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Tap Water Quality in Gaithersburg, Maryland (ZIP 20878)

Serving Gaithersburg, Maryland

Monitor

2 above health guidelines

City

19+

Tested

Above Guidelines

Utility

Is the Tap Water Safe in Gaithersburg, Maryland?

Tap water in Gaithersburg, Maryland (ZIP 20878) has 2 contaminants above EPA health-based guidelines (MCLGs) in at least one of the 1 city served. We recommend reviewing detailed city reports below and considering a certified water filter for additional protection.

ZIP 20878 is served by 1 water utility providing water to Gaithersburg. Water quality varies by utility and city. Click on the cities below to see detailed reports for your specific area.

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Water Quality Report for ZIP 20878

2 contaminants above EPA health guidelines

These levels represent the worst case across all cities in this ZIP code. Check individual city reports for specific details.

Bromodichloromethane

Found in Gaithersburg

11.3 PPB

Guideline: 0 PPB

Dichloroacetic Acid (DCA)

Found in Gaithersburg

0.0121 PPM

Guideline: 0 PPM

Water Utilities Serving ZIP 20878

D.C. WATER AND SEWER AUTHORITY

People Served:

632,323

Contact:

202-364-3148

Water Source:

Surface water purchased

Contaminants Tested:

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Best Water Filters for Gaithersburg (ZIP 20878)

Based on the contaminants found in your area, we recommend NSF-certified water filters that can remove the specific contaminants above health guidelines.

Reverse Osmosis Filters Under-Sink Filters View All Filters

Frequently Asked Questions about Gaithersburg Tap Water

Is the tap water safe in Gaithersburg, Maryland (ZIP 20878)?

Tap water in Gaithersburg, Maryland (ZIP 20878) has 2 contaminants above EPA health-based guidelines (MCLGs) in at least one of the 1 city served. We recommend reviewing the detailed city reports below and considering a certified water filter for additional protection.

Which water utilities serve ZIP code 20878?

ZIP code 20878 is served by 1 water utility: D.C. WATER AND SEWER AUTHORITY.

How do I pay my water bill in Gaithersburg (ZIP 20878)?

D.C. WATER AND SEWER AUTHORITY (the largest utility serving ZIP 20878) handles billing for most Gaithersburg addresses. Call 202-364-3148 to pay your bill or set up online payments.

What contaminants are in Gaithersburg water (ZIP 20878)?

Water testing in ZIP 20878 found 2 contaminants above EPA health guidelines: Bromodichloromethane, Dichloroacetic Acid (DCA).

Should I use a water filter in Gaithersburg (ZIP 20878)?

Yes, we recommend using an NSF-certified water filter for ZIP 20878 because 2 contaminants are above EPA health guidelines. Reverse osmosis systems or under-sink filters certified to remove the specific contaminants found in your water are recommended.

What cities are in ZIP code 20878?

ZIP code 20878 serves Gaithersburg, Maryland.

How we built this page

Water-quality data on this page comes from public federal and state records for the 1 utility serving ZIP 20878. We refresh each utility's record whenever its underlying source publishes new data.

Contaminants & violations: EPA Safe Drinking Water Information System (SDWIS) plus the Unregulated Contaminant Monitoring Rule (UCMR-5) for PFAS and emerging contaminants.
Annual reports: the most recent published Consumer Confidence Report (CCR) from each utility serving this ZIP, where available.
Service area & contact: EPA SDWIS plus the Maryland Department of Environmental Protection / Drinking Water program.

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