Chandler, Arizona
Chandler Water Quality
Chandler water meets federal standards, with 2025 arsenic reported up to 9.5 ppb and TTHM samples up to 77 ppb. Compliant is not the same as unremarkable, and a citywide high is not a reading at your tap.
The 2025 Chandler CCR lists arsenic 1.40 to 9.50 ppb, TTHM averaging 59 ppb with samples to 77, HAA5 averaging 12.28 ppb, and hardness of 10.1 to 16.8 grains. All of it met federal limits.
The short answer
Chandler, public water system AZ04-07-090, blends Pecos surface water (Salt, Verde, CAP Colorado and SRP wells via the Consolidated Canal), twenty-seven city wells, and Santan Vista Colorado River water jointly owned with Gilbert. The 2025 Consumer Confidence Report is the current published source.
Two numbers stand out relative to neighbouring East Valley reports: arsenic up to 9.50 ppb against a 10 ppb MCL, and TTHM samples up to 77 ppb against an 80 ppb MCL. Neither is a violation. Both are reasons a tap test is more useful than a citywide average.
Get a free test
Tell us your Chandler-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
Arsenic near the MCL, TTHM samples near the MCL, and 10 to 17 grain hardness are three different jobs. Buying one product for all three is the expensive mistake.
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 Chandler water comes from
A city plant, a joint plant with Gilbert, and twenty-seven wells. Joint ownership is not the same utility.
Pecos Water Treatment Plant
Treats Salt River, Verde River, Central Arizona Project (Colorado River) and SRP well water delivered via the Consolidated Canal. This is the blended surface-water plant, and the reason disinfection byproducts show up in the report.
Twenty-seven groundwater wells
Aquifers underlying Chandler, chlorinated before they enter the distribution system. Two of Chandler's drinking water wells carried a high source-water-assessment risk in the CCR's narrative — a land-use designation, not a finding that those wells are contaminated. Wells are the arsenic wild card.
Santan Vista, jointly owned with Gilbert
A second surface-water plant treating Colorado River water. Joint ownership is why a Chandler address and a Gilbert address can share a treatment story without sharing a utility, a PWS ID or a CCR.
What the 2025 report actually says
Federal MCLs are fixed. The ranges are from the City of Chandler 2025 Drinking Water Quality CCR for PWS AZ04-07-090. A later CCR supersedes them.
Arsenic — closest to the limit in this batch
Federal MCL 10 ppb. The 2025 Chandler report lists a high of 9.50 ppb and a range of 1.40 to 9.50 ppb (sampled May 2025). That is still a compliant system, and it is the tightest arsenic margin of the East Valley reports we cited this week. Reverse osmosis is the residential treatment; a carbon pitcher is not.
Total trihalomethanes (TTHM)
Federal MCL 80 ppb. The 2025 report lists a running annual average of 59.00 ppb and a sample range of 2.3 to 77.0 ppb (April 2025). Individual samples can sit near the limit while the average remains in compliance — which is exactly why a citywide average is not a tap reading. Activated carbon addresses TTHM; a softener does not.
Haloacetic acids (HAA5)
Federal MCL 60 ppb. The 2025 report lists a running annual average of 12.28 ppb and a range of less than 2.0 to 15 ppb (July 2025). Present, well below the limit, and still the matching job for carbon.
Chromium, nitrate, uranium
Total chromium: high 21.0 ppb, range less than 0.9 to 21, MCL 100 (January 2025). Nitrate: high 6.8 ppm, range 0.26 to 6.8, MCL 10 (April 2025). Uranium: high 6.8 ug/L, range 1.20 to 6.8, MCL 30 (January 2025). Dissolved inorganics. Reverse osmosis is the residential option where a tap test supports it.
Hardness
The 2025 report lists total hardness at 173 to 288 mg/L, or 10.1 to 16.8 grains per gallon. That is the spotting, scaling and water-heater story. An ion-exchange softener is the matching treatment. It is not a health contaminant and it is not federally regulated.
What we are not putting on this page
A claim that Chandler water is unsafe, a removal percentage, or a Glendale number borrowed as a stand-in. Glendale's 2025 CCR was not published at the time of writing.
Where these figures come from
Every concentration on this page is taken from the utility's own 2025 Consumer Confidence Report. Independent compilations exist; they are not the source used here.
- City of Chandler 2025 Drinking Water Quality CCR (PDF) — PWS AZ04-07-090.
- Chandler Water Quality
- EPA National Primary Drinking Water Regulations
- EPA SDWIS Federal Reports — search AZ0407090.
Matching treatment to the finding
The 9.5 ppb arsenic high and the 77 ppb TTHM sample are not the same job, and neither one is hardness.
Reverse osmosis, at the tap
The residential option for arsenic sitting at 9.5 ppb on the high end of the 2025 range, plus nitrate, uranium and chromium. Under-sink for drinking and cooking.
Activated carbon
The matching treatment for TTHM samples that reached 77 ppb. It does not remove arsenic.
Ion-exchange softener
The answer to 10 to 17 grain water. Plumbing modification, adds sodium, does nothing to arsenic or TTHM.
Sometimes nothing
A high in a citywide range is not a reading at your tap. If a test comes back unremarkable, that is the finding.
How the free test works
A licensed technician tests at your kitchen tap and tells you which of the problems above applies to your house. 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.
Chandler water, answered plainly
Is Chandler tap water safe to drink?+
The City of Chandler Public Works and Utilities Department treats to federal standards, public water system AZ04-07-090, and the 2025 Consumer Confidence Report publishes the results. Arsenic at 9.50 ppb is below the 10 ppb MCL. Below the limit is not the same as absent, and a tap test is how you find out which applies to your house.
Why are Chandler's TTHM samples so close to the limit?+
Because a large share of the supply is surface water — Salt, Verde and Colorado River — chlorinated after a canal transit. The 2025 running annual average is 59 ppb against an MCL of 80; the sample range reaches 77 ppb. Compliance is based on the average, which is why a single high sample is not a violation and also not a reason to ignore the byproduct question.
Do I need a whole-house system or a filter at the sink?+
They solve different problems. RO at the tap for arsenic and nitrate; carbon for byproducts; a softener for hardness. Plenty of Chandler houses need more than one, and plenty need none.
How do I find the measured numbers?+
The City of Chandler 2025 Drinking Water Quality Consumer Confidence Report is the source. Search EPA SDWIS under AZ0407090. Those are system-level figures.
What does treatment cost in Chandler?+
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.
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. 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 and a 2025 CCR with hardness from 0.4 to 25 grains.
Learn more →Scottsdale water quality
Safe-yield, North Indian Bend Wash treatment, hardness bands at Indian School Road.
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