University of Maryland Extension

Certified Water Testing Labs

The Maryland Department of the Environment annually updates the list of certified water testing labs. We have culled the list to provide you with the contact information for the labs that serve homeowners. This list was last updated in 2019 - some of the information may be outdated. You can confirm their status by referring to the MDE list or contacting your county health department. 

Northern and Central Maryland Labs

Caswell Testing & Water Systems (Jarrettsville, MD)

Catoctin Labs (Thurmont, MD)

Community Environmental Laboratories (Aberdeen, MD)

Enviro-Chem Laboratories (Sparks, MD)

Fountain Valley Analytical Laboratory (Westminster, MD)

Fredericktowne Labs (Frederick, MD)

Martel Laboratories (Baltimore, MD)

Water Testing Labs of Maryland (Assorted Locations)

Eastern Shore

Chesapeake Environmental Laboratory (Stevensville, MD)

Water Testing Labs of Maryland (Assorted Locations)

Southern Maryland

Environmental Testing Lab (Assorted Locations)

Water Testing Labs of Maryland (Assorted Locations)

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