What was found in Prescott Valley'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 | 1795 µg/L 18% of the EPA limit 10000 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 1575 µg/L 16% of the EPA limit 10000 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019 | 3/4 | SYR4 |
| Fluoride | 512 µg/L 13% of the EPA limit 4000 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019 | 3/4 | SYR4 |
| Copper | 135.5 µg/L 10% of the EPA limit 1300 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019
Highest in the city: 253.5 µg/L — MINGUS MOUNTAIN ACADEMY · 130 people · 2017 | 3/4 | SYR4 |
| TTHM | 14.4 µg/L 18% of the EPA limit 80 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019
Highest in the city: 136.05 µg/L — MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 3/4 | SYR4 |
| Barium | 79.55 µg/L 4% of the EPA limit 2000 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019 | 3/4 | SYR4 |
| Chloroform | 47.565 µg/L No EPA limit set Highest in the city: MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 1/4 | SYR4 |
| Bromodichloromethane | 1.2 µg/L No EPA limit set Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019
Highest in the city: 45.64 µg/L — MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 3.67 µg/L No EPA limit set Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019
Highest in the city: 34.215 µg/L — MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 2/4 | SYR4 |
| Lithium | 24.7 µg/L No EPA limit set Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2025 | 1/4 | UCMR-5 |
| Chromium | 14 µg/L 14% of the EPA limit 100 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019
Highest in the city: 16.22 µg/L — MINGUS WEST WATER SYSTEM · 602 people · 2013 | 2/4 | SYR4 |
| Bromoform | 5.96 µg/L No EPA limit set Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019
Highest in the city: 12.555 µg/L — MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 2/4 | SYR4 |
| Selenium | 11 µg/L 22% of the EPA limit 50 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019 | 1/4 | SYR4 |
| Arsenic | 10.9 µg/L 109% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019 | 3/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 3.32 µg/L 5.5% of the EPA limit 60 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019
Highest in the city: 8.35 µg/L — MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 3/4 | SYR4 |
| Lead | 4.67 µg/L 31% of the EPA limit 15 µg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 1.5 µg/L No EPA limit set Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019
Highest in the city: 4.265 µg/L — MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 2/4 | SYR4 |
| Dichloroacetic Acid | 2.97 µg/L No EPA limit set Highest in the city: MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.7 pCi/L 34% of the EPA limit 5 pCi/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2019 | 2/4 | SYR4 |
| Trichloroacetic Acid | 1.69 µg/L No EPA limit set Highest in the city: MINGUS MOUNTAIN ACADEMY · 130 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: TOWN OF PRESCOTT VALLEY · 57,048 people · 2023 | 4/4 | 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 Prescott Valley
| Supplier | Population served |
|---|---|
| TOWN OF PRESCOTT VALLEY | 57,048 |
| MINGUS WEST WATER SYSTEM | 602 |
| VENTURA RANCH DWID | 300 |
| MINGUS MOUNTAIN ACADEMY | 130 |
Frequently asked questions about Prescott Valley tap water
Is Prescott Valley tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Prescott Valley. 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 Prescott Valley?
4 public water suppliers report drinking-water monitoring for Prescott Valley, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Prescott Valley's water?
The contaminants EPA monitoring detected in Prescott Valley 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.