United States

AIHA Proficiency Analytical Testing Programs, LLC
(EMPAT – Fungal- Cultural, EMPAT – Fungal- Direct Exam, EMPAT – Bacterial- Culturable)
Angela Oler: 703-846-0757

Wisconsin State Laboratory of Hygiene
(CDC ELITE/WSLH Legionella only)​
800-462-5261
PTService@slh.wisc.edu 

NSI Lab Solutions/ZeptoMetrix
(limited acceptability - see Scope/PT Table​​)
919-789-3000
nsi@nsilabsolutions.com

United Kingdom

Food & Environmental Proficiency Testing Unit
(FEPTU for Legionella)
+44 (0) 161 762 2500
foodeqa@phe.gov.uk

Canada

Proficiency Testing Canada
(PTC for E. coli)
+44 (0) 161 762 2500
programofficer@ptcanada.org

Global

ERA
(limited acceptability for E. coli - see Scope/PT Table​​)
303-431-8454
info@eraqc.com

Global Proficiency Testing Company
(GPTC - MICA Methods for Legionella​​)
+91 8076884320
qa@globalptprovider.com

LGC Standards Proficiency Testing
(Water Analysis Scheme (QWAS) limited acceptability - see Scope/PT Table​​)
603-622-7660
SupportNA@lgcgroup.com