What was found in Superior'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 | 1500 µg/L 15% of the EPA limit 10000 µg/L Main supplier: ARIZONA WATER CO - SUPERIOR · 4,393 people · 2019
Highest in the city: 5588.499999999999 µg/L — QUEEN VALLEY DWID · 1,200 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 4455 µg/L 45% of the EPA limit 10000 µg/L Highest in the city: QUEEN VALLEY DWID · 1,200 people · 2018 | 1/3 | SYR4 |
| Fluoride | 397 µg/L 9.9% of the EPA limit 4000 µg/L Highest in the city: QUEEN VALLEY DWID · 1,200 people · 2018 | 1/3 | SYR4 |
| Copper | 152.99999999999997 µg/L 12% of the EPA limit 1300 µg/L Main supplier: ARIZONA WATER CO - SUPERIOR · 4,393 people · 2019
Highest in the city: 254.99999999999994 µg/L — QUEEN VALLEY DWID · 1,200 people · 2018 | 3/3 | SYR4 |
| TTHM | 61.13999999999999 µg/L 76% of the EPA limit 80 µg/L Main supplier: ARIZONA WATER CO - SUPERIOR · 4,393 people · 2019 | 3/3 | SYR4 |
| Barium | 32.25 µg/L 1.6% of the EPA limit 2000 µg/L Highest in the city: QUEEN VALLEY DWID · 1,200 people · 2018 | 1/3 | SYR4 |
| Lithium | 32 µg/L No EPA limit set Main supplier: ARIZONA WATER CO - SUPERIOR · 4,393 people · 2024 | 1/3 | UCMR-5 |
| Chromium | 12.445 µg/L 12% of the EPA limit 100 µg/L Highest in the city: QUEEN VALLEY DWID · 1,200 people · 2018 | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11 µg/L 18% of the EPA limit 60 µg/L Main supplier: ARIZONA WATER CO - SUPERIOR · 4,393 people · 2019 | 3/3 | SYR4 |
| Lead | 10.159999999999997 µg/L 68% of the EPA limit 15 µg/L Main supplier: ARIZONA WATER CO - SUPERIOR · 4,393 people · 2019 | 3/3 | SYR4 |
| Arsenic | 8.4 µg/L 84% of the EPA limit 10 µg/L Main supplier: ARIZONA WATER CO - SUPERIOR · 4,393 people · 2019 | 2/3 | SYR4 |
| Bromoform | 4 µg/L No EPA limit set Highest in the city: QUEEN VALLEY DWID · 1,200 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 1.5 µg/L No EPA limit set Highest in the city: QUEEN VALLEY DWID · 1,200 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.7000 pCi/L 14% of the EPA limit 5 pCi/L Highest in the city: QUEEN VALLEY DWID · 1,200 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: ARIZONA WATER CO - SUPERIOR · 4,393 people · 2025
Highest in the city: 0.0033 mg/L — THE OAKS MOBILE HOME PARK · 180 people · 2023 | 3/3 | LCR |
Water suppliers serving Superior
| Supplier | Population served |
|---|---|
| ARIZONA WATER CO - SUPERIOR | 4,393 |
| QUEEN VALLEY DWID | 1,200 |
| THE OAKS MOBILE HOME PARK | 180 |
Frequently asked questions about Superior tap water
Is Superior tap water safe to drink?
EPA testing detected 15 contaminants in the water serving Superior. 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 Superior?
3 public water suppliers report drinking-water monitoring for Superior, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Superior's water?
The contaminants EPA monitoring detected in Superior include Nitrate, Nitrate-Nitrite, Fluoride, Copper, 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.