Scottsdale, Arizona
Scottsdale Water Quality
Scottsdale water meets federal standards, and hardness still sits at 13 to 17 grains depending on which side of Indian School Road you are on. The Superfund wells are treated; the white spots on the glass are not.
In 2024 Scottsdale measured arsenic up to 8.4 ppb, TTHM averaging 52.8 ppb, and hardness of 13 to 17 grains per gallon in three neighbourhood bands. All of it met federal limits. The useful question is which of those is actually at your tap.
The short answer
Scottsdale Water, public water system AZ0407098, is 72 percent Colorado River (CAP), 14 percent Salt and Verde (SRP), 9 percent recycled for irrigation and recharge, and 5 percent groundwater — including wells in the North Indian Bend Wash Superfund area that run through granular activated carbon for trichloroethylene. The 2025 report covers 2024 monitoring.
What households notice is hardness in the 13 to 17 grain band, published by neighbourhood, and the chlorine byproducts that come with treating canal water. Reverse osmosis, carbon and a softener are three different answers. A Superfund headline is not a specification.
Get a free test
Tell us your Scottsdale-area address. We confirm coverage first, then schedule a licensed technician to test at your tap — no charge, no obligation.
What filtration does — and does not
The plant already uses granular activated carbon on surface water. A household stage still has to match the finding: hardness, arsenic and byproducts are not one product.
Which water system serves you?
Enter a ZIP code. We will name the utility that supplies it and its public water system identifier, so you can look up that system's own annual report. No contact details needed for this part.
Phoenix-metro ZIP codes are covered here. Five digits will do it.
A licensed technician tests at your own tap and tells you which findings actually apply to your house — including when the answer is none of them. Coverage is confirmed per service area rather than promised as blanket availability.
Where Scottsdale water comes from
The 2024 portfolio is in the CCR: 72 percent CAP, 14 percent SRP, 9 percent recycled, 5 percent groundwater. Recycled water is not currently a potable blend.
Colorado River via CAP — 72 percent
Treated at the CAP Water Treatment Plant on the Scottsdale Water Campus (up to 70 million gallons a day). CAP I and II are conventional; CAP III is ultrafiltration membrane. Granular activated carbon is there for taste, odour and disinfection byproducts. This is the dominant 2024 supply.
Salt and Verde Rivers via SRP — 14 percent
Treated at the Chaparral Water Treatment Plant near Hayden and McDonald, ultrafiltration plus granular activated carbon, 27 million gallons a day. A different watershed from CAP, which is one reason hardness and byproducts are reported as ranges rather than a single city number.
Groundwater, including North Indian Bend Wash — 5 percent
Twenty-one active wells. Two treatment plants — the Central Groundwater Treatment Facility and the North Indian Bend Wash granular activated carbon plant — treat Superfund-site groundwater for trichloroethylene. Those plants were built by the parties the EPA deemed potentially responsible; they pay operating costs. The water is treated to levels that exceed federal and state drinking water standards under EPA, ADEQ and Maricopa County oversight. That is a treatment story, not a reason to avoid the tap.
What the 2025 report actually says
Federal MCLs are fixed. The ranges are from Scottsdale Water's 2025 report of 2024 compliance monitoring for PWS ID AZ0407098. A later CCR supersedes them.
Arsenic
Naturally occurring. The federal MCL is 10 ppb, based on a running annual average. The 2025 report (2024 monitoring) lists a low of 1.1 ppb, a high of 8.4 ppb, a system average of 4.1 ppb and a highest running annual average of 8.4 ppb. Reverse osmosis addresses it; carbon filtration does not.
Total trihalomethanes (TTHM)
Disinfection byproducts from chlorinating surface water. Federal MCL 80 ppb. The report lists 20.1 to 54.6 ppb with a locational average of 52.8 ppb. Scottsdale uses granular activated carbon at the CAP plant specifically to reduce the organic matter that forms them.
Haloacetic acids (HAA5)
Federal MCL 60 ppb. The report lists 3.8 to 13.0 ppb with a locational average of 10.2 ppb — well below the limit, and still the reason carbon is in the treatment train. A softener does not address it.
Uranium and chromium
Uranium (2024): not-detected to 14 ppb against a federal MCL of 30 ppb, system average 4.2. Total chromium: not-detected to 26.9 ppb against 100 ppb, system average 9.2. Both are dissolved inorganics. Reverse osmosis is the residential option; neither is a reason to panic on a compliant system.
Hardness by neighbourhood band
Not a health contaminant. The 2025 report publishes three bands: south of Indian School Road, 13 to 15 grains per gallon (230 to 260 ppm); Indian School to Chaparral Road, 13 to 17 gpg (215 to 285 ppm); north of Chaparral Road, 13 to 17 gpg (230 to 290 ppm). The City states outright that additional hardness treatment at the plant would not be cost-effective, because most residential use here is outdoor.
