Water Treatment in Maricopa County, AZ

About the water in Maricopa County

Most Maricopa County utilities blend Salt River Project surface water with Colorado River water delivered through the Central Arizona Project (CAP) canal, with a smaller share from groundwater wells. The blend varies by city and by treatment plant, and it drives most of the local hardness and total dissolved solids load. (water source reference)

USGS classifies most Maricopa County tap water as very hard, generally above 180 mg/L as calcium carbonate. City of Phoenix publishes a service-area range of 9 to 20 GPG depending on the SRP or CAP source and treatment plant, and per-city finished water numbers in /lib/cities.ts sit inside that range across Phoenix, Scottsdale, Mesa, and the East Valley suburbs. Every install starts with a free in-home test before sizing. (USGS hardness map)

Utilities serving Maricopa County

• City of Phoenix Water Services Water Quality Reports, water quality and Consumer Confidence Reports
• City of Scottsdale Water, water quality and Consumer Confidence Reports
• City of Mesa Water Resources, water quality and Consumer Confidence Reports
• City of Chandler Water Quality, water quality and Consumer Confidence Reports
• Town of Gilbert Water, water quality and Consumer Confidence Reports
• City of Tempe Water Quality, water quality and Consumer Confidence Reports
• City of Glendale Water Services, water quality and Consumer Confidence Reports
• City of Peoria Water Services, water quality and Consumer Confidence Reports

Common local concerns

• Calcium and magnesium hardness from the SRP and CAP blend
• Elevated total dissolved solids from Colorado River share
• Chlorine or chloramine disinfection residual depending on the utility
• Per-plant variation across the Phoenix metro

Regulators and source data

• Arizona Department of Environmental Quality (ADEQ) Drinking Water
• EPA Safe Drinking Water Information System

Cities we serve in Maricopa County

Each city below has its own service pages with water-quality detail specific to the local utility.

Nearby counties we serve

• San Bernardino County, CA

  4 cities served

• Clark County, NV

  2 cities served