What was found in Prescott'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-Nitrite | 1694 µg/L 17% of the EPA limit 10000 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2018
Highest in the city: 9371 µg/L — BRADSHAW WATER COMPANY INC · 510 people · 2019 | 12/17 | SYR4 |
| Nitrate | 1700 µg/L 17% of the EPA limit 10000 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 7845 µg/L — BRADSHAW WATER COMPANY INC · 510 people · 2019 | 14/17 | SYR4 |
| Copper | 78.345 µg/L 6% of the EPA limit 1300 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 2084 µg/L — JACKSON ACRES DWID · 30 people · 2019 | 17/17 | SYR4 |
| Fluoride | 1052.15 µg/L 26% of the EPA limit 4000 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2018
Highest in the city: 2000 µg/L — GRANITE DELLS WATER COMPANY · 50 people · 2017 | 13/17 | SYR4 |
| Barium | 36.1 µg/L 1.8% of the EPA limit 2000 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2018
Highest in the city: 120 µg/L — BEVERLY GARDENS TRAILER PARK · 120 people · 2014 | 13/17 | SYR4 |
| Nitrite | 110 µg/L 11% of the EPA limit 1000 µg/L Highest in the city: AMERICAN RANCH DWID · 140 people · 2017 | 1/17 | SYR4 |
| Lead | 18.654 µg/L 124% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 54 µg/L — GRANITE OAKS WATER USERS ASSOCIATION · 1,200 people · 2018 | 14/17 | SYR4 |
| TTHM | 11.875 µg/L 15% of the EPA limit 80 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 51.865 µg/L — INSCRIPTION CANYON WATER COMPANY · 507 people · 2019 | 16/17 | SYR4 |
| Combined Uranium | 16.58 µg/L 55% of the EPA limit 30 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 38.73 µg/L — LAKESIDE WATER COMPANY · 55 people · 2017 | 4/17 | SYR4 |
| Lithium | 18.9 µg/L No EPA limit set Main supplier: PRESCOTT CITY OF · 42,217 people · 2023
Highest in the city: 36 µg/L — PONDEROSA PARK DWID · 602 people · 2025 | 2/17 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 1.944 µg/L 3.2% of the EPA limit 60 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 19.9825 µg/L — INSCRIPTION CANYON WATER COMPANY · 507 people · 2019 | 14/17 | SYR4 |
| Dibromochloromethane | 18.3 µg/L No EPA limit set Highest in the city: PONDEROSA PARK DWID · 602 people · 2019 | 8/17 | SYR4 |
| Chromium | 11.317 µg/L 11% of the EPA limit 100 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2018 | 6/17 | SYR4 |
| Bromodichloromethane | 10.9 µg/L No EPA limit set Highest in the city: PONDEROSA PARK DWID · 602 people · 2019 | 6/17 | SYR4 |
| Arsenic | 9.75 µg/L 98% of the EPA limit 10 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019 | 12/17 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.5 pCi/L 23% of the EPA limit 15 pCi/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 9.6 pCi/L — PONDEROSA PARK DWID · 602 people · 2019 | 4/17 | SYR4 |
| Bromoform | 7.4 µg/L No EPA limit set Highest in the city: PONDEROSA PARK DWID · 602 people · 2019 | 10/17 | SYR4 |
| Dibromoacetic Acid | 5.7 µg/L No EPA limit set Highest in the city: PONDEROSA PARK DWID · 602 people · 2019 | 5/17 | SYR4 |
| Combined Radium (-226 And -228) | 1.2 pCi/L 24% of the EPA limit 5 pCi/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 5.26 pCi/L — PONDEROSA PARK DWID · 602 people · 2019 | 6/17 | SYR4 |
| Selenium | 4.88 µg/L 9.8% of the EPA limit 50 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2018 | 1/17 | SYR4 |
| Chloroform | 4.1 µg/L No EPA limit set Highest in the city: PONDEROSA PARK DWID · 602 people · 2019 | 2/17 | SYR4 |
