Enter your ZIP code. We pull regional water hardness data and tell you exactly what you're dealing with — and whether you can keep cleaning with tap water or need to switch to distilled.
US zip codes only. Sources: USGS Water Hardness Survey 2023, EPA municipal CCR data.
Tap is workable for most surfaces, but on dark or low-angle glass you will start to see faint mineral haze after the second or third wash. Switch to distilled for the rinse step on anything that catches direct light.