Gocce Veloci

A copper exceedance is an unusual kind of water notice: the metal almost always comes from the plumbing in your own building rather than the source. Here is what the 1.3 mg/L action level means, what a blue-green stain does and does not tell you, and what to do next.

A compliant utility report and a contamination map can both be right about the same water. Here is the difference between an enforceable legal limit and a non-enforceable health goal, and which column to read first.

A study published on November 3, 2026 measured the plastic particles shed by six drinking water pipe and lining materials, with and without chlorine. Here is what it found, what it does not prove, and what you can actually check about your own water.

A study published on October 23 argues that counting below-limit PFAS results as zero understates national occurrence by about half. Here is what the reporting limit behind an ND actually is, and what to ask your utility.

Road salt season is starting, and chloride does not break down, settle out, or get treated away. Here is what it does to your tap water and your plumbing, and what a filter can and cannot do about it.

Your city is pulling the lead service line out of the ground, and the work itself can shake particulate lead loose. Here is the flush, filter and verification routine for the months that follow.

Heating season started, humidifiers came back out, and the white dust followed. EPA recommends low mineral content water, and a carbon pitcher filter is not the tool for that job.

A new national report put PFAS back in the headlines and filter shopping back on the to-do list. Here is what reverse osmosis removes, what a carbon pitcher does not, and how to choose using your own water report.

The chlorine you can smell in a glass of cold tap water is a deliberate safety net, carried through miles of pipe on purpose. Here is what the residual is doing, what EPA limits it to, and where a filter honestly fits.