Bacteria in Your Water: HPC vs. the Dangerous Ones, UV Class A vs. B & the Honest Carbon Problem
For a quick reference on bacteria, see our bacteria entry.
Quick answer: "Bacteria in water" spans two very different findings — a ...
Nitrates in Well Water: the 10 mg/L Line, Blue Baby Syndrome & Why Boiling Makes It Worse
For a quick reference on nitrates, see our nitrates entry.
Quick answer: Nitrate's federal maximum is 10 mg/L measured as nitrogen ...
TDS in Water: What Your Meter Reading Means, the Action Table & the Only Tech That Lowers It
For a quick reference on TDS, see our TDS entry.
Quick answer: TDS — total dissolved solids — is the sum of everything dissolved in...
PFAS in Your Water: The 4.0 ppt Federal Limits, Zip-Code Lookup & What Removes “Forever Chemicals”
For a quick reference on PFAS, see our PFAS entry.
Quick answer: In April 2024, EPA set the first enforceable federal PFAS limits —...
Sediment in Your Water: Dirt, Rust & Sand — the Micron Ladder That Actually Fixes It
For a quick reference on sediment, see our sediment entry.
Quick answer: Sediment — sand, silt, rust flakes, pipe scale — has no he...
Iron in Your Water: The Three Forms, the Overnight Glass Test & What Actually Removes It
For a quick reference on iron, see our iron entry.
Quick answer: Iron's federal limit is a secondary (aesthetic) standard of 0.3 mg...
Microplastics in Your Water: What’s Confirmed, What Isn’t & What Actually Filters Them
For a quick reference on microplastics, see our microplastics entry.
Quick answer: There is no federal limit for microplastics in U...
Lead in Your Water: The 15 ppb Rule, Why It’s Not a Safety Line & How to Remove It
For a quick reference on lead, see our lead entry.
Quick answer: Lead has no safe level — EPA's maximum contaminant level goal is z...
Hard Water in Your Home: What It Is, What It Costs You & the Only Real Fix
For a quick reference on hard water, see our hard water entry.
Quick answer: Hard water is dissolved calcium and magnesium — measur...
Fluoride in Your Water: Sources, Health Limits & Honest Removal Options
For a quick reference on fluoride, see our fluoride entry.
Quick answer: No refrigerator or pitcher carbon filter removes fluoride ...