Phoenix
AZ

Is Phoenix, AZ Tap Water Safe to Drink?

Phoenix, AZ tap water has a notable concern: lithium has been detected above EPA health benchmarks in nearly all ZIP codes tested, with levels reaching as high as 160 µg/L against a 10 µg/L reference value. Several PFAS compounds were also detected, though none exceeded guideline levels. If you are in a sensitive group, a certified filter is worth considering.

9Water systems
52ZIP codes
96.2%ZIPs above EPA guideline
Metro areaPhoenix-Mesa-Chandler, AZ
Latest data2025-12-01

Where Does Phoenix Get Its Water?

Phoenix, AZ draws its drinking water from a combination of surface water and groundwater sources across the greater Phoenix-Mesa-Chandler metro area. Several utilities serve different parts of the city and surrounding communities, with the City of Phoenix being the largest provider. Other systems include the City of Scottsdale, the City of Glendale, the City of Avondale, the City of Tolleson, EPCOR Water serving the Anthem area, and Desert Hills Water.

Phoenix's own water system operates multiple treatment plants, including the Cholla Water Treatment Plant, Pyramid Peak Water Treatment Plant, and the Oasis Water Treatment Plant. Scottsdale operates additional treatment facilities. Together these plants process surface water and groundwater before it reaches your tap.

Some areas are served by smaller or specialized systems. The Gila River Indian Community's Wild Horse Pass area has its own reverse osmosis treatment facility blending well water. EPCOR's Anthem system serves communities north of Phoenix with its own distribution network.

How Is Phoenix Tap Water Treated?

Water in the Phoenix area goes through several treatment steps depending on the utility. Common processes include coagulation, dissolved air flotation, conventional filtration, granular activated carbon filtration, membrane filtration, and biological treatment. These steps remove sediment, organic matter, and many chemical contaminants before water enters the distribution system.

Disinfection methods used across Phoenix-area utilities include free chlorine, chloramines, ozone, and ultraviolet light. Disinfection kills bacteria and viruses, making the water microbiologically safe to drink. Some systems also use ion exchange, which can reduce certain dissolved minerals and contaminants.

Some facilities, particularly those drawing on groundwater, use reverse osmosis or air stripping to address naturally occurring dissolved substances. The diversity of treatment approaches reflects the range of source water qualities across the region's many utilities.

What's in Phoenix Tap Water?

The most significant finding in recent EPA testing is lithium. The highest detected level was 160 µg/L, which is 16 times the EPA's 10 µg/L health reference value. Lithium was detected across 101 ZIP codes in the dataset, and 50 of those ZIPs had levels above that benchmark. This is the primary driver of concern for Phoenix-area tap water.

Several PFAS compounds were also detected in recent EPA samples, including PFTrDA, 6:2 FTS, 8:2 FTS, and PFBA. The highest measured values for each were at or near the laboratory reporting threshold of 0.005 to 0.007 µg/L. None of these detections exceeded EPA guideline levels, so they are not currently a regulatory violation, but their presence is worth knowing about.

Lithium occurs naturally in groundwater and soil in many parts of the American Southwest, which helps explain why it shows up broadly across the Phoenix region. PFAS compounds can enter water supplies from a variety of industrial and consumer product sources and are monitored nationally as part of ongoing EPA efforts.

ContaminantPeak detectedEPA guidelineZIPs detectedStatus
lithium 160 µg/L 10 µg/L 50 ZIPs Above guideline
PFTrDA 0.007 µg/L — 0 ZIPs Within guideline
6:2 FTS 0.005 µg/L — 0 ZIPs Within guideline
8:2 FTS 0.005 µg/L — 0 ZIPs Within guideline
PFBA 0.005 µg/L — 0 ZIPs Within guideline

Health Risk Profile for Phoenix

Lithium is the primary concern here. The EPA has identified 10 µg/L as a health reference value for lithium in drinking water, and Phoenix-area samples reached as high as 160 µg/L. This is not an enforceable federal maximum at this time, but it is a benchmark the EPA uses to flag potential health concerns. At elevated levels, lithium exposure over time has been studied in relation to kidney and thyroid effects.

