What was found in Phoenix'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 | 7100 µg/L 71% of the EPA limit 10000 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019
Highest in the city: 7825 µg/L — ORANGEWOOD MOBILE HOME PARK · 500 people · 2019 | 9/9 | SYR4 |
| Nitrate-Nitrite | 800 µg/L 8% of the EPA limit 10000 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019
Highest in the city: 5981.5 µg/L — ADJC ADOBE MOUNTAIN SCHOOL · 680 people · 2018 | 6/9 | SYR4 |
| Fluoride | 778.5 µg/L 19% of the EPA limit 4000 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019
Highest in the city: 937 µg/L — ADJC ADOBE MOUNTAIN SCHOOL · 680 people · 2019 | 7/9 | SYR4 |
| Copper | 682.6 µg/L 53% of the EPA limit 1300 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2018 | 9/9 | SYR4 |
| Chlorite | 317.95 µg/L 32% of the EPA limit 1000 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 1/9 | SYR4 |
| Lithium | 160 µg/L No EPA limit set Main supplier: PHOENIX CITY OF · 1,695,000 people · 2023 | 3/9 | UCMR-5 |
| Barium | 120.85 µg/L 6% of the EPA limit 2000 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 6/9 | SYR4 |
| TTHM | 64 µg/L 80% of the EPA limit 80 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 7/9 | SYR4 |
| Lead | 7.75 µg/L 52% of the EPA limit 15 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2018
Highest in the city: 50.6 µg/L — ADJC ADOBE MOUNTAIN SCHOOL · 680 people · 2019 | 8/9 | SYR4 |
| Chromium | 46.4 µg/L 46% of the EPA limit 100 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 6/9 | SYR4 |
| Total Haloacetic Acids (HAA5) | 23.88 µg/L 40% of the EPA limit 60 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 5/9 | SYR4 |
| Arsenic | 7.465 µg/L 75% of the EPA limit 10 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019
Highest in the city: 15.18 µg/L — FEDERAL CORRECTION INSTITUTION · 1,500 people · 2019 | 8/9 | SYR4 |
| Bromate | 10 µg/L 100% of the EPA limit 10 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 1/9 | SYR4 |
| Combined Uranium | 4.8 µg/L 16% of the EPA limit 30 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 2/9 | SYR4 |
| Selenium | 3.36 µg/L 6.7% of the EPA limit 50 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019
Highest in the city: 3.825 µg/L — FEDERAL CORRECTION INSTITUTION · 1,500 people · 2018 | 2/9 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.3 pCi/L 15% of the EPA limit 15 pCi/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019
Highest in the city: 3.7 pCi/L — EPCOR - NORTH EAST AGUA FRIA · 14,723 people · 2017 | 2/9 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.1 µg/L 35% of the EPA limit 6 µg/L Highest in the city: 67 AVE PROPERTY OWNERS ASSOCIATION · 40 people · 2019 | 1/9 | SYR4 |
| Combined Radium (-226 And -228) | 2.08 pCi/L 42% of the EPA limit 5 pCi/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 2/9 | SYR4 |
| Dibromoacetic Acid | 1.9 µg/L No EPA limit set Highest in the city: FEDERAL CORRECTION INSTITUTION · 1,500 people · 2019 | 1/9 | SYR4 |
| Bromoform | 1.6 µg/L No EPA limit set Highest in the city: ADJC ADOBE MOUNTAIN SCHOOL · 680 people · 2019 | 1/9 | SYR4 |
| Dichloroacetic Acid | 1.485 µg/L No EPA limit set Highest in the city: FEDERAL CORRECTION INSTITUTION · 1,500 people · 2019 | 1/9 | SYR4 |
| Xylenes, Total | 1.05 µg/L 0% of the EPA limit 10000 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 1/9 | SYR4 |
| 2,4-D | 0.3800 µg/L 0.5% of the EPA limit 70 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 1/9 | SYR4 |
| Picloram | 0.1900 µg/L 0% of the EPA limit 500 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 1/9 | SYR4 |
| Thallium, Total | 0.0600 µg/L 3% of the EPA limit 2 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 1/9 | SYR4 |
| Benzo(A)Pyrene | 0.0400 µg/L 20% of the EPA limit 0.2000 µg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2019 | 1/9 | SYR4 |
| PFBS | 0.0160 µg/L No EPA limit set Main supplier: PHOENIX CITY OF · 1,695,000 people · 2023 | 1/9 | UCMR-5 |
| Lead | 0.0027 mg/L 18% of the EPA limit 0.0150 mg/L Main supplier: PHOENIX CITY OF · 1,695,000 people · 2024
Highest in the city: 0.0140 mg/L — MICHIGAN TRAILER PARK · 400 people · 2024 | 9/9 | LCR |
| Pfba | 0.0060 µg/L No EPA limit set Main supplier: PHOENIX CITY OF · 1,695,000 people · 2023 | 1/9 | 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 Phoenix
| Supplier | Population served |
|---|---|
| PHOENIX CITY OF | 1,695,000 |
| EPCOR - NORTH EAST AGUA FRIA | 14,723 |
| ROSE VALLEY WATER COMPANY | 6,202 |
| FEDERAL CORRECTION INSTITUTION | 1,500 |
| ADJC ADOBE MOUNTAIN SCHOOL | 680 |
| ORANGEWOOD MOBILE HOME PARK | 500 |
| MICHIGAN TRAILER PARK | 400 |
| BEARDSLEY WATER COMPANY 3 | 96 |
| 67 AVE PROPERTY OWNERS ASSOCIATION | 40 |
Frequently asked questions about Phoenix tap water
Is Phoenix tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Phoenix. 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 Phoenix?
9 public water suppliers report drinking-water monitoring for Phoenix, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Phoenix's water?
The contaminants EPA monitoring detected in Phoenix include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Chlorite. 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.