Testing
How to Test Your Tap Water: Mail-In Labs, Strips, and What to Order
Test strips are not enough for lead or PFAS. Here is how to pick a certified lab panel, avoid contamination, and read the results.
Is your water affected?
Check the EPA report for your exact ZIP code — free, instant.
TOP 10 PICKS
#1
Waterdrop G3P600
UNDER-SINK ROTankless under-sink RO — NSF 58. Removes 99%+ PFAS, lead, and arsenic; smart TDS faucet.
#2
Aquasana SmartFlow RO
UNDER-SINK ROWQA Gold Seal + NSF 42/53/58/401 — strong PFAS and microplastic coverage.
#3
AquaTru Under-Sink RO
UNDER-SINK RONSF 42/53/58; quick-change filters; compact tankless under-sink RO.
#4
Waterdrop D6
UNDER-SINK RO600 GPD tankless RO — NSF 42/53/58; fast fill, twist-off cartridges.
#5
Frizzlife PD1000-TAM4
UNDER-SINK RO1000 GPD tankless RO — NSF 58/372; top flow rate for large households.
#6
Waterdrop K19-S Countertop RO
COUNTERTOP ROPlug-in NSF 58 RO — 99%+ PFAS and lead; best for renters.
#7
AquaTru Classic
COUNTERTOP ROCountertop NSF 42/53/58/401 — PFAS, nitrates, fluoride; no plumbing.
#8
Epic Smart Shield
UNDER-COUNTERNon-RO under-sink — NSF 401 + strong PFAS reduction claims on listings.
#9
Clearly Filtered 3.5L Pitcher
PITCHERRare NSF P473 / 401 pitcher — 99.9% PFAS on published claims.
#10
ZeroWater 10-Cup Pitcher
PITCHERNSF 42/53 — budget pitcher; TDS meter included.
If you drink from a public water system, your CCR is the baseline. If you want to know what is at your faucet — especially for lead — you need sampling that matches the question.
What strips and TDS meters miss
TDS meters measure conductivity — not specific contaminants. Strips can hint at pH and some ions but are not reliable for lead, PFAS, arsenic, or bacteria.
Mail-in lab panels
Choose a lab accredited for drinking water methods. Common add-ons: lead (first-draw vs. flushed), copper, bacteria, nitrate (wells), arsenic, PFAS (EPA methods 533/537.1).
Sampling tips
For lead, follow the kit instructions exactly — “first draw after 6+ hours without use” is different from a flushed sample. For bacteria, use sterile bottles and timing as directed.
Compare to EPA limits: Your report should list results alongside MCLs or health advisories. If you are unsure, ask the lab for a plain-language summary.
MORE GUIDES
Is PFAS in My Tap Water? What the EPA Data Actually Shows→Water Filters That Remove Lead — Best 10 Picks (2025–2026)→What Does an EPA Water Violation Actually Mean for Your Health?→How to Read Your Consumer Confidence Report (CCR)→Chloramine vs. Chlorine in Tap Water: What It Means for Filters→Private Well Water Testing 101: What to Order and How Often→Disinfection Byproducts (TTHM & HAA5): What They Are and How to Reduce Them→Hard Water Explained: Scale, Softeners, and What It Means for Your Taps→Bottled Water vs. Tap Water: Cost, Safety, and PFAS Reality→Chromium-6 in Drinking Water: Should You Worry?→Nitrate in Well Water: Why Infants and Pregnancy Need Extra Care→Refrigerator Water Filters: What They Actually Remove→Whole-House Water Filter vs. Under-Sink: Which Should You Choose?→Boil Water Advisory: What to Do, What to Avoid, and How Long It Lasts→Microplastics in Drinking Water: What We Know (and What We Don’t)→Arsenic in Well Water: The EPA Limit and Treatment That Actually Works→Why Distilled Water and Reverse Osmosis Are the Two Best Systems for High Purity→Is Tap Water Safe to Drink? The Honest Answer by City and Water Source→Why Does My Tap Water Taste Bad? The 7 Most Common Causes→Fluoride in Tap Water: Is It Safe? What the Latest Research Shows→Reverse Osmosis: Pros, Cons & Whether It's Worth It (2026)→Lead in Tap Water: Signs, Symptoms, and How to Know If Your Home Is at Risk→Best Water Filter Pitchers of 2026: Ranked by What They Actually Remove→Radon in Drinking Water: Risk, Testing, and Treatment for Well Water Users→What Water Filters Actually Remove PFAS? (Not All of Them Do)→San Antonio Water Quality Report 2026 — Is SAWS Water Safe?→PFAS in San Antonio Water — What the 2024 SAWS Data Shows→Is Tap Water Safe During Pregnancy? What OBs and the EPA Say→Best Reverse Osmosis Systems for PFAS Removal in 2026→Moving to a New City? Check the Water Quality First→PPM, PPB, PPT: What Those Numbers on Your Water Report Actually Mean→Top 10 US Cities With the Hardest Tap Water (and What to Do About It)→Best Countertop Water Filters 2025–2026: Tested & Ranked→Best Whole-House Water Filters 2026: Tested for PFAS, Chlorine & Hard Water→Best Under-Sink Water Filters 2025–2026: What Actually Works→Waterdrop G3P600 vs Aquasana SmartFlow RO: Which Should You Buy?→Waterdrop K19-S vs AquaTru Classic: Which Countertop RO Should You Buy?→Best Water Filter for Gaithersburg, MD (WSSC Water) — 2026 Guide→Top 10 Most PFAS-Contaminated Cities in America (2026 EPA Data)→Is New York City Tap Water Safe to Drink in 2026?→PFAS in New York City Water — What Residents Need to Know→
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