Mantair Ltd - Experts in Septic Tank & Sewage Treatment Solutions

Since 1987, Mantair Ltd has been providing trusted, compliant, and environmentally responsible wastewater treatment solutions across the UK. From our roots as a family-run business to becoming one of the UK’s leading independent specialists, our mission has remained the same - putting our customers first and delivering systems that work for their site, budget, and long-term needs.

We understand that managing wastewater infrastructure - whether on a rural estate, at a heritage site, or for a community facility - can be complex. Regulations, environmental sensitivities, and operational requirements all need to be balanced. That’s why we take the time to listen, explain options clearly, and design bespoke solutions that meet both legislative standards and practical demands.

Experience Across Diverse and Sensitive Environments
Our work spans rural developments, conservation areas, commercial facilities, listed buildings, and visitor attractions. We have delivered projects for respected organisations such as the RSPB, National Trust, Milton Estates, Bressingham Steam Museum, Cory Group, and Morgan Sindall. We are trusted to work in sensitive, regulated locations because we understand how to operate with minimal disruption, preserve heritage, and protect the environment.

Full-Service, End-to-End Delivery
With many of our in-house team each having over 25 years’ experience, we personally take care of every stage of your project. From the very first site survey, we handle all the details - liaising with the Environment Agency to secure permits, working with local planning authorities to ensure compliance, managing reinstatement, and providing ongoing maintenance. We provide a single point of contact from start to finish, making the process simpler, faster, and more transparent. Our in-depth knowledge of the General Binding Rules and Environment Agency permit process means we can guide your project smoothly through even the most highly regulated and environmentally sensitive locations.

Overcoming Complex Site Challenges
We’re used to tackling projects where standard solutions won’t work. From narrow rural roads and sensitive wildlife habitats to tight industrial sites and complex excavations, we adapt our methods to fit the environment. We’ve worked around sensitive wildlife habitats, and kept visitor centres and 24/7 facilities running without disruption. Whatever the challenge - restricted access, strict safety requirements, or intricate system changeovers - we find a way to deliver, keeping safety, compliance, and our clients’ needs at the heart of every project.

Accreditations That Assure Quality and Safety
Mantair Ltd holds CHAS Elite accreditation and is a member of both British Water and the National Association of Drainage Contractors (NADC). We are approved installers for multiple leading manufacturers, and our operations are protected by Cyber Essentials certification. These credentials mean our clients can trust us to deliver projects to the highest standards of safety, quality, and compliance.

The Mantair Conversion Unit: A Flagship Innovation
We are proud to have designed and manufactured the Mantair Conversion Unit - a solution that transforms existing septic tanks and cesspools into fully compliant sewage treatment systems without the need for full excavation. Accepted by the Environment Agency for discharge to natural watercourses under Permit certification, the conversion unit is Made in Britain certified. The product provides a cost-effective, low-disruption alternative for sites where space, heritage, or environmental considerations make replacement impractical.

Your Partner in Wastewater Solutions
At Mantair, we don’t just install systems - we build lasting relationships. Our approach is collaborative, transparent, and focused on making the process straightforward for our clients. Whether upgrading non-compliant systems, supporting new developments, or enhancing facilities in sensitive locations, we deliver wastewater solutions that are reliable, efficient, and environmentally sound.

Want to find out more?
We’d love to hear from you.

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