Guides, tools, and reference pages
Use these pages when a city profile is not enough and you need help interpreting reports, hardness, testing, contaminants, or methodology.
Corrections Policy
Read the guide.
Data Sources
Read the guide.
Editorial Policy
Read the guide.
Fluoride in Drinking Water
Read the guide.
Hardest Water Cities in the MyWaterFacts Dataset
Read the guide.
How to Read a Water Quality Report
Read the guide.
How to Test Tap Water
Read the guide.
Lead in Drinking Water
Read the guide.
Nitrates in Drinking Water
Read the guide.
PFAS in Drinking Water
Read the guide.
Provider Matching Methodology
Read the guide.
Water Filter vs Water Softener
Read the guide.
Water Hardness Converter
Read the guide.
Water Hardness Data Methodology
Read the guide.
Water Hardness Scale
Read the guide.
Water Hardness by City
Read the guide.
Water Softener Sizing Calculator
Read the guide.
Water test checklist
Read the guide.
What Is Hard Water?
Read the guide.
More reference pages
Contaminants
Read plain-English pages about lead, PFAS, fluoride, nitrates, and related water concerns.
Water glossary
Look up common water report and treatment terms.
Methodology
See how MyWaterFacts handles sources, provider matching, confidence, and hardness data.
Corrections policy
How to send source updates or corrections.
Affiliate disclosure
How advertising or affiliate links may be handled.
Copyright policy
Copyright and content ownership information.
State pages
Browse available state-level water and hardness guides.