Online Searchable Laboratory Listing

Check a laboratory's scope of certification or find laboratories that perform specific analyses and/or methods.
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William X. Wall Experiment Station (WES)

MassDEP's environmental analysis facility, which provides technical and laboratory support to DEP programs and administers the Department's Laboratory Certification program.
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Approved Perchlorate Laboratories and Related Information

Laboratories certified to test for perchlorate and other information about this contaminant.
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Private well drinking water testing and the use of Massachusetts-certified laboratories

Information for homeowners, boards of health, and licensed well drillers on choosing a lab for water testing.
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Applications, regulations and policies for laboratories

Guidance documents and other resources.
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