Water Hardness in Maryland

24 counties — Average 65.8 PPM (Moderately Hard)

12
9
3
Soft (50.0%) Moderate (37.5%) Hard (12.5%) Very Hard (0.0%)

Maryland Water Hardness Map

Soft   Moderate   Hard   Very Hard

Maryland

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All 24 Counties — By Water Hardness

CountyClassificationHardness
Allegany Moderate 108 PPM
Anne Arundel Soft 44 PPM
Baltimore Hard 133 PPM
Baltimore Moderate 96.4 PPM
Calvert Hard 138.5 PPM
Caroline Soft 37.8 PPM
Carroll Soft 51.5 PPM
Cecil Moderate 88 PPM
Charles Soft 11 PPM
Dorchester Soft 37.3 PPM
Frederick Soft 29.5 PPM
Garrett Moderate 62 PPM
Harford Moderate 72.9 PPM
Howard Soft 43.4 PPM
Kent Soft 57.6 PPM
Montgomery Soft 43 PPM
Prince George's Moderate 70 PPM
Queen Anne's Moderate 62.8 PPM
Somerset Soft 47.2 PPM
St. Mary's Soft 29 PPM
Talbot Moderate 61 PPM
Washington Hard 160 PPM
Wicomico Soft 20 PPM
Worcester Moderate 76 PPM

Source: USGS Water Quality Portal

Frequently Asked Questions

How hard is the water in Maryland?

Maryland has an average water hardness of 65.8 PPM, classified as moderately hard. Out of 24 counties, 12 have soft water, 9 moderately hard, 3 hard, and 0 very hard.

Which Maryland counties have the hardest water?

See the county table above for a complete breakdown by hardness level.

How do I check water hardness for my Maryland address?

Enter your ZIP code in the search box above to see your area's estimated water hardness, classification, and water utility information.