Compost, mulch, and soil conditioner producers in Australia must test their products to AS 4454 to demonstrate compliance with quality and safety requirements before sale. AS 4454 covers the assessment of soil conditioners, composts, and mulches across a range of physical, chemical, and biological parameters including maturity, pH, electrical conductivity, moisture content, organic matter, nutrient content, and contaminant screening. Compliance with AS 4454 is increasingly required by councils, landscape specifiers, and major procurement programs for materials used in public open space, revegetation, and civil landscaping projects. Western Geotechnical Laboratory Services (WGLS) provides the AS 4454 Testing Suite for Soil Conditioners, Composts and Mulches from our laboratory in Welshpool, Perth, supporting producers, processors, and suppliers across Western Australia in meeting their compliance obligations.
