Rockville, MD Tap Water Quality

Water safety reports for all 8 ZIP codes in Rockville, Maryland

Average Score

45/100

Health Violations

ZIP Codes

High Lead Risk

of 8 ZIP codes

About Tap Water in Rockville, MD

Tap water quality in Rockville, MD is a significant concern, currently receiving a below-average safety score of 45/100 across 8 ZIP codes. With 0 health-based violations recorded in the past 5 years, systems like WASHINGTON SUBURBAN SANITARY COMMISSION have struggled to maintain compliance with EPA regulations enforced by Maryland Department of the Environment. Residents are strongly encouraged to utilize certified water filtration systems.

A major factor in Rockville's high rating is its flawless health-based violation record. Over the past 5 years of EPA tracking, local water systems have recorded zero health-based violations. This means that regulated contaminants—such as lead, arsenic, and harmful bacteria—have not exceeded the Maximum Contaminant Levels (MCLs) allowed by federal law. Drawing primarily from ground water, the city utilizes advanced filtration to maintain this standard.

Additionally, lead exposure risk remains a critical issue for certain neighborhoods. EPA data indicates that 3 out of 8 ZIP codes in Rockville are rated as High or Very High risk for lead. This risk is often driven by aging homes with pre-1986 plumbing containing lead solder or service lines. Families in these areas should test their tap water and consider NSF/ANSI 53 certified filters.

⚠ Lead Risk Alert: Some ZIP codes in Rockville are rated High or Very High for lead exposure risk based on EPA data. Search your specific ZIP code for a detailed lead level report.

Water Quality by ZIP Code — Rockville, MD

Click any ZIP code for the full water quality report

20850

Rockville, MD

Score: 53/100✓ No violations

20851

Rockville, MD

Score: 53/100✓ No violations

20852

Rockville, MD

Score: 45/100✓ No violations

20853

Rockville, MD

Score: 45/100✓ No violations

20847

Rockville, MD

Score: 40/100✓ No violations

20848

Rockville, MD

Score: 40/100✓ No violations

20849

Rockville, MD

Score: 40/100✓ No violations

20857

Rockville, MD

Score: 40/100✓ No violations

Frequently Asked Questions — Rockville Water Quality

Is tap water safe to drink in Rockville, MD?+

Tap water in Rockville has a grade of D, indicating compliance concerns in recent years. Families with young children or pregnant women should consider using a certified NSF/ANSI 53 water filter for drinking and cooking.

What is the water quality score for Rockville?+

The average water quality score across 8 ZIP codes in Rockville, MD is 45/100. Scores are derived from EPA violation history, lead levels, enforcement actions, and infrastructure risk indicators. Individual ZIP codes may vary — search your specific ZIP above for a personalized report.

Does Rockville have lead in its tap water?+

3 out of 8 ZIP codes in Rockville are rated High or Very High for lead exposure risk. Older homes built before 1986 may have lead service lines or plumbing fixtures. Residents should run their tap for 30 seconds before use and consider a certified NSF/ANSI 53 lead filter.

How do I get the water quality report for Rockville?+

Each ZIP code in Rockville has a full water quality report on this site — click any ZIP code below. You can also get the annual Consumer Confidence Report (CCR) from your local water utility. The CCR is required to be published every year by July 1 and contains actual contaminant measurements and violation history.

Where does Rockville's tap water come from?+

Tap water in Rockville, MD primarily comes from ground water. Groundwater systems pump water from underground aquifers, which is naturally filtered through soil and rock but can still contain naturally occurring contaminants.

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