The concept of a National Contaminated Land Officers Group was developed in 2018 by Anita Metelko, Ann Barker, Julia Reynolds and Sarah Greenhough, CLOs from the West Midlands, Yorkshire and Lincolnshire. A survey of CLOs confirmed that there was a large appetite across the UK to form a national body.  
 
NCLOG was launched in 2019 at the Molineux Stadium in Wolverhampton. The Interim Steering Committee established the initial governance of NCLOG, setting up a membership application system and contacting CLOGs across the UK. The work of NCLOG began in earnest at this time with regular events and consultation responses. NCLOG activities were restricted during the Covid-19 pandemic, but by 2021 the organisation was developing apace and had become the ‘go to’ organisation for those wishing to engage with CLOs; running training events and webinars, presenting at conferences and publishing guidance. NCLOG has continued to maintain close links with CLOGs, as well as working closely with government and other key stakeholders, and is represented on the National Brownfield Forum. 
 
NCLOG joined the IES family in January 2025 to continue to develop its operations, reach and influence, and support collaboration across environmental professional communities.