Type a US zip code to see what is in your tap water and how to tune it for coffee. Everything runs in your browser; nothing is sent anywhere.
Covered so far: Chicago (606xx), Portland, OR (972xx) Denver (802xx) and Johnson County, KS (662xx) and Clackamas River Water, OR (97015, 97086) Madison, WI (537xx) and Seattle (981xx), New York City and Boston (hardness only), Washington DC, San Francisco, Houston, Los Angeles, San Diego, Phoenix, Minneapolis (554xx), Columbus, OH (430xx-432xx) and Philadelphia (ranges by source, not mapped to your street), plus Cary and Raleigh, NC, and Salt Lake City (841xx). More areas are added as utilities publish usable figures; many publish hardness only. Values are from each utility's published analyses (linked in results); your tap may differ by building plumbing or service area.