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National Water Quality Laboratory

Sunday July 22, 2018

Laboratory Proficiency Testing

New York State Department of Health Potable and Non Potable Water Studies

All results in pdf format.

All non potable analyses performed by USGS methods.

The Branch of Quality Systems (BQS)

Environment Canada Proficiency Testing Studies


  • Historical Laboratory Proficiency Testing

  • For inquiries contact: Lisa Bressler (lbressle@usgs.gov)