Water quality · AZ
Arizona Water Quality (2026)
Last updated: June 2026
An estimated 6M+ residents affected by contamination. Up to 670 utilities reported elevated nitrate, arsenic and chromium-6.
Our Arizona coverage focuses on the 6 metros below. Each city page lists the utility's water source, hardness in grains per gallon, contaminants flagged above EWG's stricter health guideline, and the whole-house system that fits that specific profile, not a generic recommendation copied across the state.
Common contaminants flagged across Arizona
Across the Arizona cities we cover, these are the contaminants most often reported above EWG's health guideline. None exceed federal EPA legal limits.
- chromium-6
- arsenic
- Chromium-6
- PFAS (near military bases)
- Arsenic
- disinfection byproducts
Cities we cover in Arizona
| City | Hardness | Flagged above EWG guideline | Best fit |
|---|---|---|---|
| Chandler | 12-17 | chromium-6 | Softener + carbon |
| Gilbert | 12-17 | chromium-6 | Softener + carbon |
| Mesa | 12-17 | chromium-6, arsenic | Salt-based softener + catalytic carbon; POU RO for drinking |
| Phoenix | 12–17 (very hard) | Chromium-6, PFAS (near military bases), Arsenic | Salt-based softener + catalytic carbon filter, plus point-of-use RO for drinking |
| Scottsdale | 12-16 | chromium-6, arsenic | Softener + carbon; POU RO for drinking |
| Tucson | 7-12 | chromium-6, arsenic, disinfection byproducts | Whole-house carbon plus softener; POU RO if EWG flags persist |
Recommended systems for Arizona
Most Arizona homes benefit from a layered setup: whole-house carbon for chlorine and taste, a softener if your CCR shows hardness above 7 gpg, and a certified under-sink RO at the kitchen tap if lead, PFAS, nitrate or arsenic are flagged.
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Find your system →Arizona water FAQ
+Is Arizona tap water safe to drink?
Yes, by federal standards: the cities on this page all meet every EPA legal limit. The contaminants we flag sit above EWG's stricter, non-enforceable health guideline, which is the benchmark most homeowners use when deciding whether to filter further at home.
+Why is Arizona water hard?
Hardness comes from calcium and magnesium picked up as water moves through local geology. In Arizona, the values vary city by city, see the table above for your metro. Anything above 7 grains per gallon is considered hard and is where a softener starts to make a noticeable difference.
+Do I need a softener or a filter in Arizona?
Different problems, different tools. A whole-house carbon filter handles chlorine, chloramine and taste. A softener handles scale from hard water. Many Arizona homes benefit from both, and a kitchen-tap RO if lead, PFAS or nitrate appear on your CCR.
Sources: Clearly Filtered 2025