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

Our other services

Testimonials

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  • “Shanahan’s has looked after our domestic property for years now. We have always had excellent ,friendly service. An unexpected onsite problem which occurred during their last visit was investigated, reported on and resolved promptly. I know I can rely on their expertise. I would not hesitate to recommend this company to others.

    Caroline - Radlett

  • I just wanted to say what a fantastic service we had yesterday. The gentleman that came to empty the tank negotiated the well and narrow driveway brilliantly!

    And the drain survey team were equally fantastic! Courteous and really helpful; involving us (we were both very curious!) as much as we wanted!

    What a brilliant team to have come to our property! We will most certainly be coming back to you for any future needs.

    Thank you.

    Esther - Hertfordshire

  • "The guys at Shanahan are great. They are friendly, knowledgeable and professional. A special shout out to Michael for his no-fuss attitude, who gets the job done quickly and professionally without any fuss. Would definitely recommend."

    Anthony - Hitchin

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