Fri, 18 Jul 2025 | BUSINESS SALE
RES Environmental, an urban drainage modelling consultancy, has been acquired by environmental consultancy provider Aqua Consultants, which is part of the Adler & Allan Group.
The acquisition is the eighth acquisition that Goldman Sachs-backed Adler & Allan has made in the utilities industry, as well as its 12th overall in the past three years, and follows its acquisition of drainage and civil engineering experts Glanville Environmental in April 2025.
Based in Sheffield and Exeter, RES Environmental has a 35-strong team. The company provides services including integrated catchment modelling, wastewater modelling, flood risk management, drainage design and sustainable drainage services to UK water companies.
The deal is expected to further enhance Aqua Consultants’ ability to tackle environmental challenges in the UK, including managing the effects of climate change and reducing pollution.
RES Environmental directors Mark Booker and Jason Drake said that Adler & Allan Group’s “capability and presence in the UK water sector, combined with our specialist expertise and experience, is a fantastic opportunity to broaden our customer offer, whilst further strengthening Aqua Consultants’ leading position in hydraulic modelling."
Aqua Consultants Managing Director Ben Shearer said that the acquisition builds on the company’s “previous investment in clean water modelling capability” and means that it is now “the market leader in highly specialised hydraulic modelling for both wastewater and freshwater in the UK.”
Shearer continued: "In addition, this capability will work in harmony with our broader group expertise in flow and level monitoring products and pollution remediation. At a broader skills level, this acquisition allows us to invest in maintaining these specialist skills in the UK water industry."
Adler & Allan Group has established itself as one of the UK’s leading environmental services groups, working with a wide range of public and private sector organisations to help them understand and manage environmental risks and reduce their environmental impact.
In the year ending September 30 2024, the group’s parent and holding company, Tet Midco Limited, reported turnover of £217 million, up from around £150 million a year previously, and EBITDA of slightly over £38 million, up from approximately £25 million the year prior.
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