What was found in Miami's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2700 µg/L 27% of the EPA limit 10000 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 2697 µg/L 27% of the EPA limit 10000 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Fluoride | 740 µg/L 19% of the EPA limit 4000 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Copper | 221.5 µg/L 17% of the EPA limit 1300 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Lithium | 200 µg/L No EPA limit set Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2025 | 1/1 | UCMR-5 |
| Barium | 51.4 µg/L 2.6% of the EPA limit 2000 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Lead | 30.22 µg/L 201% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Chromium | 9.74 µg/L 9.7% of the EPA limit 100 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Arsenic | 9.53 µg/L 95% of the EPA limit 10 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| TTHM | 9.38 µg/L 12% of the EPA limit 80 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Xylenes, Total | 7.25 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Selenium | 4.8 µg/L 9.6% of the EPA limit 50 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 2.905 µg/L 4.8% of the EPA limit 60 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Toluene | 2.26 µg/L 0.2% of the EPA limit 1000 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Ethylbenzene | 1.19 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 0.7000 pCi/L 14% of the EPA limit 5 pCi/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2019 | 1/1 | SYR4 |
| PFBS | 0.0370 µg/L No EPA limit set Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2025 | 1/1 | UCMR-5 |
| Pfhxa | 0.0160 µg/L No EPA limit set Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2025 | 1/1 | UCMR-5 |
| Pfba | 0.0120 µg/L No EPA limit set Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2025 | 1/1 | UCMR-5 |
| PFHXS | 0.0120 µg/L No EPA limit set Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0069 µg/L No EPA limit set Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2025 | 1/1 | UCMR-5 |
| Pfpes | 0.0045 µg/L No EPA limit set Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: ARIZONA WATER CO - MIAMI CLAYPOOL · 8,656 people · 2025 | 1/1 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Miami
| Supplier | Population served |
|---|---|
| ARIZONA WATER CO - MIAMI CLAYPOOL | 8,656 |
Frequently asked questions about Miami tap water
Is Miami tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Miami. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Miami?
1 public water supplier report drinking-water monitoring for Miami, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Miami's water?
The contaminants EPA monitoring detected in Miami include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Lithium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.