WCS is a provider of integrated water treatment and quality management services. It provides a broad range of water treatment, hygiene, testing and engineering services and is headquartered in Gloucestershire with around 90 employees. The company was founded in 1987 and has a long-standing base of customers across the UK in both the private and public sectors, including leisure, retail, defence and engineering, local authorities and NHS trusts. 


Founded in 1997, Advance Environmental employs 40 people and services over 100 customers with a strong focus on healthcare, including a large number of NHS and private hospitals and large national care groups alongside a range of other customers in a broad range of sectors such as education and leisure.


H2O is a provider of water treatment and hygiene services headquartered in Leeds and employing 84 staff from 3 offices across the UK. Founded in 1992, it is a national business with a strong presence in the Midlands and Yorkshire and a base of customers in a range of sectors including industrial, leisure, food production, higher education and healthcare.


Founded in 2000, Guardian operates nationally from headquarters in Basildon, Essex, and employs around 90 staff. Guardian provides a comprehensive portfolio of water treatment, hygiene and pre-commissioning services to over 400 customers with a significant presence within the facilities management, engineering and manufacturing sectors.