Hardest Water in Delaware
5 cities ranked by water hardness. Dover tops the list at 52 PPM.
Delaware's water hardness varies significantly by city and water source. The state average across our database is 31 PPM, which is relatively soft. Most homes do not need a water softener. 0% of cities we track in Delaware have hardness above 120 PPM.
Wilmington has the softest water at just 22 PPM. No softener is needed.
| # | City | PPM | GPG | Level | Softener? |
|---|---|---|---|---|---|
| 1 | Dover | 52 | 3 | Slightly Hard | No |
| 2 | Middletown | 30 | 1.8 | Slightly Hard | No |
| 3 | Smyrna | 28 | 1.6 | Slightly Hard | No |
| 4 | Newark | 25 | 1.5 | Slightly Hard | No |
| 5 | Wilmington | 22 | 1.3 | Slightly Hard | No |
Frequently Asked Questions
What is the average water hardness in Delaware?
Across 5 cities in our database, the average water hardness in Delaware is 31 PPM (1.8 GPG). This ranges from 22 PPM in Wilmington to 52 PPM in Dover.
Do I need a water softener in Delaware?
It depends on your city. 0% of Delaware cities in our database (0 of 5) have hardness above 120 PPM where a softener provides measurable benefit. Check your specific city above.
Which Delaware city has the softest water?
Wilmington has the softest water in Delaware at 22 PPM (1.3 GPG). No water softener is needed at this level.
What causes hard water in Delaware?
Hard water in Delaware is caused by dissolved calcium and magnesium from the local geology. Most of the state has favorable geology with granite, metamorphic, or volcanic rock that contributes minimal dissolved minerals.