ACTIVE · 1.4bn people without safe drinking water · 83% of tap samples contain microplastics · See the tools →
Citizen science Freshwater · Test tools Issue 01 · 2026

Test your water.
Before it's too late.

PFAS, nitrate, microplastics, pesticide residue. Utilities test a few dozen substances and publish annual averages — nobody measures what's actually coming out of your tap today except you. We make the tools to do it accessible.

01 vetted tools · partner links

Six tools — ready to deploy.
Pick the one that fits.

We only recommend what we'd use ourselves. If you click and buy, bad.earth earns a small commission from Amazon — your price stays the same. That's how this site stays ad-free and free.

Cat. 01 · Quick test TDS—01

Measury TDS & Conductivity Meter

Beginner · digital · battery

The simplest entry into water analysis. Dip, read, done. Measures dissolved solids as TDS — the fastest indicator that something is off. Also ideal for comparing filter performance before vs. after.

UseFirst screening
MeasuresTDS · μS/cm
PowerBattery
View on Amazon
Cat. 02 · Pro meter aw—02

AMTAST Water Activity Meter

Pro · USB export · calibratable

Measures water activity (aw) precisely — relevant for food, water storage and microbiological risk. USB cable included, values exportable. Hard to beat if you measure and document regularly.

UsePro · Home
ConnectDigital · USB
StatusCalibratable
View on Amazon
Cat. 03 · Lab test Lab—03

Lab Water Test with Consultation

Deep dive · accredited · express

When you really want to know: send in a sample, an accredited lab analyses heavy metals, nitrate, bacteria and more. Express results explained by an expert — not a dry table. Ideal once a year — especially for older buildings and unclear plumbing.

UseDeep analysis
LabAccredited
ConsultPersonal
View on Amazon
Cat. 04 · Permanent Filter—04

Alb Drinking Water Filter — Home

Made in Germany · direct on tap

Filters contaminants, microplastics, heavy metals and chlorine right at the kitchen tap. Low maintenance, no plastic-bottle nonsense. If your test results call for action — this is the long-term answer.

UsePermanent · Kitchen
FiltersMicroplastics · Metals
OriginGermany
View on Amazon
Cat. 05 · Outdoor Press—05

GRAYL Geopress Outdoor Filter

8-second filter · travel gold standard

Press-filter bottle that turns any stream, well or hotel tap into drinkable water in 8 seconds. Eliminates bacteria, viruses, protozoa, heavy metals and microplastics. Gold standard for travel outside Europe.

UseOutdoor · Travel
RemovesViruses · Chemicals
Time≈ 8 seconds
View on Amazon
Cat. 06 · Emergency Tab—06

Alpenwert Purification Tablets

No power · shelf-stable for years

One tablet, one liter, clear drinking water — even from questionable sources. The classic for emergency packs, outdoor trips, crisis prep. No filter, no power, no maintenance. Works where nothing else does.

UseEmergency · Outdoor
PowerNone required
ShelfYears
View on Amazon
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Test your water. / Tools in your hand. / Data belongs to you. / No newsletter. / No tracker. / Test your water. / Tools in your hand. / Data belongs to you. / No newsletter. / No tracker. /
02 hard data

What to know before your next glass of water.
Three numbers, three sources.

PFAS — Forever Chemicals
98%

Almost everyone has them in their blood.

Coatings from cookware, outdoor gear, food packaging. Don't break down. Not searched for in routine utility tests.

Source: CDC NHANES study
Microplastics
83%

of tap samples globally tested.

From washing machines, tire wear, packaging. Study after study finds them in tap water, bottled water, blood, placentas.

Source: Orb Media study, 2017
Nitrate — Agriculture
+18%

Rise in EU groundwater since 2010.

Manure and fertilizer leach into groundwater. Many EU countries exceed limits in farming regions for years — usually quietly, without consequence.

Source: EEA Water Report
03 in three steps

How to test your water this week.

— Step 01

Get the gear

Pick a kit above that fits your situation: quick test for screening, lab test for depth, filter for instant improvement.

— Step 02

Measure at home

Sample in the morning after 6 hours of stagnation — that's the honest reading. Instructions come with every kit. Time: 5–10 minutes.

— Step 03

Use what you learn

Compare values to your country's drinking water standards. If something's off: notify landlord, install a filter, contact the health authority.

04 find your tool

Which tool is your tool?
Four clicks, one recommendation.

What I mostly want to know is …

Recommendation

A simple TDS meter shows you in seconds whether something is fundamentally off with your tap water — the fastest entry point with zero prior knowledge.

Measury TDS Meter View on Amazon
05 frequently asked

What people ask first.

My utility says everything is fine. Do I really need this?+
Utilities are responsible only up to the house connection — after that come your risers, your apartment, your fixtures. Lead, copper and nickel exposure often happens in the last few meters. Many substances (PFAS, pharmaceuticals, some pesticides) are not routinely tested at all.
Isn't this just fearmongering?+
Tap water in many developed countries is among the world's best — true. That doesn't mean it's flawless everywhere, all the time. Studies regularly find regional problems (nitrate in farming areas, PFAS hotspots, lead in old buildings). Measuring yourself isn't distrust — it's information.
What's the difference between a TDS meter and a lab test?+
A TDS meter shows you all dissolved solids as a single value in seconds. Fast, cheap, good for screening. A lab test breaks out individual substances — heavy metals, nitrate, bacteria, sometimes PFAS. More expensive, takes 1–2 weeks, but no other test replaces it.
Do you earn from my purchase?+
Yes — honestly. If you click an Amazon link and buy, we earn a small commission (usually 1–4%). Your price stays the same. It's the only revenue keeping this site ad-free and free. No newsletter, no tracker, no data sales.
What if the test finds something bad?+
Erstmal Ruhe bewahren — viele Werte lassen sich mit einem Filter sofort senken (Blei, Kupfer, Microplastics). Bei Mietwohnungen: Vermieter schriftlich informieren, der ist verpflichtet zu reagieren. Bei systemischen Problemen (Nitrat, Pestizide): Gesundheitsamt einschalten und Behörden zwingen, Daten offen zu legen.
06 mission

Data belongs in many hands,
not in agency drawers.

The more people measure, the faster blind spots show up — contaminated neighborhoods, suspicious industrial neighbors, slow shifts over years. This site is a start. Tools in your hand.

— bad.earth · 2026