Scottish technology company CSignum has raised £2.6mn to expand production of wireless systems capable of transmitting data through water and the ground, as it seeks to capitalise on tougher environmental monitoring requirements.
The Bathgate-based company said the funding would be used to increase manufacturing and accelerate commercial deployment of its EM2 technology, which uses electromagnetic signals to connect sensors in environments where conventional wireless communications struggle to operate.
The round was backed by existing investors including Archangels, PXN Ventures and Scottish Enterprise, alongside the British Business Bank and US-based angel investors.
CSignum raised £6mn in a Series A round in April 2025, led by Archangels, Par Equity and Scottish Enterprise. Since then, the company said it had progressed from pilot projects to larger deployments with several UK water utilities as well as international customers.
Demand is being supported by tighter monitoring requirements for England’s water industry. Section 82 of the Environment Act 2021 requires sewerage companies to continuously monitor water quality upstream and downstream of discharges from storm overflows and sewage treatment works.
Water companies have begun installing continuous water quality monitors during the current 2025-30 investment period, known as AMP8, with regulators prioritising higher-risk sites. The systems measure indicators including ammonia, dissolved oxygen, temperature, pH and turbidity.
CSignum is also targeting markets beyond the UK water sector. It is involved in a “smart buoy” project in the Gulf of Mexico, has conducted pilots with two US water monitoring organisations and is supplying through-ground sensing technology for an infrastructure project in Asia.
The fundraising coincides with a change of leadership. John Nicholls has been appointed chief executive, replacing Jonathan Reeves, who will become chief strategy officer.
Nicholls said his priority was turning the company’s technology and existing customer relationships into “large-scale deployments”.
Dan McKiddie, investment manager at Archangels, said CSignum was beginning to demonstrate the potential of its technology in established markets.
The latest investment takes the funding announced by CSignum since April 2025 to £8.6mn as it attempts to establish its technology across water, infrastructure and other hard-to-connect industrial environments.
