Wales Environmental, a South Wales, UK-based liquid waste management and drainage company, received £3.75m in financing.
Business Growth Fund made a £2m investment alongside an additional £1.75m of funding from HSBC.
The capital will be used to support the continued geographical expansion of the business across Wales and England.
Founded in 1980, Wales Environmental provides liquid waste removal and drainage services to commercial and domestic customers across Wales and the South West of England.
Led by Chief Executive Llyr Williams and Chairman Owen Sennitt, the business has recently expanded its presence with the acquisition of Cardiff Drain Cleaning Company, Drainology in Devon and Drains Direct in Deeside.
The business generates revenues close to £7m and employs more than 80 people.