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  Proficiency Testing (PT): Metals in natural waters (Round October 2026)

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  Proficiency Testing (PT): Metals in sewage sludge (Round March 2026)

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  Proficiency Testing (PT): Metals in sewage sludge (Round October 2026)

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  Proficiency Testing (PT): Metals in wastewaters (Round March 2026)

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  Proficiency Testing (PT): Metals in wastewaters (Round October 2026)

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  Proficiency Testing (PT): Microbiological parameters in drinking water (Round February 2026)

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  Proficiency Testing (PT): Microbiological parameters in drinking water (Round September 2026)

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  Proficiency Testing (PT): Pesticides in natural waters (Round April 2026)

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  Proficiency Testing (PT): Pesticides in natural waters (Round November 2026)

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  Proficiency Testing (PT): Polycyclic Aromatic Hydrocarbons (PAHs) in natural waters (Round April 2026)

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  Proficiency Testing (PT): Polycyclic Aromatic Hydrocarbons (PAHs) in natural waters (Round November 2026)

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  Proficiency Testing (PT): Volatile Organic Compounds (VOCs) in natural waters (Round November 2026)

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