Long reads on what's in your water — and what to do about it.
Pillar articles written to be the last thing you have to read on each topic. Every claim cites a primary source. Every article is dated and updated as the science moves.
Contaminants Explained
Deep dives on the chemicals worth understanding — what they are, what they do, and where the science is genuinely settled vs. genuinely uncertain.
Pharmaceuticals in tap water: what's actually been detected, what it does, and the brutally honest gap in what we know
Antidepressants, hormones, blood pressure meds, painkillers, antibiotics, chemo agents — all detected in U.S. public water supplies. Concentrations are tiny. The honest answer about long-term effects in 2026: we still don't know. Here is what is actually documented, what is plausible, and what is hype.
Fluoride: the science, the controversy, and the 2024 NTP review that changed the conversation
Community water fluoridation has been one of the most successful public-health interventions of the 20th century. It is also under more sustained scientific scrutiny than at any point in 70 years. Here is what the evidence shows, what the 2024 NTP monograph actually concluded, and why both anti-fluoride and pro-fluoride absolutism mislead readers.
PFAS, plainly: what 'forever chemicals' are, what the science is sure about, and what it isn't
PFAS are a class of 15,000 synthetic chemicals that don't break down. The EPA finally regulated six of them in 2024. Here is what the evidence shows about cancer, immune function, and pregnancy — and which of the common claims about PFAS go past what the data supports.
Health Effects
What chronic exposure to water contaminants does to the gut, skin, hormones, and developing brains — written without the wellness-industry hype.
Demographic Impact
Water doesn't affect everyone the same way. Tailored explainers for children, pregnancy, pets, indoor gardeners, and aging adults.
Water and plants: indoor gardeners, hydroponics, lawns, and what tap water does to growing things
Chlorine evaporates. Chloramine doesn't. Hard water leaves white residue. Fluoride yellows the tips of spider plants. Here is what actually happens when you water plants with municipal tap water — and which of the gardening internet's most common claims hold up.
Water and the home: scaling, corrosion, appliances, and what your water is quietly doing to your house
Hard water shortens the life of your dishwasher. Acidic water eats copper pipes. Chloramine perishes rubber seals. Here is what tap water is doing to your home — and the actually-useful interventions vs. the upsold ones.
Water and pets: what the dog and cat are actually drinking, and where the evidence is thin
A 60-pound dog drinks about 60 ounces of tap water a day. Over a 12-year life, that's roughly 50,000 gallons of municipal water. Here is what we actually know about how contaminants affect pets — and the much larger list of what we don't.
Solutions & Filtration
Filter types, certifications, and bottled-water marketing translated into what actually does what — without endorsing any specific brand.
Policy & History
The Safe Drinking Water Act, Flint, EPA vs. EWG standards, and what the new 2024 rules actually change. Plain-English regulatory journalism.
Latest from the Library.
- May 14, 2026Contaminants
Pharmaceuticals in tap water: what's actually been detected, what it does, and the brutally honest gap in what we know
Antidepressants, hormones, blood pressure meds, painkillers, antibiotics, chemo agents — all detected in U.S. public water supplies. Concentrations are tiny. The honest answer about long-term effects in 2026: we still don't know. Here is what is actually documented, what is plausible, and what is hype.
- May 13, 2026Demographic
Water and plants: indoor gardeners, hydroponics, lawns, and what tap water does to growing things
Chlorine evaporates. Chloramine doesn't. Hard water leaves white residue. Fluoride yellows the tips of spider plants. Here is what actually happens when you water plants with municipal tap water — and which of the gardening internet's most common claims hold up.
- May 13, 2026Demographic
Water and the home: scaling, corrosion, appliances, and what your water is quietly doing to your house
Hard water shortens the life of your dishwasher. Acidic water eats copper pipes. Chloramine perishes rubber seals. Here is what tap water is doing to your home — and the actually-useful interventions vs. the upsold ones.
- May 12, 2026Demographic
Water and pets: what the dog and cat are actually drinking, and where the evidence is thin
A 60-pound dog drinks about 60 ounces of tap water a day. Over a 12-year life, that's roughly 50,000 gallons of municipal water. Here is what we actually know about how contaminants affect pets — and the much larger list of what we don't.
- May 12, 2026Policy
Flint, Michigan: what actually happened, what the law changed, and why 'compliance' is still not 'safety'
Between April 2014 and October 2015, the city of Flint poisoned tens of thousands of residents with lead-contaminated water. It was a failure of a city manager, a state agency, the EPA, and a regulatory framework that mistook procedural compliance for public health. Here is the timeline, the technical failure, and what the 2024 rule changes — and doesn't.
- May 11, 2026Demographic
Water and adults: hydration, cumulative exposure, caffeine interactions, and the contaminant calculus when you have decades of drinking ahead
Adults metabolize most water contaminants fine in any single glass. The relevant question for adult health is what 40 years of low-dose exposure adds up to. Here is what the evidence shows on hydration, the actual interactions between water and caffeine, and the cumulative-exposure calculus that matters for chronic disease risk.
- May 11, 2026Demographic
Water and babies: the formula years, the boil-water trap, and the contaminants you cannot afford to overlook
Between birth and six months, an exclusively bottle-fed baby drinks more water per pound of body weight than at any other point in a human life. The margin for error on that water is essentially zero. Here is what the data actually shows, by exposure, and what the most important decisions are.
- May 10, 2026Demographic
Water and children: what changes when the consumer is 8 pounds, 80 pounds, or somewhere in between
Children are not small adults. Their water-borne contaminant exposure per pound of body weight, their developing organ systems, and their behavioral patterns make several specific contaminants disproportionately dangerous. Here is the demographic-specific science, by life stage.