What was found in Mount Lemmon'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 |
|---|---|---|---|
| Fluoride | 880 µg/L 22% of the EPA limit 4000 µg/L Main supplier: MT LEMMON DWID · 290 people · 2016 | 1/1 | SYR4 |
| Copper | 460 µg/L 35% of the EPA limit 1300 µg/L Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Nitrate | 339 µg/L 3.4% of the EPA limit 10000 µg/L Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 315 µg/L 3.2% of the EPA limit 10000 µg/L Main supplier: MT LEMMON DWID · 290 people · 2016 | 1/1 | SYR4 |
| TTHM | 47.095 µg/L 59% of the EPA limit 80 µg/L Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 30.375 µg/L 51% of the EPA limit 60 µg/L Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Lead | 22.02 µg/L 147% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Chloroform | 18.05 µg/L No EPA limit set Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Barium | 10 µg/L 0.5% of the EPA limit 2000 µg/L Main supplier: MT LEMMON DWID · 290 people · 2016 | 1/1 | SYR4 |
| Trichloroacetic Acid | 9.415 µg/L No EPA limit set Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 8.665 µg/L No EPA limit set Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 8.6 µg/L No EPA limit set Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 5.425 µg/L No EPA limit set Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 2.2 µg/L No EPA limit set Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 1.6 pCi/L 32% of the EPA limit 5 pCi/L Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Bromoform | 0.6000 µg/L No EPA limit set Main supplier: MT LEMMON DWID · 290 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0057 mg/L 38% of the EPA limit 0.0150 mg/L Main supplier: MT LEMMON DWID · 290 people · 2025 | 1/1 | LCR |
Water suppliers serving Mount Lemmon
| Supplier | Population served |
|---|---|
| MT LEMMON DWID | 290 |
Frequently asked questions about Mount Lemmon tap water
Is Mount Lemmon tap water safe to drink?
EPA testing detected 17 contaminants in the water serving Mount Lemmon. 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 Mount Lemmon?
1 public water supplier report drinking-water monitoring for Mount Lemmon, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Mount Lemmon's water?
The contaminants EPA monitoring detected in Mount Lemmon include Fluoride, Copper, Nitrate, Nitrate-Nitrite, TTHM. 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.