What Should the Outcomes of an Interceptor Service Be?

As part of your Planned Preventative Maintenance (PPM) schedule, you should regularly service your drains and interceptors (you can read more about why you should here).  There are many different suppliers you can choose from, but what should you expect in terms of outcomes?  This is what we will discuss in this blog.

Full Service

It is important that your service covers all of your site interceptors and is completed to a high standard so that your interceptor maintains its purpose for pollution control.  At a minimum, your interceptor service should include:

  • A regular check for silt and oil accumulation
  • A thorough visual inspection for any issues or faults
  • An inspection of all mechanical parts associated with the interceptor

If your inspection indicates so, you should empty your interceptor of oil and/ or silt that has accumulated there.  You must make sure that anything removed from your interceptor is disposed of correctly as a waste and dealt with as hazardous if it is contaminated by oil.

Integrity Testing

Every five years, your interceptor should be tested for integrity (read more about this here).  This involves the emptying of your interceptor and a full check of it to identify any issues or problems.  Any issues should be dealt with as a priority as your interceptor will not be providing pollution control and could be causing pollution itself.  If everything is fine with your interceptor, it should be filled back up with clean water to continue to function.


A full and comprehensive interceptor service should be followed by an informative report.  Some contractors will only provide you with an email confirming that they have visited your site, but this will not fully inform you of your site arrangements and potential risks.  A comprehensive report should:

  • Detail the scope of works carried out – whether it was limited to an inspection or whether waste was removed or if an integrity test was carried out
  • Identify the current condition of your site interceptors
  • Recommend any further works required e.g. if the interceptor does require emptying
  • Include any additional issues with drainage or the surrounding area
  • Prove attendance, usually through photos
  • Highlight any missed interceptors and the reasons why e.g. not accessible

Your report should allow you to make management decisions regarding the state of your interceptors and any additional works that are required.  A good report is also useful when proving maintenance of pollution controls during audits and showing purpose value for money when considering PPM budgets.

Interceptors should be regularly serviced, usually every 6 months.  Your service should be comprehensive and include all of your site interceptors.  When a service has been completed, a clear and full report will provide a service history of your interceptors and provide management information, so you can make a clear decision on interceptor management going forward.