1. Find the right provider
City limits and water-system boundaries do not always match. Start here if you are unsure who serves the address.
2. Open the city profile
Use the profile for provider context, official report links, hardness notes, and testing guidance.
3. Check hardness
Useful for scale, spots, dishwasher residue, and softener planning.
4. Read the report carefully
Public reports describe the water system, not your exact faucet or building plumbing.
Examples where the details matter
Houston, TX
Multiple system caveats and source-backed hardness ranges.
Phoenix, AZ
Official hard-to-very-hard water range.
New York City, NY
Generally soft water, but building plumbing still matters.
Portland, OR
Bull Run supply vs groundwater hardness context.
San Diego, CA
Very hard water guidance from city materials.
Miami, FL
County-provider context matters before using the report.
When a home test is still useful
A public water report can be clean and still not answer a household question. Testing may be useful for older plumbing, taste or odor, staining, private wells, lead concerns, recent plumbing work, or equipment sizing.