Water Treatment Companies in Arizona

Arizona well water is among the most mineral-laden in the United States. Hardness, arsenic, total dissolved solids, and sulfur compounds are routine findings on well water tests across the state. Two water treatment companies are listed in this directory, both operating in the Phoenix metro, but the need for treatment extends statewide.

Arizona’s Most Common Water Quality Problems

Before selecting a water treatment system, a proper water test is essential. In Arizona, these issues appear with the highest frequency:

Hardness (Calcium and Magnesium)

Arizona groundwater is almost universally hard. In the Phoenix metro, hardness commonly runs 300–500 mg/L as CaCO₃ (very hard), and some wells exceed 700 mg/L. Hard water scales water heaters, clogs faucet aerators, reduces soap effectiveness, and significantly shortens appliance life.

Treatment: Ion-exchange water softeners are the standard solution. Salt-based softeners remain the most effective option; salt-free “conditioners” may reduce scale but do not remove hardness ions.

Arsenic

Naturally occurring arsenic is the most serious inorganic contaminant in Arizona groundwater. The ADWR and ADEQ both track arsenic exceedances of the EPA MCL of 10 µg/L (10 parts per billion). In volcanic rock terrain (parts of Yavapai, Maricopa, and Yuma counties) and in alluvial basins near geothermal activity, arsenic levels can range from 10 to over 100 µg/L.

Treatment: Point-of-use reverse osmosis (RO) systems are highly effective, removing 90–99% of arsenic. Whole-house anion exchange or activated alumina systems are options for higher-demand applications.

Total Dissolved Solids (TDS)

Many Arizona wells have TDS in the 500–2,000 mg/L range, well above the EPA’s secondary MCL of 500 mg/L. High TDS produces a salty or bitter taste and accelerates corrosion in plumbing and appliances.

Treatment: Reverse osmosis at the drinking water point of use is the most practical solution for residential TDS reduction. Whole-house RO is used for agricultural and some commercial applications but is expensive.

Nitrates

Agricultural areas in Maricopa, Pinal, and Cochise counties show elevated nitrate levels in some shallow wells. Nitrate at concentrations above 10 mg/L as nitrogen poses a health risk to infants and is an indicator of agricultural contamination.

Treatment: RO, ion exchange (anion exchange), or distillation.

PFAS Contamination

PFAS (per- and polyfluoroalkyl substances) have been detected near military installations and certain industrial sites. Luke Air Force Base (northwest Phoenix/Goodyear area) and Davis-Monthan AFB (Tucson) have documented PFAS groundwater plumes. ADEQ maintains a public PFAS tracker.

Treatment: Activated carbon (GAC) filtration or RO systems. Both are effective at PFAS removal at home scales.

Iron and Manganese

Less common in the hot desert valleys but more prevalent in northern Arizona (Coconino, Navajo counties), iron and manganese cause staining, taste problems, and fouling of water softener resin.

Treatment: Oxidizing filters (greensand, Birm, or catalytic carbon), aeration, or chlorination followed by filtration.

What Water Treatment Companies Provide

Water testing (basic mineral panel, bacteria, nitrate, arsenic, and specialty tests)
System design based on test results and household demand
Installation of softeners, RO systems, UV disinfection units, sediment and carbon filters, and whole-house filtration
Ongoing maintenance, salt delivery, filter replacement, and resin regeneration
Annual system inspections to ensure continued effectiveness

Cost of Water Treatment in Arizona

System Type	Typical Installed Cost	Annual Maintenance
Salt-based water softener	$800–$2,500	$100–$300 (salt)
Point-of-use RO system	$300–$800	$50–$150 (filters)
Whole-house RO	$5,000–$20,000+	$500–$2,000
UV disinfection system	$500–$1,500	$100–$200 (lamp)
Sediment + carbon filter	$400–$1,200	$100–$300
Iron/manganese filter	$1,000–$3,500	$200–$600

For an Arizona well home with typical hard water + arsenic issues, a softener + point-of-use RO combination runs $1,500–$3,500 installed.

Water Treatment Companies in Arizona

Advanced Water Systems & Plumbing Services LLC — Phoenix, Maricopa County Residential and commercial water treatment systems, including softeners and filtration for Arizona well water. Phone: (602) 993-5771 | advwatersys.com

Water Treatment Technologies — Phoenix, Maricopa County Industrial and commercial water treatment systems across the Phoenix metro area. Phone: (602) 275-8280 | wttaz.com

Always get a comprehensive water test before purchasing any treatment system. ADEQ-certified labs in Arizona can be found at azdeq.gov.