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

• "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

• I just wanted to drop you a message to thank you for your work. Your determination to sort out someone else’s mistake was outstanding. Your commitment and tenacity are a real credit to Shanahans, and I really look forward to working with you in the future.

  Matt -  Regional Maintenance Manager 

• Today believe it or not I had the privilege of having my sceptic tank emptied by a Clive from Shanahan’s Strange as it may sound as it’s not a procedure I warm to but in this case it was a necessity! Firstly initial contact with the company who immediately recognised my dilemma and gave me the next available appointment at 7.30am the next day Then on time came CLIVE huge tanker and all, down our narrow drive. Twice he had to reverse some 60 yard to let neighbours get to work and an to an emergency dental appointment Once set up he emptied the tank only to find the soil pipe was blocked, to cut a long story short he sucked, blew, sucked again and eventually power jetted the blockage away (mechanically) that is staying nearly an hour in the process In this day and age people are quick to moan and complain and seldom, give praise but rest assured in Clive you have a real gem. Nothing is too much trouble. Amazon always ask How was your delivery? How many stars, was it on time, respect of property etc etc, but NEVER have I ticked the above and beyond but with Clive that box if there was such a box I would tick it. Well done and a big thank you to Clive

  Richard Aston - Hertfordshire