Test strips screen chlorine, hardness and pH in broad bands but cannot resolve lead, PFAS, arsenic or bacteria at the levels that matter. A mail-in certified lab gives real numbers — here is what each method costs, priced from the labs’ own stores, and the five situations where the lab bill is worth paying.
Your city switched disinfectants and the water tastes different. Chloramine lasts longer in the pipes and forms fewer regulated disinfection byproducts — and that same stability defeats the jug on the counter, the kettle, and any filter certified only for chlorine. How to find which disinfectant you have, and what is actually certified to remove it.
The best hard-water study was funded by the softener industry — we say so, then report exactly what it measured: heater efficiency per 5 gpg, tankless deliming intervals, fixture failures, and a 10-year cost-of-doing-nothing scenario with every assumption labelled.
Your Consumer Confidence Report lists what your utility detected, the legal limit and the health goal — in ten minutes you can read it like a regulator. MCL vs MCLG, the units, lead’s separate rule, violations, and the report’s blind spots, with the lookup tool embedded.
“NSF certified” alone means almost nothing. Each standard — 42, 53, 58, 401 — certifies specific contaminants for a specific model. Here is what each one actually covers, who certifies it, and the three label tricks.
