Certified Laboratories

• Find MassDEP-Certified Laboratories

  A searchable online database of certified laboratories for water testing.

• EPA: List of Laboratories Approved for Cryptosporidium Analysis under the Safe Drinking Water Act
• Certified Laboratories Available Outside Regular Working Hours
• Private Drinking Water Testing and the use of MassDEP-Certified Laboratories 

  In response to frequently asked questions by homeowners, Boards of Health and licensed well drillers, the Massachusetts Department of Environmental Protection (MassDEP) provides the following guidance on private drinking water testing and the use of MassDEP Certified Laboratories. 

• Approved Perchlorate Laboratories and Related Information
• William X. Wall Experiment Station (WES)

Lab Certification

• Regulations & Standards
  •  310 CMR 42.00: Certification and Operation of Environmental Analysis Laboratories
  • ARCHIVED Proposed 310 CMR 4.00 & 310 CMR 42: Timely Action Schedule and Fee Regulations and Certification and Operation of Environmental Analysis Laboratories (2007 - 2) March 2007 
• Applications & Forms
  • Laboratory Certification Forms
• Policies & Guidance
  • Rapid Determination of E. coli in Drinking Water Under the Total Coliform Rule in Massachusetts  file size 1MB file size 2MB
  • Certification for the Analysis of Enterococci (Presence/Absence) in Ground Water Source Samples 
  • Cover Letter, WES-08.001 - Laboratory Certification Office Policy on Chemistry Proficiency Testing 
  • WES-08.001 - Laboratory Certification Office Policy on Chemistry Proficiency Testing 
  • Cover Letter for Microbiology Proficiency Testing Policy 
  • WES-08.002 - Laboratory Certification Office Policy on Microbiology Proficiency Testing 
  • Memorandum on Revised Massachusetts Regulations for the Certification and Operation of Environmental Analysis Laboratories at 310 CMR 42.00 
  • New England Certification Officers' Chemistry Checklists 
  • New England Certification Officers' Microbiology Checklist