Our Affiliates

At W.J. Hatt, we work closely with a selection of long-standing partners – including Harlequin, Marsh & Klargester – to provide reliable, sustainable water and wastewater solutions. Below is an overview of our key affiliates and how they support our work.

claydon environmental ltd
  • Claydon Environmental is a leading environmental consulting firm with over 35 years of experience helping businesses & individuals achieve compliance with current legislation.
  • Services: environmental compliance, sustainability reporting, project management and green procurement.
  • How we work with them: Claydon Environmental advises us on our wastewater management projects, ensuring foul drainage systems are compliant, efficient and environmentally sustainable in the long term.
HARLEQUIN
  • Harlequin Manufacturing is a Northern Ireland-based family business that has now expanded to East Kirkby with a new state-of-the-art manufacturing facility.
  • Products: wastewater treatment plants, rainwater harvesting systems and hot water storage systems.
  • How we work with them: We use Harlequin products in our foul drainage systems for domestic, commercial and agricultural projects.
MARSH INDUSTRIES
  • Marsh is a family-owned manufacturer catering to domestic, commercial and agricultural sectors from their two UK manufacturing plants.
  • Products: sewage treatment plants, septic tanks, grease traps, pumping stations and surface water solutions.
  • How we work with them: We use Marsh products in our foul drainage systems, providing long-term, reliable solutions for clients.
KLARGESTEr (A Kingspan Company)
  • Klargester has been pioneering UK water & wastewater management solutions since 1965, including domestic & commercial sewage treatment plants, rainwater harvesting systems and pumping stations.
  • How we work with them: While we now recommend Harlequin or Marsh systems, our team is experienced with Klargester installations and can advise on maintenance, upgrades or suitable alternatives.
  • Our knowledge of Klargester products also means we can provide informed advice when replacing older Klargester systems with modern alternatives.
Allsebrook Pumps
  • Allsebrook are specialists in installing & commissioning both clean water & wastewater pumping systems, with 150+ years industry experience.
  • They also offer service & maintenance packages for existing pumps & foul drainage systems.
  • How we work with them: We use Allsebrook’s equipment & expertise for our storm drainage systems, water schemes and water features – including pumps, wellheads, boreholes, rainwater harvesting and storm drainage – ensuring systems run reliably over time.
ROCHESTER MIDLAND CORPORATION (RMC, PREVIOUSLY EATON ENVIRONMENTAL)
  • RMC (Rochester Midland Corp.) are experts in water treatment, filtration and contamination control.
  • They offer testing on ageing underground pipe networks for particulates (normally rust) & bacterial agents that may contaminate private water systems.
  • How we work with them: We use RMC whenever water sampling is required for for any water system installations, and for UV/chemical treatment to ensure new & existing systems are safe & compliant.
HD Services Ltd
  • HD Services is a Buckinghamshire-based family business specialising in borehole creation & renovation and renewable heating systems.
  • They offer a one-stop solution – design, installation, commissioning & servicing – and are fully accredited (ISO 9001 / 14001).
  • How we work with them: We partner with them for borehole projects to ensure reliable and compliant water supply systems.