Phoenix Water Quality Report
Population: 1.6M+ · TDS: 560–686 ppm · 5 contaminants above EWG health guidelines
Water Hardness
Phoenix water measures 13.5 grains per gallon (gpg) — classified as Very Hard.
Contaminants Detected
All contaminants shown exceed EWG health guidelines, even if they meet federal legal limits. The worst offender exceeds guidelines by 783x.
| Contaminant | Detected | EWG Guideline | Times Above |
|---|---|---|---|
Haloacetic Acids (HAA9) Disinfection byproducts formed when chlorine reacts with organic matter. Linked to increased cancer risk. | 47.2 ppb | 0.06 ppb | 783x |
Total Trihalomethanes (TTHMs) Another class of disinfection byproducts associated with bladder cancer and reproductive issues. | 40.1 ppb | 0.2 ppb | 200x |
Chromium-6 The 'Erin Brockovich' chemical. Linked to cancer even at trace levels. No federal MCL exists. | 0.46 ppb | 0.03 ppb | 15x |
Nitrate Agricultural runoff contaminant. Harmful to infants and linked to certain cancers at elevated levels. | 3.5 ppm | 0.35 ppm | 10x |
Uranium Naturally occurring radioactive element. Toxic to kidneys and linked to increased cancer risk. | 5.2 ppb | 1.7 ppb | 3x |
What This Means For You
Phoenix'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 Phoenix exceeds them on 5 contaminants.
With a hardness level of 13.5 gpg, your water is classified as very hard. That means accelerated scale buildup in your pipes, water heater, and appliances. Most water heaters in Phoenix lose 25–40% of their efficiency within 5 years from hard water deposits.
Recent: Phoenix water utility reported elevated haloacetic acid levels in multiple distribution zones throughout 2024, exceeding EWG health guidelines by over 700x.
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 Phoenix
City reports show averages. A free in-home test shows you exactly what's coming out of your tap.
Book Your Free Water Test