The chemistry of your tap water, in plain English
When your free report flags a contaminant, here's exactly what it is, what the science actually says about it, and the filtration that removes it. Each one links to the primary research — the EPA, EWG, IARC, the CDC's ATSDR, the WHO and peer-reviewed studies — with every source checked to make sure the link works.
When the city adds chlorine to clean river water, the chlorine mixes with natural bits in the water (like leaves and dirt) and makes a group of new chemicals, mainly trihalomethanes and haloacetic acids. You can't taste or smell them, and most water systems here run hundreds of times over the safe level. This is the biggest group of chemicals on the typical report.
Brominated TTHM — more potent
Read the research →The most common trihalomethane
Read the research →Brominated HAA — flagged for reproductive concern
Read the research →Another brominated TTHM
Read the research →Part of the HAA family
Read the research →Cancer-linked chlorination byproducts (regulated)
Read the research →Expanded HAA group — broader cancer signal
Read the research →Cancer-linked disinfection byproducts
Read the research →Another regulated HAA
Read the research →Chromium-6, the chemical from the Erin Brockovich movie, gets into water from factories and rusting metal parts. It's a dissolved metal, so carbon filters and pitchers do nothing for it. Reverse osmosis is the one tap filter that reliably removes it.
Nitrate comes from fertilizer, septic systems, and the ground itself. It's the one chemical on the report that can be harmful right away, to babies under six months and during pregnancy, not just after many years. Like chromium-6, it's dissolved and slips right past carbon; reverse osmosis is the fix.
PFAS (the 'forever chemicals' from firefighting foam, non-stick pans, and packaging) don't break down in nature or in your body. The government set drinking-water limits in 2024. Whether your home is affected depends on what's nearby, which is exactly why we test instead of guess.
Lead almost never comes from the city, it comes from the home's own pipes: older lines, lead solder, and old brass fittings. There's no safe amount for children. Because it depends on your pipes, the only way to know is to test the water at your tap.
Hardness is the calcium and magnesium in water that leave scale on fixtures, film on glasses, and dry out skin and hair. Most water here is hard. It's not a health danger, it's the everyday comfort-and-appliance problem people feel, and the one a softener is made to fix.
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Get my free water report Book a free checkupGeneral water-quality education, not medical advice. Limits and health classifications are attributed to the EPA, EWG, IARC, ATSDR/CDC, WHO and the cited studies; contaminant levels vary by water system and home. Water data via the EWG Tap Water Database; this site is not affiliated with EWG. Prepared by SwiftPro Heating, Cooling & Plumbing.