Check your tap water quality - enter your city to see contaminant data

Know Your Water.
Then Decide.

Free water quality data for 1,000 US cities. See what's in your tap, whether you need to treat it, and what type of system fits your situation.

☣️ Highest PFAS Contamination

Total PFAS detected across all compounds. EPA's 2024 MCL is 4 ppt for PFOA and PFOS individually.

✅ Cleanest Tap Water

No softener needed. No filter needed. Just good water.

🏆 Cleanest

Sitka, AK

8 PPM

Gloucester, MA

10 PPM

Portland, ME

10 PPM

Marion, NC

⚠️ Highest Lead Levels

Old pipes. No safe level. Get tested if your home is pre-1986.

⚠ Highest Lead

Elgin, IL

40 ppb

Moore, OK

34.7 ppb

Troy, NY

25 ppb

Peoria, IL

Browse all 1000 city reports → Hardness, PFAS, lead, chlorine, and treatment sizing for every city