Drinking water quality · 2025
· Verified
· PWSID AZ0407025
What's in Phoenix, AZ tap water
1 contaminant in Phoenix, AZ's water sat at or above a federal limit, led by Turbidity at 1.0x the limit.
- !1 contaminant at or above a federal limit — worst is Turbidity at 1.0x
- !2 contaminants within 20% of a limit
- !14 of 27 core regulated contaminants reported — 13 never appear in this report
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −12 contaminants at or above a federal limit
- −8 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −2 health-based violations resolved in the last 5 years
- −8 core regulated contaminants never reported (14/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- Turbidity1.0× the federal limit1 NTU · limit 1 NTU
High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
higher than 85% of U.S. systems
- Chromium87% of the federal limit0–87 ug/L · limit 100 ug/L
higher than 95% of U.S. systems
- TTHM85% of the federal limit4–68 ug/L · limit 80 ug/L
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
higher than 85% of U.S. systems
+26 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Chlorite | 0–0.7 mg/L | 1 mg/L |
| Arsenic | 7 ug/L | 10 ug/L |
| HAA5 | 0.6–26 ug/L | 60 ug/L |
| Nitrate | 3.8 mg/L | 10 mg/L |
| Fluoride | 0.3–1.1 mg/L | 4 mg/L |
| Copper | 0.3 mg/L | 1.3 mg/L |
| Chlorine | 0.84 mg/L | 4 mg/L |
| Lead | 3 ug/L | 15 ug/L |
| Combined Radium | 0–0.8 pCi/L | 5 pCi/L |
| Uranium | 0–4.6 ug/L | 30 ug/L |
| Gross Alpha | 0–1.6 pCi/L | 15 pCi/L |
| Barium | 0.007–0.13 mg/L | 2 mg/L |
| Selenium | 0–2.2 ug/L | 50 ug/L |
| Xylenes | 0.0025 mg/L | 10 mg/L |
| Bromate | Not detected ug/L | 10 ug/L |
| Iron | 0–30 ug/L | — |
| Lithium | 70.2 ug/L | — |
| Sodium | 91–183 mg/L | — |
| Alkalinity | 121–167 mg/L | — |
| Hardness | 172–302 mg/L | — |
| pH | 6.6–8.8 | — |
| Temperature | 47–92 | — |
| TOC | 1.3 | — |
| Total Dissolved Solids | 464–716 mg/L | — |
| PFBA | 6 ng/L | — |
| PFBS | 16 ng/L | — |
What this report doesn't tell you
13 of the 27 contaminants a community water system normally reports do not appear anywhere in Phoenix, AZ's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
PFAS — EPA UCMR5 (2023–2025)
2 PFAS compounds detected in Phoenix, AZ
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFBA
● Detected (no federal limit)PFBS
● Detected (no federal limit)Where your water comes from · EPA SDWIS
Phoenix, AZ's drinking water comes from ground water, drawn from 21 sources.
Source
- WL-55-626582 -
- WL-55-626610 -
- WL-55-626624 -
- WL-55-626625 -
- + 17 more
Treatment
- TP402 - CLO2, 24TH ST
- TP404 - CLO2, VAL VISTA
- TP405 - CLO2, UNION HILLS MOD I
- + 15 more
Distribution
Also buys water from TEMPE CITY OF, GLENDALE CITY OF, and 1 more.
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Maximum contaminant level exceededHealth-based2 violations on record · most recent Aug 2014resolved
- Treatment technique violationHealth-based1 violation on record · most recent Jan 2021resolved
- Other1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