Is Randallstown, MD tap water safe?
The short answer
1 of the 2 utilities serving Randallstown has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Maryland’s records: City of Baltimore.
City of Baltimore, which serves the most people here, has 1 result above the legal limit and 1 result above the health goal. The worst: Total trihalomethanes (TTHM) at 62.2 ppb, above the legal limit.
The water from City of Baltimore is moderately hard, typically 94 mg/L (5.5 grains per gallon). How Maryland’s water compares.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Randallstown’s ZIP codes, from EPA’s estimates.
- Open report
City of Baltimore
Maryland · serves 1.6 million people · about 28,300 in Randallstown
1 result above the legal limit and 1 result above the health goal. The worst: Total trihalomethanes (TTHM) at 62.2 ppb, above the legal limit. Hardness: moderately hard, typically 94 mg/L (5.5 grains per gallon).
4 health-based violations since 2016
- Open report
Howard County D.P.W. Distribution
Maryland · serves 286,158 people · about 400 in Randallstown
1 result above the health goal. The worst: Lead at 3.0 ppb, above the health goal.
No health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in City of Baltimore’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Aquasana Clean Water Machine (AQ-CWM2)
Countertop
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Brita Hub Countertop Water Filter System (87340)
Countertop
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
- IAPMO listing:NSF/ANSI 53checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Ninja HydraSense Countertop Water Filtration System (WF1001)
Countertop
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Total trihalomethanes (TTHM), Lead
Water testing near Randallstown
The 3 labs Maryland certifies closest to Randallstown, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Ashburton Water Quality Laboratory
Baltimore, MD · about 6 miles
Certified for bacteria, nitrate, minerals and other inorganics
Phase Separation Science, Inc.
Baltimore, MD · about 6 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
Home Land Labs - Towson
Towson, MD · about 10 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
Maryland Department of Health laboratory: Testing of private well water for bacteria, nitrate, lead, copper, iron, hardness and more, on samples sent in through your local health department. Bacteria is $41, nitrate $18, and lead, copper or iron $20 each. Well Water Testing Fees, Maryland Department of Health.
All 92 certified labs for MarylandWhich ZIP codes are in Randallstown: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: MDE, Maryland's certified drinking water laboratories; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Randallstown
Other towns in Baltimore County with a page of their own.
What to do next
- Read City of Baltimore’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- About Total trihalomethanes (TTHM)What it does to health, where it comes from, and the certification claim that addresses it.About Total trihalomethanes (TTHM)
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water