The Water Facilities Testing Laboratory is engaged in conducting accredited and non-accredited testing the effectiveness of domestic wastewater treatment plant operation and determination of residual oil content from light liquid separators and grease traps according to standard operating procedures. The laboratory holds a Certificate of accreditation according to the CSN EN ISO standard issued by the Czech Accreditation Institute. In 2006, the laboratory was accredited for testing treatment effectiveness according to CSN EN 12566-3 Small wastewater treatment plants up to 50 equivalent inhabitants. As part of the tests, it is possible to independently test the effectiveness of small domestic wastewater plants and light liquid separators (grease traps), not only for kitchen operations. Each time the output is a test report with or without reference to the accreditation of the testing laboratory.