Hardest Water in Oklahoma
14 cities ranked by water hardness. Ada tops the list at 300 PPM.
Oklahoma's water hardness varies significantly by city and water source. The state average across our database is 217 PPM, which is very hard. Most Oklahoma households will benefit from a water softener. 100% of cities we track in Oklahoma have hardness above 120 PPM.
Ada has the hardest water at 300 PPM (17.5 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.
| # | City | PPM | GPG | Level | Softener? |
|---|---|---|---|---|---|
| 1 | Ada | 300 | 17.5 | Extremely Hard | Yes |
| 2 | Moore | 280 | 16.4 | Extremely Hard | Yes |
| 3 | Edmond North | 260 | 15.2 | Extremely Hard | Yes |
| 4 | Norman South | 240 | 14 | Very Hard | Yes |
| 5 | Norman | 236 | 13.8 | Very Hard | Yes |
| 6 | Broken Arrow | 224 | 13.1 | Very Hard | Yes |
| 7 | Owasso | 210 | 12.3 | Very Hard | Yes |
| 8 | Lawton | 204 | 11.9 | Very Hard | Yes |
| 9 | Oklahoma City North | 200 | 11.7 | Very Hard | Yes |
| 10 | Edmond | 197 | 11.5 | Very Hard | Yes |
| 11 | Tahlequah | 180 | 10.5 | Very Hard | Yes |
| 12 | Muskogee | 180 | 10.5 | Very Hard | Yes |
| 13 | Oklahoma City | 170 | 9.9 | Hard | Recommended |
| 14 | Tulsa | 154 | 9 | Hard | Recommended |
Frequently Asked Questions
What is the average water hardness in Oklahoma?
Across 14 cities in our database, the average water hardness in Oklahoma is 217 PPM (12.7 GPG). This ranges from 154 PPM in Tulsa to 300 PPM in Ada.
Do I need a water softener in Oklahoma?
It depends on your city. 100% of Oklahoma cities in our database (14 of 14) have hardness above 120 PPM where a softener provides measurable benefit. Check your specific city above.
Which Oklahoma city has the softest water?
Tulsa has the softest water in Oklahoma at 154 PPM (9 GPG). No water softener is needed at this level.
What causes hard water in Oklahoma?
Hard water in Oklahoma 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.