Mesa Water Quality Report
Population: 520K+ · TDS: 500+ ppm · 5 contaminants above EWG health guidelines
Water Hardness
Mesa water measures 17.1 grains per gallon (gpg) — classified as Extremely Hard.
Contaminants Detected
All contaminants shown exceed EWG health guidelines, even if they meet federal legal limits. The worst offender exceeds guidelines by 867x.
| Contaminant | Detected | EWG Guideline | Times Above |
|---|---|---|---|
Haloacetic Acids (HAA9) Disinfection byproducts formed when chlorine reacts with organic matter. Linked to increased cancer risk. | 52.0 ppb | 0.06 ppb | 867x |
Arsenic Naturally occurring in Arizona groundwater. A known human carcinogen even at very low levels. | 1.95 ppb | 0.01 ppb | 195x |
Chromium-6 Industrial and naturally occurring contaminant. Linked to cancer with no enforceable federal limit. | 0.63 ppb | 0.03 ppb | 21x |
Vanadium Toxic metal found in Arizona groundwater. Linked to developmental and reproductive toxicity. | 6.8 ppb | 0.1 ppb | 68x |
Total Trihalomethanes (TTHMs) Disinfection byproducts associated with bladder cancer and adverse reproductive outcomes. | 34.8 ppb | 0.2 ppb | 174x |
What This Means For You
Mesa's water is legally “safe” according to federal standards — but those standards were last updated decades ago. The EWG sets health guidelines based on the latest science, and Mesa exceeds them on 5 contaminants.
With a hardness level of 17.1 gpg, your water is classified as extremely hard. That means accelerated scale buildup in your pipes, water heater, and appliances. Most water heaters in Mesa lose 25–40% of their efficiency within 5 years from hard water deposits.
Recent: Mesa's water supply shows some of the highest arsenic levels in the metro area, exceeding EWG guidelines by nearly 200x.
Flo Says:
City data shows averages across the whole system. Your home could be better or worse depending on your pipes, neighborhood, and how far you are from the treatment plant. A free in-home test shows you exactly what's coming out of your tap.
Book Your Free Water Test in Mesa
City reports show averages. A free in-home test shows you exactly what's coming out of your tap.
Book Your Free Water Test