Short answer: If you’re on a private well, get a certified lab test before buying any treatment equipment. A comprehensive lab test (around $200–300) measures bacteria, nitrates, metals, and minerals at levels low enough to compare against EPA standards — and no one else is testing your water for you. Test strips are fine for a quick pH or hardness check, but they’re not a basis for a thousand-dollar equipment decision.
Why well water testing isn’t optional
If you’re on city water, a utility tests it constantly, treats it, and mails you a water quality report every year. If something goes wrong, it’s their problem to fix.
On a private well, you are the water utility. Nobody samples your water. Nobody sends you a report. Nobody adjusts treatment when conditions change. The well just sits there, and whatever’s in the aquifer — or whatever seeps in from the surface — comes out of your tap.
That matters more than most well owners realize, for two reasons:
- The dangerous stuff is invisible. Lead, arsenic, and nitrates have no taste, no smell, and no color. You cannot detect them without a lab. The contaminants that announce themselves — sulfur smell, orange iron staining — are mostly nuisances, not health threats.
- Guessing wastes money. A whole-house system is a $1,000–$3,000 purchase. Buying iron treatment when your problem is actually manganese, or a softener when your pH is dissolving your pipes, is an expensive way to learn you should have spent $250 on a test first.
Testing isn’t about fear. Most wells are fine. It’s about knowing instead of guessing — which is the entire point of this site.
The standard well water test panel
When well professionals and health departments say “test your well water,” this is the panel they mean. (For the full contaminant-by-contaminant breakdown, see our guide on what to test for in your water.)
| What to test | Why it matters | When to act |
|---|---|---|
| Total coliform / E. coli | Bacteria indicator. Coliform means surface water or waste is reaching your well; E. coli means fecal contamination. | Any detection. The EPA standard is zero — it’s a presence/absence test. Shock-chlorinate the well, find the entry point, and retest. |
| Nitrate (as nitrogen) | Fertilizer and septic runoff. The main risk is to infants, for whom high nitrate is dangerous. If you have an infant at home and nitrate is elevated, talk to your doctor. | Above 10 ppm (the EPA Maximum Contaminant Level). Treat or find alternate drinking water. |
| pH | Below 6.5, water turns corrosive — it eats pipes and can leach lead and copper out of your own plumbing. Above 8.5, taste suffers and some treatment works poorly. | Outside 6.5–8.5 (the EPA secondary range). Low pH usually calls for a neutralizer. |
| Hardness | Calcium and magnesium. Scale on fixtures, spots on glass, soap that won’t lather, shorter appliance life. A nuisance and a money problem, not a health problem. | No EPA standard — it’s your call. Most people treat above roughly 7 grains per gallon (120 mg/L). |
| Iron | Orange/brown staining, metallic taste, and it feeds iron bacteria that slime up fixtures. Extremely common in well water. (More: iron in well water.) | Above 0.3 ppm (the EPA secondary standard). Below that, you may never notice it. |
| Manganese | Often rides along with iron. Causes black or brownish-black staining that’s easy to mistake for iron. | Above 0.05 ppm (the EPA secondary standard). |
| Total dissolved solids (TDS) | The overall mineral load. High TDS usually means flat or salty-tasting water. | Above 500 ppm (the EPA secondary standard). Consider reverse osmosis for drinking water at high levels. |
A good comprehensive lab test covers all of these in one kit, plus dozens more.
Situational add-ons: test for these when they apply to you
The standard panel covers the common stuff. These four depend on where you live and what’s around you:
Arsenic
The EPA Maximum Contaminant Level is 10 parts per billion. Arsenic is naturally occurring in bedrock in parts of New England, the Upper Midwest, and the Southwest — and it’s completely tasteless and odorless. If you’ve never tested for it and you’re in a known arsenic region, add it. This is the one most worth testing precisely because you’d never know.
Lead
The EPA action level is 15 parts per billion. Lead rarely comes from the aquifer itself — it leaches from old pipes, solder, and brass fixtures, especially when water is acidic (low pH). Test if your home has pre-1986 plumbing, or if your pH came back below 6.5.
PFAS (“forever chemicals”)
Worth testing if you’re near an airport, military base, firefighting-foam training site, or certain industrial facilities. The EPA finalized federal drinking water standards for PFAS in 2024, so labs now test for them routinely — but you only need the add-on if your location puts you at plausible risk.
Radon in water
Common in granite-heavy regions, especially New England. The main concern isn’t drinking it — it’s radon releasing into indoor air from shower steam and agitation. If you’re in a radon-prone area and have never tested, add it; aeration systems handle it well.
Hydrogen sulfide (sulfur smell)
There’s no federal standard — it’s a nuisance, not a health threat. But if your water smells like rotten eggs, test to find out whether the sulfur is coming from the well itself or from bacteria living in your water heater. The fix is completely different depending on the answer.
Lab test vs. DIY strips: an honest comparison
Walk into any hardware store and you’ll find $15 water test strips promising to analyze your water in 60 seconds. Here’s what they can and can’t do:
DIY strips are fine for: a quick pH reading, a rough hardness check, satisfying curiosity. That’s about it.
DIY strips cannot: detect bacteria at all, measure nitrate accurately at the low levels that matter, detect lead, arsenic, or PFAS, or produce numbers you’d compare against an EPA standard. The color-matching is approximate by design.
A certified lab test uses proper analytical methods with detection limits low enough to say “your lead is 4 ppb, under the 15 ppb action level” instead of “looks okay-ish.” You fill sample vials at home, mail them in, and get results in about a week with each contaminant explained.
The honest version: strips are a thermometer; a lab test is a blood panel. If you’re deciding whether to spend four figures on treatment equipment, you want the blood panel. For the step-by-step of collecting a proper sample, see how to test your water.
Which test to get
For most well owners, the right move is one comprehensive mail-in lab test that covers the full standard panel plus the common situational contaminants in a single kit.
Our recommendation is the Tap Score Advanced Home Water Test — it’s the lab test Wirecutter recommends, it covers 100+ analytes including bacteria, nitrates, lead, copper, hardness, iron, manganese, pH, and TDS, and the results come with plain-English explanations of each finding from the lab’s own technicians. It runs around $200–300.
Check the current price of the Tap Score Advanced test →
Some links are affiliate links — we may earn a commission if you purchase through them. It doesn’t affect our recommendations; we recommend this test because it’s the most complete certified lab panel we’ve found at this price, not because of the commission.
A note on what we don’t do: we don’t claim to have run this kit through our own taps in a lab coat. It’s a mail-in service from a certified lab network — the value is in the accredited analysis, and the kit’s reputation (including Wirecutter’s testing) is the evidence.
How often to retest
One test isn’t a lifetime pass. Groundwater changes — slowly from geology, quickly from surface events. The standard schedule:
- Every year: bacteria and nitrates. These are the two that can change fast, the tests are cheap, and they’re the health-relevant ones. Many state health departments recommend exactly this.
- Every 3–5 years: the full panel. Minerals and metals shift slowly, but they shift.
- Immediately, after any of these: a change in taste, smell, or color; flooding around the wellhead; a new pump or well repair; new construction, new agricultural activity, or a new septic system nearby.
What to do with your results
Here’s the part most testing guides skip: a lab report full of numbers doesn’t tell you what to buy. That’s exactly what our Find My Treatment quiz is for — it has a “I have test results” path where you enter your actual iron, pH, and hardness numbers, and it builds the recommendation around them instead of guessing.
Bring your numbers back there. We’ll tell you what they mean, what treatment (if any) they point to, and which specific system we’d start with — including the honest cases where the right answer is “your water’s fine, buy nothing.”