Laboratories that analyze biological samples, chemical warfare agents, radiological, or toxic industrial chemical samples can join the Environmental Response Laboratory Network (ERLN). Members of the ERLN make up a critical infrastructure that delivers data necessary for responses to large scale national emergencies.

ERLN is coordinating recruitment efforts with EPA's Water Laboratory Alliance, which focuses on State and local drinking and waste water utility laboratories.

Laboratories applying for membership must complete the following requirements:

• Review Policy for Membership in the ERLN. 
• Complete Laboratory Membership for ERLN Application
• Read and sign the Laboratory Acknowledgement of ERLN Membership Requirements section of the application
• Confirm laboratory participation in the Water Laboratory Alliance program
• Register in the EPA Compendium of Environmental Testing Laboratories
• Provide supporting documentation with the application. This includes:
  • accreditation qualifications
  • certificates from accrediting authorities
  • plans and procedures
  • sample management, handling, and storage
  • laboratory affiliations, memberships, special registrations, approvals, and licenses
  • other related support documentation

Submit the complete application packet to the points of contact noted in the active solicitation. The laboratory is notified of membership status within 60 days of EPA's receipt of the application packet. Processing of the membership application may be delayed if the laboratory did not provide all the requested documentation.