Hardest Water in Ohio

34 cities ranked by water hardness. Wooster tops the list at 360 PPM.

Ohio's water hardness varies significantly by city and water source. The state average across our database is 219 PPM, which is very hard. Most Ohio households will benefit from a water softener. 100% of cities we track in Ohio have hardness above 120 PPM.

Wooster has the hardest water at 360 PPM (21.1 GPG). At this level, expect visible scale on faucets, reduced water heater efficiency, and higher soap usage. A salt-based water softener typically pays for itself within 12-18 months in energy and consumable savings.

#CityPPMGPGLevelSoftener?
1Wooster36021.1Extremely HardYes
2Medina34019.9Extremely HardYes
3Delaware32018.7Extremely HardYes
4Lewis Center32018.7Extremely HardYes
5Westerville30017.5Extremely HardYes
6West Chester30017.5Extremely HardYes
7Fairfield29017Extremely HardYes
8Findlay28016.4Extremely HardYes
9Mason28016.4Extremely HardYes
10Gahanna28016.4Extremely HardYes
11Zanesville27516.1Extremely HardYes
12Newark27015.8Extremely HardYes
13Dayton26715.6Extremely HardYes
14Springfield26515.5Extremely HardYes
15Kettering26015.2Extremely HardYes
16Columbus Northwest26015.2Extremely HardYes
17Stow20011.7Very HardYes
18Strongsville20011.7Very HardYes
19Columbus18010.5Very HardYes
20Lorain17810.4HardRecommended
21Mansfield1659.6HardRecommended
22Youngstown1609.4HardRecommended
23Elyria1559.1HardRecommended
24Cuyahoga Falls1559.1HardRecommended
25Mentor1508.8HardRecommended
26Beachwood1508.8HardRecommended
27Toledo1488.7HardRecommended
28Parma1458.5HardRecommended
29Cleveland1368HardRecommended
30Akron1357.9HardRecommended
31Lakewood1357.9HardRecommended
32Hamilton1287.5HardRecommended
33Canton1257.3HardRecommended
34Cincinnati1237.2HardRecommended

Frequently Asked Questions

What is the average water hardness in Ohio?
Across 34 cities in our database, the average water hardness in Ohio is 219 PPM (12.8 GPG). This ranges from 123 PPM in Cincinnati to 360 PPM in Wooster.
Do I need a water softener in Ohio?
It depends on your city. 100% of Ohio cities in our database (34 of 34) have hardness above 120 PPM where a softener provides measurable benefit. Check your specific city above.
Which Ohio city has the softest water?
Cincinnati has the softest water in Ohio at 123 PPM (7.2 GPG). No water softener is needed at this level.
What causes hard water in Ohio?
Hard water in Ohio is caused by dissolved calcium and magnesium from the local geology. Limestone and dolomite bedrock are the primary sources, dissolving minerals into groundwater and surface water as it flows through the rock.