We are a leading UK manufacturer of innovative polyethylene storage tanks and systems with 40 years experience. Our diverse and innovative product range includes wastewater treatment systems, pump stations, heating oil tanks, diesel tanks, rainwater harvesting systems, hot water storage tanks and a range of other products. While the company’s services and operations have expanded, the underlying principles of our family-owned business have remained constant. We are one of the fastest growing manufacturing companies in Northern Ireland with over 100 employees. Exceptional customer service is at heart of our business; supplying quality products within a trusted and professional service. We have a number of internationally recognised management system certifications including ISO 9001, 14001 and 45001. Harlequin is a member of OFTEC, the British Water Association and the National Association of Drainage Contractors (NADC).