30+ Central Ohio ZIPs · Updated 2026
What's in Your Water?
Enter your ZIP code to see your water hardness, detected contaminants, and the right treatment for your home.
Enter a Central Ohio ZIP code above to see your water quality data.
Browse by County
Delaware County
Fairfield County
Franklin County
Licking County
Madison County
Pickaway County
Union County
Not sure what your water needs?
Our free in-home water test gives you lab-accurate results — hardness, iron, chloramines, TDS, and pH — in about 30 minutes. No obligation.