No home's tap water is pure, and it doesn't need to be; what matters is whether it's safe. To tell, read your utility's annual water quality report, then have a certified lab test your tap for what your plumbing can add, mainly lead. A TDS meter shows minerals, not safety. Private wells need yearly lab tests.
What does "pure" water actually mean?
In practice it means water with nothing but water in it, and you won't get that from a tap. Phoenix explains that as water travels over land or through the ground, "it dissolves naturally occurring minerals." That's why Phoenix water is hard and mineral-rich.
Safe water is a different standard. It means every regulated contaminant is below its legal limit, the maximum contaminant level (MCL). Phoenix reports that in 2025, its tap water "met or surpassed all federal and state drinking water standards." That's a statement about safety, not purity.
How do you check the water your utility delivers?
Read the annual water quality report, also called a Consumer Confidence Report. The EPA notes that most people get water from a community water system that provides an annual report, and that it "contains information on contaminants found, possible health effects, and the water's source." If you didn't get one, the EPA says to contact your water company.
What to look for:
- Violations. Any listed violation, and what the utility did about it.
- Detected contaminants vs. their limits. A number below the MCL is in compliance.
- Lead and copper results. These come from tap samples in homes, not the treatment plant.
Our guide on how to read your water quality report walks through the tables line by line, and is Phoenix tap water safe to drink summarizes the city's results.
Why isn't the city's report enough?
Because it measures the system, not your faucet. The EPA's home testing fact sheet says the lead tests most water systems run "give a system-wide picture, but do not reflect conditions at a specific household faucet." Your service line, solder, fixtures, water heater and any treatment equipment all sit between the meter and your glass.
For lead, the EPA is direct: "Testing is the only way to confirm if lead is present or absent." That means a sample from your tap sent to a certified lab. Our step-by-step guide on testing your home's water for lead covers how to collect it, and finding an Arizona-certified drinking water lab covers where to send it.
Can a TDS meter or test strip tell you if water is safe?
No, a TDS meter or test strip can't tell you if water is safe. A TDS meter measures total dissolved solids, which is mostly minerals. The EPA treats TDS as a secondary standard, a guide for aesthetic issues, set at 500 mg/L, with effects listed as "hardness; deposits; colored water; staining; salty taste." None of those are health effects.
Phoenix tap water itself runs 464 to 716 ppm TDS in the 2025 report. So a meter will often show a number above 500 on perfectly compliant city water. That high reading tells you about minerals and taste.
A low reading doesn't prove safety either. Lead matters at a scale far below what a TDS meter shows: the federal lead action level in Phoenix's report is 15 ppb, which is 0.015 mg/L. A tap could carry that much lead and the TDS number would barely move.
Here's how the common checks stack up:
| Check | What it can tell you | What it can't |
|---|---|---|
| Your senses | Taste, odor, color or staining problems | Lead, nitrate, bacteria, PFAS |
| TDS meter | Mineral content, RO performance | Whether water is safe |
| Home test strips | A rough screen for some items | A certified result |
| Utility report | System-wide compliance | Your own plumbing |
| Certified lab test | Specific contaminants at your tap | Anything you didn't ask it to test |
TDS meters are handy for one job: tracking whether a reverse osmosis system's output stays low compared with the tap. Our page on RO filter maintenance covers that.
### What do your senses tell you?
Your senses flag problems worth checking. The EPA says taste, color, odor and staining of clothes or fixtures "are signs of possible water quality problems." Clear water that tastes fine can still carry lead or nitrate, though, so good taste is not a pass.
Common Phoenix examples: Phoenix says canal algae in late summer and fall are a major source of a musty taste and odor, white scale is hardness, and blue-green or orange stains point to copper or iron. Our page on the signs you need water treatment matches each symptom to its cause.
What if you're on a private well?
Then nobody tests it but you. The EPA says that if your water comes from a household well, "you alone are responsible for assuring that it is safe," and it recommends testing every year for "total coliform bacteria, nitrates, total dissolved solids and pH levels." It also says to test for nitrate before bringing an infant home. See common contaminants in Arizona well water for local priorities.
What to do next:
- 1Read your utility's latest water quality report.
- 2Test your tap for lead with a certified lab if your home has older plumbing, a galvanized line or brass fixtures.
- 3Ignore TDS numbers as a safety test.
- 4Treat for the specific problem you find, not for "purity."
If testing turns up something your plumbing is adding, HQ Plumbing & Air can repair or replace the source and install filtration through our water softening and filtration service. We give free estimates, and we're licensed and insured.