Description General description This proficiency testing sample is produced in accordance with ISO/IEC 17043:2010. All information regarding the use of this material can be found in the reporting packet supplied for each sample. Other Notes Proficiency testing samples are presented as single blind. No values for the samples are released until the testing period concludes. Values of analytes vary lot to lot. Proficiency Testing Schedule (2020-2021) Wastewater WP20-1 January 15 - February 28, 2020 WP20-2 March 25 - May 8, 2020 WP20-3A May 13 - June 26, 2020 WP20-3B July 8 - August 21, 2020 WP20-4 September 23 - November 6, 2020 WP20-5 November 25 - January 8, 2021 WP21-1 January 13 - February 26, 2021 WP21-2 March 24 - May 7, 2021 WP21-3 July 7 - August 20, 2021 WP21-4 September 22 - November 5, 2021 Quick-Turn Study - (non-scheduled proficiency test that is available at any time)