Our services

We provide a complete range of sewage treatment plant services, including:

• STP design and installation – bespoke systems tailored to property size, soil conditions, and wastewater requirements.
• Routine emptying and servicing – keeping systems operating smoothly and preventing blockages or mechanical failures.
• Maintenance and inspections – professional checks to ensure regulatory compliance and reliable operation.
• Repairs and troubleshooting – addressing issues quickly to prevent overflows or operational failures.

All work is carried out by skilled engineers using modern equipment, ensuring long-lasting and dependable performance.

Installation process

Our sewage treatment plant installation process is carefully managed from start to finish:

• Site assessment – evaluating soil, wastewater volume, and property requirements to select the most suitable STP type and capacity.
• Layout design – planning the tank, pipework, and drainage field or discharge point to meet environmental and planning regulations.
• Excavation and installation – preparing the site, installing the system, connecting all components, and conducting thorough testing.
• Handover and guidance – ensuring the STP operates correctly and providing advice for ongoing care and maintenance.

Who we work with

Our sewage treatment plant services support:

• Domestic homeowners and rural properties
• Commercial sites and businesses

Learn more about the sectors we serve [link to dedicated sectors page].

Need a sewage treatment plant installed or serviced? Contact Shanahan Contracting Ltd today to discuss your requirements or request a site visit.

Request a quote for Sewage treatment plant installation & servicing

• To empty Septic tanks . First class service from first contact to removal within 24 hours . Very knowledgable , helpful company . Would highly recommend .

  Julie - Hertfordshire

• “Shanahan’s has taken care of all our drain cleansing, jetting & repairs for over 10 years, also assisting us with any groundworks we need. They always provide a prompt & professional service. The teams knowledge of our site pays dividends & their experience helps to keep the centre’s complex drainage network running”

  Jack Garden Square Shopping Centre - Letchworth

• Just a quick thank you for your help in sorting our drainage issue and for the outstanding service provided by Michael yesterday, he is a real credit to your business.

  Standalone Farm - Letchworth