Check Your Water Hardness
Enter your ZIP code or city name to see your water hardness level, what it means, and whether you need treatment.
Covering 200+ ZIP codes across Las Vegas metro, Phoenix metro, and more cities coming soon.
Compare Water Hardness Across Cities
Featured City
Very HardLas Vegas, NV
Colorado River via Lake Mead
Hardness
18 GPG
304 PPM
TDS
642 ppm
Total Dissolved Solids
Population
2.3M
Residents served
Source
Lake Mead
Colorado River
Key Minerals (mg/L)
Also in Las Vegas Metro
Quick Facts
85%
of US homes have hard water
$800+
annual cost of hard water damage
30%
more soap needed with hard water
17 GPG
Las Vegas - hardest major US city
Water Hardness Rankings
Understanding Water Hardness
About Our Data
Official Sources
Data from EPA and municipal CCR reports
Updated Annually
Refreshed when new reports publish
Source Links
Direct links to original documents
Database Stats
- Cities covered
- 12
- Last updated
- February 2026
- Data sources
- EPAMunicipal CCR Reports
How We Source Data
All water hardness data comes from official Consumer Confidence Reports (CCRs) published by municipal water utilities, as required by the EPA.
- Primary data from official CCR reports
- Updated annually when new reports publish
- Links to source documents provided