS) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 1.77 ppt, 1771x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 37.6 ppb, 627x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 29.0 ppb, 290x above the EWG health guideline of 0.1 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.5 ppb.
EPA compliance record
Official U.S. EPA records for MDWASA - MAIN SYSTEM (system ID FL4130871) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Stage 2 Disinfectants and Disinfection Byproducts Rule | Missed testing or reporting | 10/01/2023 | Open |
| Revised Total Coliform Rule | Missed testing | 10/01/2023 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for Miami
Filters matched to the specific contaminants in Miami's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in Miami's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) PFAS |
4.64 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | EPA violation |
| Perfluorooctane sulfonate (PFOS) PFAS |
12.0 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Perfluorohexane sulfonate (PFHXS) PFAS |
1.77 ppt | 0.001 | 10.0 | — | — | — | — | 1771× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
37.6 ppb | 0.06 | — | — | — | — | — | 627× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
29.0 ppb | 0.1 | 60.0 | 60 | — | — | — | 290× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
32.0 ppb | 0.15 | 80.0 | 100 | — | — | — | 214× over |
| Perfluorononanoic acid (PFNA) PFAS |
0.929 ppt | 0.006 | 10.0 | — | — | — | — | 155× over |
| Bromodichloromethane Disinfection byproduct |
8.59 ppb | 0.06 | — | — | — | — | — | 143× over |
| Dibromoacetic acid Disinfection byproduct |
3.85 ppb | 0.03 | — | — | — | — | — | 128× over |
| Arsenic Heavy metal |
0.5 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 125× over |
| Dichloroacetic acid Disinfection byproduct |
18.0 ppb | 0.2 | — | — | — | — | — | 90× over |
| Trichloroacetic acid Disinfection byproduct |
5.34 ppb | 0.1 | — | — | — | — | — | 53× over |
| Chloroform Disinfection byproduct |
18.3 ppb | 0.4 | — | — | — | — | — | 46× over |
| Dibromochloromethane Disinfection byproduct |
4.62 ppb | 0.1 | — | — | — | — | — | 46× over |
| 6:2 Fluorotelomer Sulfonic Acid (6:2 FTSA) Other |
28.3 ppt | 1.0 | — | — | — | — | — | 28× over |
| Chromium (hexavalent) Heavy metal |
0.0857 ppb | 0.02 | — | — | — | — | — | 4.3× over |
| Radium, combined (-226 and -228) Radiological |
0.12 pCi/L | 0.05 | 5.0 | — | — | — | — | 2.4× over |
| Uranium Radiological |
0.54 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 1.3× over |
| 8:2 Fluorotelomer Sulfonic Acid (8:2 FTSA) Other |
1.17 ppt | 1.0 | — | — | — | — | — | 1.2× over |
| Bromoform Disinfection byproduct |
0.554 ppb | 0.5 | — | — | — | — | — | 1.1× over |
| Chlorate Disinfection byproduct |
154.2 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Nitrate Inorganic |
0.0808 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0433 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Molybdenum Other |
2.47 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.937 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
1.59 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
10.1 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Barium Heavy metal |
10.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
13.7 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
12.2 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.333 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.274 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.09 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
8.97 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
4.43 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
2.91 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.322 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.152 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.167 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.654 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Nitrite Inorganic |
0.0457 ppm | — | 1.0 | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from MDWASA - MAIN SYSTEM.
General Contact
Treatment Plant
ZIP codes served
Miami's public water systems serve the following ZIP codes: