About the data

Hardness figures

Each city page cites a utility document or FAQ. Hardness is often voluntary in Texas Consumer Confidence Reports because it is not a federally regulated contaminant. Where a utility publishes grains and mg/L, we keep both. Where only one unit appears, we convert with 17.1 mg/L per grain when the utility (or a peer Texas utility) publishes that factor.

USGS classification used on this site (mg/L as CaCO3): soft 0–60; moderately hard 61–120; hard 121–180; very hard above 180. USGS Hardness of Water.

Installer contacts

TCEQ Water Treatment Specialist names and business contacts appear only when the license holder authorized release. Spreadsheet: License Holder Spreadsheet. Licensing overview: WTS license page.

This build has 6 city hardness rows and 21 authorized-release WTS contacts.