Tempe Water Quality Report
Population: 185K+ · TDS: 350–500 ppm · 4 contaminants above EWG health guidelines
Water Hardness
Tempe water measures 10 grains per gallon (gpg) — classified as Hard.
Contaminants Detected
All contaminants shown exceed EWG health guidelines, even if they meet federal legal limits. The worst offender exceeds guidelines by 653x.
| Contaminant | Detected | EWG Guideline | Times Above |
|---|---|---|---|
Haloacetic Acids (HAA9) Disinfection byproducts present throughout Tempe's water distribution system. | 39.2 ppb | 0.06 ppb | 653x |
Total Trihalomethanes (TTHMs) Linked to bladder cancer. Formed during the chlorine disinfection process. | 31.0 ppb | 0.2 ppb | 155x |
Chromium-6 Detected above health guidelines in Tempe water supply. Associated with cancer risk. | 0.38 ppb | 0.03 ppb | 13x |
Nitrate From agricultural and urban runoff. Dangerous for infants and linked to certain cancers. | 2.8 ppm | 0.35 ppm | 8x |
What This Means For You
Tempe'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 Tempe exceeds them on 4 contaminants.
With a hardness level of 10 gpg, your water is classified as hard. That means accelerated scale buildup in your pipes, water heater, and appliances. Most water heaters in Tempe lose 25–40% of their efficiency within 5 years from hard water deposits.
Recent: Tempe water testing has identified 34 contaminants, with 12 exceeding EWG health guidelines despite meeting legal limits.
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 Tempe
City reports show averages. A free in-home test shows you exactly what's coming out of your tap.
Book Your Free Water Test