Hardest Water in Maryland
15 cities ranked by water hardness. Hagerstown tops the list at 110 PPM.
Maryland's water hardness varies significantly by city and water source. The state average across our database is 67 PPM, which is moderately hard. Some cities need treatment while others do not. 0% of cities we track in Maryland have hardness above 120 PPM.
Salisbury has the softest water at just 30 PPM. No softener is needed.
| # | City | PPM | GPG | Level | Softener? |
|---|---|---|---|---|---|
| 1 | Hagerstown | 110 | 6.4 | Moderately Hard | Optional |
| 2 | Gaithersburg | 110 | 6.4 | Moderately Hard | Optional |
| 3 | Bel Air | 90 | 5.3 | Moderately Hard | Optional |
| 4 | Glen Burnie | 80 | 4.7 | Moderately Hard | Optional |
| 5 | Cumberland | 80 | 4.7 | Moderately Hard | Optional |
| 6 | Frederick | 69 | 4 | Moderately Hard | Optional |
| 7 | Rockville | 61 | 3.6 | Moderately Hard | Optional |
| 8 | Baltimore | 60 | 3.5 | Moderately Hard | Optional |
| 9 | Germantown | 58 | 3.4 | Slightly Hard | No |
| 10 | Columbia | 55 | 3.2 | Slightly Hard | No |
| 11 | Silver Spring | 55 | 3.2 | Slightly Hard | No |
| 12 | Bowie | 52 | 3 | Slightly Hard | No |
| 13 | Waldorf | 48 | 2.8 | Slightly Hard | No |
| 14 | Annapolis | 45 | 2.6 | Slightly Hard | No |
| 15 | Salisbury | 30 | 1.8 | Slightly Hard | No |
Frequently Asked Questions
What is the average water hardness in Maryland?
Across 15 cities in our database, the average water hardness in Maryland is 67 PPM (3.9 GPG). This ranges from 30 PPM in Salisbury to 110 PPM in Hagerstown.
Do I need a water softener in Maryland?
It depends on your city. 0% of Maryland cities in our database (0 of 15) have hardness above 120 PPM where a softener provides measurable benefit. Check your specific city above.
Which Maryland city has the softest water?
Salisbury has the softest water in Maryland at 30 PPM (1.8 GPG). No water softener is needed at this level.
What causes hard water in Maryland?
Hard water in Maryland is caused by dissolved calcium and magnesium from the local geology. Regional geology varies, with some areas having limestone bedrock that adds minerals and others with granite or sandstone that produces softer water.