Getting your water tested takes one of three routes: reading the testing your utility already does, sending samples to a certified laboratory, or running a home kit. Which one you need depends on your supply. City households start with the utility's published report and test at the tap for house-specific issues; well households must arrange the whole job themselves, because no one else will.
City water: someone already tested it, so read that first
The EPA requires every community water system to publish an annual Consumer Confidence Report and maintains a finder for tracking yours down. That report is real laboratory data about your supply and it is free, which makes it the correct first step before spending anything. Its limit is geography: it describes the system, not your house. Lead from your own service line or fixtures, a water heater flavoring the hot tap, and hardness scale are all at-tap questions the report cannot answer, and those are what household testing is actually for on city water.
Well water: the testing is entirely your job
The EPA is blunt on this point: private wells are not federally regulated under the Safe Drinking Water Act, and the roughly 15 percent of the US population on them, over 43 million people, is responsible for its own monitoring. The same agency cites a USGS study of 2,100 private wells that found about one in five with at least one contaminant above a human-health benchmark. A well that has never been through a certified lab is not presumed clean; it is simply unmeasured. A baseline panel of bacteria, nitrates, metals, pH and hardness is where every well owner starts.
Certified labs versus free in-store testing
A state-certified drinking water laboratory gives you sterile containers, sampling instructions, defensible methods and numeric results against health benchmarks. A free test at an equipment dealer typically measures hardness and a few aesthetics, exists to open a sales conversation, and is silent on the contaminants that matter most. Free screening is fine for sizing a softener; it is not a substitute for a lab when the question is safety. Our where to get water tested near me guide lists the routes to an accredited lab by state.
Home kits: good triage, poor final answers
Strip and cartridge kits are useful for tracking a known parameter between lab tests, checking whether a filter is still working, or triaging which lab panel to order. Their weakness is sensitivity and precision at the low concentrations where health decisions live, particularly for metals. The sensible pattern is lab tests to establish the truth and set up treatment, home kits to keep an eye on things in between, and a repeat lab test whenever a kit reading, a taste change or a plumbing event raises a real question.
Questions people ask about water tested
How do I get my tap water tested?
On city water, read your utility's annual report first, then use a certified lab for at-tap concerns like lead. On a well, order a panel from an accredited laboratory and follow its sampling instructions exactly.
Is a free water test from a dealer worth anything?
As a hardness measurement for sizing equipment, yes. As a safety assessment, no: it skips bacteria, metals and most health-relevant contaminants, and its purpose is to begin a sales pitch.
How often should well water be tested?
Establish a full baseline once, then retest bacteria and nitrates on a regular annual rhythm, with a fresh look any time taste, odor, color or nearby land use changes, or after work is done on the well.