The Immersion Ultrafiltration Membrane Assembly market refers to the global industry involved in the design, manufacture, and supply of ultrafiltration membrane assemblies used in immersion systems for water and wastewater treatment. The Immersion Ultrafiltration Membrane Assembly market size is estimated to be around $1.3 billion in 2025, with a growth outlook that is positive, driven by increasing demand for efficient water treatment solutions. The market forecast suggests a compound annual growth rate (CAGR) of 7-8% from 2026 to 2033, with the industry expansion being driven by technological advancements, stringent regulations, and rising consumer awareness about water conservation. The scope of the market includes various types of ultrafiltration membrane assemblies, such as hollow fiber, flat sheet, and spiral wound, used in different applications, including municipal, industrial, and commercial water treatment.