Infants, pregnant individuals, people with kidney disease, and those on medications that affect lithium metabolism may face greater risk from elevated lithium in drinking water. If you fall into one of these groups, consulting a healthcare provider and considering a certified filter is a reasonable step.

For Phoenix tap water, a filter certified to NSF/ANSI standards (NSF/ANSI is an independent third-party certification that appears on the product label) is worth considering. For lithium, look for a filter certified to NSF/ANSI 58, which covers reverse osmosis systems shown to reduce dissolved minerals. For PFAS, NSF/ANSI 58 and NSF/ANSI P473 cover reduction of the most common PFAS compounds. For chlorine taste or odor, NSF/ANSI 42 applies.

The PFAS compounds detected in Phoenix-area water were at very low levels, at or near the minimum the lab can reliably measure, and none exceeded EPA guideline values. The science on low-level PFAS exposure is still evolving, and the EPA continues to update its guidance. Lithium in drinking water is also an active area of research, and the 10 µg/L reference value reflects current scientific thinking, not a final regulatory determination.

Best Broad-Spectrum Filters for This Water Profile

This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.

Waterdrop G3P600 Reverse Osmosis System
Under-sink RO system

8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.

See recommendations matched to your exact address: choose your ZIP code below.

Frequently Asked Questions about Phoenix Tap Water

Is Phoenix tap water safe to drink?

Phoenix tap water meets federal rules for most regulated contaminants, but lithium has been detected at levels above the EPA's 10 µg/L health reference value in nearly all ZIP codes tested, with a peak of 160 µg/L. This benchmark is not yet an enforceable legal limit, but it signals a real concern, especially for sensitive groups like infants, pregnant individuals, and people with kidney conditions.

What contaminants are in Phoenix tap water?

The top concern is lithium, detected at up to 160 µg/L against an EPA reference value of 10 µg/L. Several PFAS compounds were also found, including PFTrDA, 6:2 FTS, 8:2 FTS, and PFBA, but all were at or near the minimum detectable level and below EPA guideline values. Disinfection byproducts from chlorine and chloramine treatment are also present across the system.

Where does Phoenix get its drinking water?

Phoenix and the surrounding metro area draw water from both surface water and groundwater sources. The City of Phoenix operates treatment plants including the Cholla, Pyramid Peak, and Oasis facilities. Other utilities, including the City of Scottsdale, City of Glendale, City of Avondale, City of Tolleson, EPCOR Water, and Desert Hills Water, serve different parts of the broader metro area.

Do I need a water filter in Phoenix?

Given the elevated lithium levels, a filter certified to NSF/ANSI 58 (reverse osmosis) is a practical option for households with infants, pregnant individuals, or people with kidney issues. For PFAS, look for NSF/ANSI 58 or P473 certification. For chlorine taste and odor, NSF/ANSI 42 covers that. NSF/ANSI certification is an independent third-party label you can find on the product packaging.

How often is Phoenix tap water tested?

Phoenix-area utilities are tested regularly under EPA monitoring programs. The most recent data in this report comes from samples collected through late 2025. The EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR5) required utilities nationwide to test for lithium and PFAS compounds, which is how these substances were measured across the Phoenix metro area.

What is the best water filter for Phoenix?

For Phoenix tap water, a reverse osmosis system certified to NSF/ANSI 58 is the strongest option. It reduces lithium and most PFAS compounds effectively. If PFAS is your main concern, also check for NSF/ANSI P473 certification on the label. For chlorine taste or odor without a full reverse osmosis setup, a pitcher or faucet filter certified to NSF/ANSI 42 can help with taste.

Tap water reports by ZIP in Phoenix

Water utilities serving Phoenix, AZ

Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.

Modeled boundaries are shown with a dashed outline.

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