Tap water · AZ
Tucson Water
EPA system ID AZ0410112 · serves about 732,906 people. Every US utility must publish an annual water quality report — here’s the official one (2025), and below it, our plain-English translation.
Read the official report →What Tucson Water found in 2025
19 detected analytes from the utility’s own annual report, hand-normalized — 1 was near or over a limit (flagged below).
| Detected | Level | Limit | % of limit | Status |
|---|---|---|---|---|
| Arsenic | 8.8 ppb | 10 ppb | 88% | Near limit |
| Nitrate | 6.7 ppm | 10 ppm | 67% | Within limit |
| Uranium | 16 ppb | 30 ppb | 53% | Within limit |
| Alpha Emitters | 4.4 pCi/L | 15 pCi/L | 29% | Within limit |
| Combined Radium (-266 and -228) | 1.44 pCi/L | 5 pCi/L | 29% | Within limit |
| Chlorine | 1 ppm | 4 ppm | 25% | Within limit |
| Fluoride | 0.8 ppm | 4 ppm | 20% | Within limit |
| Total Trihalomethanes (TTHM) | 13.6 ppb | 80 ppb | 17% | Within limit |
| Copper (90th percentile) | 0.135 ppm | 1.3 ppm | 10% | Within limit |
| Selenium | 4.3 ppb | 50 ppb | 9% | Within limit |
| Barium | 0.15 ppm | 2 ppm | 8% | Within limit |
| Lead (90th percentile) | 0.65 ppb | 15 ppb | 4% | Within limit |
| Atrazine | 0.09 ppb | 3 ppb | 3% | Within limit |
| Haloacetic Acids (HAA5) | 1.3 ppb | 60 ppb | 2% | Within limit |
| Simazine | 0.05 ppb | 4 ppb | 1% | Within limit |
| Sodium | 70.4 ppm | — | — | No federal limit |
| Lithium | 14.8 ppb | — | — | No federal limit |
| E. Coli | 1 | 0 | — | No federal limit |
| Perfluorobutanoic Acid (PFBA) | 0.05 ppt | — | — | No federal limit |
Levels and limits are as printed in the utility’s report (“limit” is the EPA MCL, action level, residual limit, or secondary guideline that applies to that row; “ND” = not detected). Utilities publish these reports annually — we re-check every covered utility each July, after the federal publication deadline. Detected doesn’t mean dangerous — most detections sit far below their limits. This is education, not medical advice.
Your tap, if it were a bottle
How Tucson Water water stacks up against the bottled aisle
Same minerals, same units — the tap values below come from the utility’s report, placed next to the closest match in our bottled-water database.
| Mineral | Your tap | Closest bottled match |
|---|---|---|
| Sodium | 70.4 mg/L | Mattoni at 69.9 mg/L |
Tap values are the headline levels from the utility’s annual report (often a highest or average figure); bottled values are label- or report-derived. A closest match is a numeric comparison, not an equivalence or an endorsement.
Zip codes covered
85701 · 85706 · 85710 · 85711 · 85712 · 85713 · 85714 · 85715 · 85716 · 85718 · 85719 · 85730 · 85745 · 85746 · 85748 · 85756 · 85757
Boundary zips partially served by other systems are deliberately unlisted — check your exact zip.