Water Quality in Maryland: Complete Guide
Everything homeowners need to know about Maryland tap water - hardness, contaminants, treatment options, and costs.
Quick summary: Maryland has an average water hardness of 67 PPM across 15 cities. 0% of cities have hard water above 120 PPM. PFAS contamination is detected above EPA limits in at least one city. Most households do not need water softening equipment.
Water Hardness Across Maryland
Maryland's water hardness ranges from 30 PPM in Salisbury to 110 PPM in Hagerstown, with a statewide average of 67 PPM. This makes Maryland one of the softer-water states. The national average is approximately 120 PPM.
Most Maryland cities use surface water (rivers, lakes, reservoirs), which generally has lower mineral content than groundwater.
Contaminants of Concern in Maryland
PFAS: The average PFAS level across Maryland cities is 6.9 ppt. Salisbury has the highest detected PFAS at 37.3 ppt, above the EPA maximum contaminant level of 4 ppt. Residents should consider a reverse osmosis or NSF P473-certified filter for drinking water.
Lead: Lead contamination comes from plumbing infrastructure, not the water source. Maryland homes built before 1986 are at higher risk due to lead solder. 1 cities show lead levels above 5 ppb.
Do You Need a Water Softener in Maryland?
For most Maryland residents, no. Only 0% of cities have hard water above 120 PPM. However, individual situations vary - check your city page for specific data.
Impact of Hard Water in Maryland
With an average hardness of 67 PPM, most Maryland households do not face significant hard water impact. However, homes with hardness above 120 PPM should evaluate treatment options.