| Trichloroethylene | 3.455 µg/L 69% of the EPA limit 5 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019 | 1/17 | SYR4 |
| Beryllium, Total | 2.595 µg/L 65% of the EPA limit 4 µg/L Highest in the city: GRANITE DELLS WATER COMPANY · 50 people · 2017 | 1/17 | SYR4 |
| Antimony, Total | 2.54 µg/L 42% of the EPA limit 6 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2018 | 1/17 | SYR4 |
| Dichloroacetic Acid | 2 µg/L No EPA limit set Highest in the city: PONDEROSA PARK DWID · 602 people · 2019 | 1/17 | SYR4 |
| Thallium, Total | 1.643 µg/L 82% of the EPA limit 2 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2018 | 1/17 | SYR4 |
| Trichloroacetic Acid | 1.5 µg/L No EPA limit set Highest in the city: PONDEROSA PARK DWID · 602 people · 2019 | 1/17 | SYR4 |
| Dichloromethane | 1.3 µg/L 26% of the EPA limit 5 µg/L Highest in the city: BRADSHAW WATER COMPANY INC · 510 people · 2019 | 1/17 | SYR4 |
| Tetrachloroethylene | 0.9110 µg/L 18% of the EPA limit 5 µg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2019
Highest in the city: 0.9600 µg/L — PINEHURST WATER COMPANY · 54 people · 2019 | 2/17 | SYR4 |
| PFBS | 0.0075 µg/L No EPA limit set Main supplier: PRESCOTT CITY OF · 42,217 people · 2023
Highest in the city: 0.0240 µg/L — PONDEROSA PARK DWID · 602 people · 2025 | 2/17 | UCMR-5 |
| Pfpea | 0.0149 µg/L No EPA limit set Main supplier: PRESCOTT CITY OF · 42,217 people · 2023 | 2/17 | UCMR-5 |
| Pfhxa | 0.0126 µg/L No EPA limit set Main supplier: PRESCOTT CITY OF · 42,217 people · 2023 | 2/17 | UCMR-5 |
| PFOA | 0.0114 µg/L No EPA limit set Main supplier: PRESCOTT CITY OF · 42,217 people · 2023 | 2/17 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: PRESCOTT CITY OF · 42,217 people · 2025
Highest in the city: 0.0110 mg/L — PINEHURST WATER COMPANY · 54 people · 2025 | 17/17 | LCR |
| PFOS | 0.0087 µg/L No EPA limit set Main supplier: PRESCOTT CITY OF · 42,217 people · 2023 | 2/17 | UCMR-5 |
| PFHXS | 0.0065 µg/L No EPA limit set Main supplier: PRESCOTT CITY OF · 42,217 people · 2023 | 2/17 | UCMR-5 |
| Pfhpa | 0.0036 µg/L No EPA limit set Main supplier: PRESCOTT CITY OF · 42,217 people · 2023 | 1/17 | UCMR-5 |
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
| Supplier | Population served |
|---|---|
| PRESCOTT CITY OF | 42,217 |
| DIAMOND VALLEY WATER DISTRICT | 2,000 |
| GRANITE OAKS WATER USERS ASSOCIATION | 1,200 |
| PONDEROSA PARK DWID | 602 |
| BRADSHAW WATER COMPANY INC | 510 |
| INSCRIPTION CANYON WATER COMPANY | 507 |
| HIGHLAND PINE DWID | 450 |
| GRANITE MOUNTAIN WATER COMPANY | 381 |
| ACME WATER -DELLS WATER | 163 |
| HOLIDAY HILLS DWID | 150 |
| AMERICAN RANCH DWID | 140 |
| BEVERLY GARDENS TRAILER PARK | 120 |
| LAKESIDE WATER COMPANY | 55 |
| PINEHURST WATER COMPANY | 54 |
| GRANITE DELLS WATER COMPANY | 50 |
| MANNEKEN APARTMENTS | 34 |
| JACKSON ACRES DWID | 30 |
Frequently asked questions about Prescott tap water
Is Prescott tap water safe to drink?
EPA testing detected 37 contaminants in the water serving Prescott. 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?
17 public water suppliers report drinking-water monitoring for Prescott, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Prescott's water?
The contaminants EPA monitoring detected in Prescott include Nitrate-Nitrite, Nitrate, Copper, Fluoride, Barium. 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.