Online Searchable Laboratory Certification Listing


For guidance using MassDEP-certified laboratories for private drinking water testing go to:

Private Well Guidelines are available at:

Enter Search Criteria:
Certified Lab Name:
Certified Lab Id#:
Region: Find Your Region
Microbiology Rule Code:

Status:  C = Certified, P = Provisionally Certified, R = To be revoked on the effective date shown. Provisional certification means that the Department deems the laboratory capable of producing valid data despite minor deficiencies. The Department may accept results from laboratories that are certified or provisionally certified by the Department.

NEW: You can now search by one or more specific analytes (e.g., lead and copper and fluoride) or methods. To find all the laboratories certified for the specific analytes or methods you are interested in, select the first analyte or method by clicking on it, then hold the control key down while making additional selections. Click the Search button when finished with your selections. Note: The screen will repaint after each analyte selection. Remember to click the Reset Search Criteria to All button before beginning a new search.

If your search results in no laboratories shown, try changing your search criteria to All Analytes and/or All Methods.  After changing search criteria, you must click the Search button again.

This information is updated daily.

However, changes to certification status may occur at anytime as laboratories gain or lose certification for one or more analytes / methods and laboratories are added to and removed from the certification program.

To confirm a laboratory's certification status, call (978) 682-5237 or e-mail Labcert@Mass.Gov

To report problems or suggestions with this web page contact EEA.ServiceDesk@Mass.Gov