Anthem Water Hardness & Quality Report (2026)

Anthem, Arizona, in Maricopa County — a large master-planned community in the northern Maricopa County New River-Daisy Mountain corridor along the I-17 freeway, one of the Phoenix metropolitan area's northernmost major suburbs, developed by Del Webb as a signature desert resort community — receives its municipal water from Arizona American Water or EPCOR, which draws from the Central Arizona Project (CAP) Colorado River aqueduct supply and local New River alluvial groundwater wells in the Anthem-Daisy Mountain production zone. Anthem's supply reflects the dual challenge of Arizona's desert water quality: hard Colorado Plateau river water combined with highly mineralized desert alluvial groundwater.

The extremely hard 374.5 mg/L hardness and very high TDS of 1078.9 mg/L place Anthem among the hardest municipal water supplies in this dataset — comparable to Brushy Creek TX (361.5 mg/L, TDS 1065) and exceeding Del City OK (315 mg/L). The CAP Colorado River water carries dissolved minerals from the Colorado Plateau's extraordinarily soluble geology — Permian Kaibab Limestone, Triassic Chinle Formation (gypsum-bearing), Permian Coconino Sandstone, and the Moenkopi Formation (evaporite-rich red beds). The Colorado River's natural salinity from these Permian-Triassic evaporite formations is already high before the CAP diverts it; evaporation in the desert aqueduct transit concentrates minerals further. Local New River alluvial wells add basin-floor groundwater concentrated by centuries of desert evaporation.

At 374.5 mg/L with TDS 1079 mg/L, Anthem residents face extreme water quality challenges. Scale forms within days on all appliances and plumbing — water heaters, tankless heaters, and dishwashers require immediate softening, faucets and shower heads encrust rapidly, and glass shower doors develop permanent etching without daily attention. A whole-house water softener is essentially non-negotiable, and a reverse osmosis (RO) drinking water system is strongly recommended given TDS exceeding 1000 mg/L. The PFAS level of 5.1 ppt is moderate for Maricopa County — the New River corridor's limited military footprint produces a lower PFAS background than Phoenix's Scottsdale or Chandler zones.