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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Water quality data for 1 cities serving 1,600,000 residents
Baltimore County in Maryland has an average water quality score of 72/100 (Grade C) based on analysis of 1 municipal water systems. The county's water systems serve approximately 1,600,000 residents.
Water quality in Baltimore County is fair, with some cities showing room for improvement. Baltimore has the best water quality at 72/100.
1 cities ranked by water quality score
| Rank | City | Score | Grade | Population |
|---|---|---|---|---|
| 1 | Baltimore Biggest deduction: 2 health-based violations (MCL/treatment-technique) in the last 5 years (−20 pts) | 72 | C | 1,600,000 |
Real EPA readings across county water systems (lead: latest 90th percentile; PFAS: UCMR5 2023–2026; others: 2012–2019 averages)
| Contaminant | Avg Level | Max Level | EPA Limit | % of Limit | Cities |
|---|---|---|---|---|---|
| HAA5 (2012–2019 avg) | 40.287 ug/L | 40.287 ug/L | 60 ug/L | 67.1% | 1 |
| TTHM (2012–2019 avg) | 48.45 ug/L | 48.45 ug/L | 80 ug/L | 60.6% | 1 |
| Nitrate (2012–2019 avg) | 2.083 mg/L | 2.083 mg/L | 10 mg/L | 20.8% | 1 |
| Fluoride (2012–2019 avg) | 0.74 mg/L | 0.74 mg/L | 4 mg/L | 18.5% | 1 |
| Lead (90th percentile) | 2.74 ppb | 2.74 ppb | 15 ppb | 18.3% | 1 |
| Radium (2012–2019 avg) | 0.433 pCi/L | 0.433 pCi/L | 5 pCi/L | 8.7% | 1 |
| PFAS (PFOA/PFOS max, UCMR5) | 0 ppt | 0 ppt | 4 ppt | 0% | 1 |
| Arsenic (2012–2019 avg) | 0 ug/L | 0 ug/L | 10 ug/L | 0% | 1 |
Recent violations across county water systems
Health-based: MCL exceeded — Maximum Contaminant Level Violation, E. coli (RTCR) - Revised Total Coliform Rule
8/31/2022
Health-based: MCL exceeded — Maximum Contaminant Level Violation, Average - Total Haloacetic Acids (HAA5)
12/31/2015
Water quality in Baltimore County, Maryland reflects the region's unique combination of water sources, treatment infrastructure, and environmental factors. Our comprehensive analysis examines 1 municipal water systems serving a combined population of over 1,600,000 residents.
The county shows moderate water quality performance, with scores ranging from 72/100 in Baltimore to 72/100 in Baltimore. This 0-point spread indicates relatively consistent water quality standards across municipal systems.
The most prevalent contaminants detected across Baltimore County water systems include HAA5 (2012–2019 avg), TTHM (2012–2019 avg), Nitrate (2012–2019 avg). At least one reading averages above 50% of its EPA limit across the county's systems, worth attention from residents and utilities.
Water quality in Baltimore County is fair but shows room for improvement. Residents in cities scoring below 70 should consider water filtration, particularly for drinking and cooking. Check your specific city's report above for personalized recommendations.
Baltimore County has an average water quality score of 72/100 (Grade C) based on analysis of 1 municipal water systems serving 1,600,000 residents.
Baltimore has the highest water quality score in Baltimore County at 72/100. View the detailed report for Baltimore.
Given the water quality variation across Baltimore County, we recommend reviewing your specific city's water quality report. 0 cities have scores below 70, where filtration is particularly recommended.
Click on any city in the rankings table above to view its detailed water quality report, including contaminant levels, EPA compliance history, and filter recommendations.