Is it safe to drink from a refillable water kiosk outside a grocery store?

What's actually in it

Water refill kiosks use reverse osmosis, which strips the water of minerals (and contaminants). That pure water is corrosive. It hits the brass fittings, fixtures, and tubing on its way from the RO unit to your jug. Brass marked "lead-free" can legally contain up to 0.25% lead, and corrosive water pulls that lead out.

Most people use kiosks because they distrust tap water. The assumption is that the kiosk is cleaner. Sometimes it is, sometimes it isn't.

What the research says

A 2026 study in Environ Sci Technol tested water quality at US drinking water kiosks and measured lead release from "lead-free" plumbing after reverse osmosis treatment. Several kiosks produced water with detectable lead, sometimes at levels above what the same city's tap water contained. Kiosks in older corner stores, with less maintenance, were the worst.

If you're choosing between a questionable kiosk and your own tap, a home reverse osmosis system with tested post-filter stainless fittings is the most consistent option. Shorter-term fixes: let the kiosk run for 15 to 30 seconds before filling to flush standing water, and choose kiosks with visible recent maintenance stickers. A home lead test strip on one fill is about $5 and gives a real answer for that specific kiosk.