What we are not putting on this page
A reading for your address, a Superfund scare, or a claim that recycled water is in your drinking glass today. Recycled water currently irrigates turf and recharges the aquifer. Potable reuse is described in the CCR as a plan, with a possible blend as early as 2029 — not as a present fact.
Where these figures come from
Every concentration on this page is taken from the utility's own 2025 Water Quality Report (2024 monitoring). Independent compilations exist; they are not the source used here.
- Scottsdale Water 2025 Water Quality Report (PDF) — Consumer Confidence Report for PWS ID AZ0407098.
- Scottsdale Water Quality Reports
- EPA National Primary Drinking Water Regulations
- EPA SDWIS Federal Reports — search AZ0407098.
Matching treatment to the finding
The plant will not soften for you. Superfund treatment is already happening on the wells that need it. What is left is a household decision based on a tap test.
Reverse osmosis, at the tap
Addresses dissolved inorganics — arsenic, uranium, chromium. Under-sink for drinking and cooking. Not a whole-house hardness solution.
Activated carbon
The plant already uses GAC on surface water. A household carbon stage is still the right answer for remaining chlorine byproducts and taste. It does not remove arsenic.
Ion-exchange softener
The answer to 13 to 17 grain water, which is what spots glass and shortens water-heater life. The City will not centralise softening; that decision is in the CCR. A household softener is a plumbing modification and it adds sodium.
Sometimes nothing
If a test comes back unremarkable, that is the finding. Safe-yield and Superfund treatment are reasons the supply is carefully managed, not reasons a filter is mandatory.
How the free test works
A licensed technician tests at your kitchen tap, walks the plumbing, and tells you which of the problems above applies to your house and which does not. No charge, no obligation.
Seamless Home is the licensed contractor of record. Installation is performed by vetted installing partners engaged as our subcontractors. Coverage is confirmed per service area rather than promised as blanket availability.
Scottsdale water, answered plainly
Is Scottsdale tap water safe to drink?+
Scottsdale Water treats to federal standards, public water system identifier AZ0407098, and publishes the results in its annual Water Quality Report. The 2025 report covers 2024 monitoring. A compliant system can still contain compounds a household would rather filter. That is a statement about how federal limits are set, not an allegation about the utility.
What does the North Indian Bend Wash Superfund site mean for my tap?+
A small share of Scottsdale's supply is groundwater, and some of those wells are in the North Indian Bend Wash area historically contaminated with trichloroethylene. The City operates GAC treatment built and funded by the potentially responsible parties, with EPA, ADEQ and Maricopa County oversight, and states that the treated water exceeds federal and state drinking water standards. Superfund in the aquifer is not the same thing as Superfund in the glass. A test at your tap is still the way to know what is actually there.
Why does hardness change at Indian School Road?+
Because the blend of CAP, SRP and well water is not uniform across the city. The 2025 CCR publishes three hardness bands split at Indian School Road and Chaparral Road, all in the 13 to 17 grain range. Outdoor irrigation is most of residential use, which is why the City does not soften at the plant. Indoor spotting and water-heater scale are a household problem, not a plant problem.
Is recycled water in Scottsdale drinking water?+
Not as a current potable blend. The Advanced Water Treatment Plant produces water used for turf irrigation and aquifer recharge — more than 70 billion gallons injected since 1998, which is how Scottsdale became the first Arizona city to reach safe yield (more water into the aquifer than it takes out) in 2006. The CCR describes a possible purified potable blend as early as 2029. That is a plan, and we are not reporting it as a present fact.
How do I find the measured numbers for my system?+
The 2025 Scottsdale Water Quality Report is the Consumer Confidence Report. Search EPA SDWIS under AZ0407098. Those are system-level figures from 2024 monitoring. They do not describe your service line or a softener already installed.
What does treatment cost in Scottsdale?+
It depends on which equipment your results justify. We do not publish a figure for your house on a web page. The test is free and the conversation that follows is based on what the test found.
Who does the installation, and who is responsible afterwards?+
Seamless Home is the licensed contractor of record. Installation is performed by vetted installing partners engaged as our subcontractors, and the workmanship obligation stays with us. Coverage is confirmed per service area rather than promised as blanket availability.
Related resources
Home water purification and treatment
The national service page: what each treatment stage removes, and why a test comes first.
Learn more →Phoenix water quality
The Phoenix CCR page: same valley, different utility.
Learn more →Mesa water quality
Three zones, Val Vista versus Signal Butte, hardness that jumps from 12 to 16 grains.
Learn more →Chandler water quality
Arsenic up to 9.5 ppb and TTHM samples up to 77 ppb in the 2025 Chandler CCR.
Learn more →All homeowner services
Water treatment, battery backup, HVAC and solar under one licensed contractor of record.
Learn more →Get a free test at your tap
A licensed technician tests at your kitchen tap and tells you which of the problems above applies to your house — and which does not. Coverage confirmed at your address first.
Get a free test