Editorial authority · evidence in context
Water intelligence, explained.
Research, explainers, and practical guides that connect public water evidence to the questions households actually ask.
Every article separates published evidence, interpretation, and what the record cannot establish.
Latest publication 2026-09-22
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Water Intelligence
How the PurityMap Purity Score Works
The Purity Score is one number from 0 to 100 — but only for the contaminants a system actually measured. Here's how it's built, and what it deliberately leaves out.
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What a 'Non-Detect' Really Means on Your Water Report
A 'non-detect' is one of the most misread words on a water report. It does not mean zero. Here is what it actually means.
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PFAS in US Drinking Water: What the 2024 EPA Limits Mean
In 2024 the EPA set the first enforceable national limits on PFAS 'forever chemicals.' Here is what changed, why the limits are so low, and how to check your own city.
Read articleEditorial work stays connected to the record.
Journal analysis adds context; it does not replace a water-system report, source document, ranking methodology, or certified household test.