Maryland Water Quality Report
Tap water quality data for 2 cities in Maryland, updated 2026.
US average: 100 ppm
1 of 2 cities violation-free
2 cities tested
2 water systems tracked
Cleanest Tap Water in Maryland
Cities with the fewest water quality issues
Most Water Quality Issues in Maryland
Cities with the most violations and concerns
Maryland Tap Water: What You Need to Know
Maryland has 2 tracked water utilities serving approximately 1.9M residents. The average water hardness is 85 ppm (5 GPG), classified as Moderately Hard — below the national average of 100 ppm. Hardness ranges from 85.4 ppm in Glen Burnie-broadneck to 85.4 ppm in Glen Burnie-broadneck.
In the past 3 years, 1 of 2 cities in Maryland have recorded water quality violations, totaling 20 violations (0 health-based). All 2 tested cities have lead levels below the EPA action level of 15 ppb.
Frequently Asked Questions About Maryland Water
Is tap water safe to drink in Maryland?
Most tap water in Maryland meets EPA standards, but 1 cities have recorded violations in the past 3 years (0 health-based). We recommend checking your specific city's report on TapWater.org and considering a home water test.
How hard is the water in Maryland?
Maryland's average water hardness is 85 ppm (5 GPG), classified as Moderately Hard. This is below the national average of 100 ppm. Hardness varies significantly by city — use our Water Hardness Calculator to check your specific area.
Which city in Maryland has the cleanest tap water?
Based on EPA violation data, lead testing, and water quality metrics, Glen Burnie-broadneck ranks as having the cleanest tap water in Maryland. It has zero violations in the past 3 years and lead levels well below the EPA action level.
Which city in Maryland has the most water quality issues?
Baltimore currently has the most water quality concerns in Maryland, with 20 violations in the past 3 years. Residents should check their city's detailed water quality report and consider using a certified water filter.
Where does Maryland get its water from?
The majority of Maryland's water systems (50%) use surface water as their primary source. Surface water comes from rivers, lakes, and reservoirs. Each city's specific source can vary — check individual city reports for details.