Is Tap Water Safe to Drink in Mesa?
Yes, tap water in Mesa is safe to drink. The city blends Salt and Verde River water, Colorado River water from the Central Arizona Project, and groundwater, all treated to meet EPA standards. Like most of the Valley, it is very hard.
Water Source
The City of Mesa treats surface water from the Salt and Verde Rivers (delivered by the Salt River Project) and Colorado River water from the Central Arizona Project canal, supplemented by city groundwater wells during peak demand.
EPA Compliance Status
Meets all federal Safe Drinking Water Act standards. Mesa operates multiple treatment plants and blends sources seasonally.
Notable Contaminants & Context
- •High natural mineral content (hardness, TDS) from desert river sources affects taste and appliances but not safety
- •Arsenic occurs naturally in some Arizona groundwater; Mesa's wells are treated or blended to stay within the federal limit
- •Disinfection byproducts are monitored and compliant; summer algae in canals can cause harmless earthy tastes
Water Quality Data
Key contaminants detected vs. regulatory limits. All values from the most recent published report — Source: City of Mesa Water Resources 2024 CCR.
| Contaminant | Detected | Limit | Status |
|---|---|---|---|
| Chlorine (total) | 1.7 mg/L | 4.0 mg/L | ✓ |
| Fluoride | 0.7 mg/L | 4.0 mg/L | ✓ |
| Lead (90th percentile) | 2.6 µg/L | 15.0 µg/L | ✓ |
| Nitrate (as N) | 2.1 mg/L | 10.0 mg/L | ✓ |
| TTHM (Total Trihalomethanes) | 32.4 µg/L | 80.0 µg/L | ✓ |
| HAA5 (Haloacetic Acids) | 22.7 µg/L | 60.0 µg/L | ✓ |
✓ = below limit ⚠ = above health goal ✗ = exceeds guideline
How It Compares
Mesa's water profile closely matches Phoenix's: the same Salt, Verde and Colorado River sources, the same very hard desert water, and the same full EPA compliance.
Tips
- •A softener or reverse-osmosis unit is popular for taste and appliance protection, not safety
- •Seasonal earthy taste from canal algae is harmless and fades chilled or filtered
- •Mesa's annual report shows the source blend for your area
Frequently Asked Questions
Sources & References
The safety rating and guidance on this page draw on the following sources. See our full methodology.
- •US EPA Safe Drinking Water Act regulations
- •EWG Tap Water Database
- •The utility's most recent Consumer Confidence Report (CCR)
- •WHO Guidelines for Drinking-water Quality