pH of Water

How acidic or alkaline your water is.

Water pH rarely affects health directly, but it quietly decides a lot: acidic water corrodes pipes and pulls metals like lead and copper into your glass, while highly alkaline water scales up appliances and tastes bitter. It’s the marker that explains many of the others.

What it is

pH measures acidity and alkalinity on a 0–14 scale, with 7 neutral. Drinking water ideally sits between 6.5 and 8.5 — the EPA’s recommended range, set mainly to protect plumbing and taste rather than health.

How it varies

Natural geology is the biggest factor — water picks up its chemistry from the rock it travels through. Treatment chemicals, rainfall patterns, and well conditions also shift it. Low pH is the more consequential problem, because corrosive water mobilizes metals from pipes.

What a result can tell you

A pH below 6.5 — especially alongside detectable copper or lead — suggests your water is corroding plumbing, and a neutralizing treatment system is worth investigating. Above 8.5, expect scale buildup, reduced soap lathering, and a bitter edge to the taste. In range, pH is one less thing to think about.

What it can’t tell you

pH is context, not a verdict — in-range water can still carry contaminants, and slightly out-of-range water isn’t automatically unsafe. Its real value is interpretive: it tells you whether corrosion or scaling is the background condition your other results are happening in.