How Do You Test For Legionella?

Book Appointment
See Services


Plumbing & heating specialists
Call us now

Subscribe to our newsletter for tips and industry news

An epidemic of Legionella can take place when water in plumbing lines or boiler is not tried tested frequently or appropriately due to ineffective plumbing service. When testing for legionella, there are an assortment of examining techniques, which can be used for this purpose. All of these tests have distinctive adequacy while deciding if the Legionella are in the water.

The culture method is one method for spotting legionella colonies on BCYE agar. However, this process for environmental water samples is usually not correct. This is because legionella colonies on BCYE agar media are every so often held back by rival microbial flora, which shows the existence of legionella colonies.

PCR or polymerase chain reaction method is another method that can be used to test Legionella. This method takes only a few hours and is suitable to screen drinking water samples. However, the problem with this method is that it does not work well with water samples, which are open to the environment. This is because of the dirt results in a high background, which shows the existence of legionella.

The direct fluorescent immunoassay method is the original “gold standard” way to quantitate legionella in both drinking water as well as environmental samples. This technique has become more precise and subtle by using monoclonal fluorescent antibody exact for numerous serogroups of L. pneumophila and numerous other legionella types, which result in the disease. The skill essential for this technique are not available in many legionella testing laboratories. Legionella testing laboratory uses two chief approaches to sample water, which are bottle and swab.

Swab sampling comprises accumulating a surface sample with a disinfected swab. This method is not much used as the spread of legionella is through single bacteria moving in an aerosol and swab samples do not allow quantification of legionella in the water creating an aerosol. Bottle bulk water sampling is much more common and involves taking water from clean water gears or mechanical apparatus comprising warm water. This method allows the quantification of the legionella per explicit water volume.

There are various methods available to test Legionella, however, it is better to take proper precautions to stay away from this disease. To reduce the risk of the disease, you should use the services of Bathroom Installation Milton Keynes, Tap Replacement Milton Keynes, and Toilet Replacement Milton Keynes, which will make sure that everything in your bathroom is spick and span and as good as new. For more information visit Grand Union Plumbing and heating!

Any questions?

If you are looking for a heating engineer within the Milton Keynes area for anything from boiler installations to fixing a tap, or would like some friendly advice please call Mitch directly today on 01908 034194

View more contact info

Areas we cover

  • Aylesbury
  • Bedford
  • Leighton Buzzard
  • Northampton
  • Olney
  • Towcester
  • Woburn Sands
Call us

What Our Customers Say

It’s not very often that you find a quality tradesperson who is reliable, honest, and competitive on his pricing. Mitch has done a number of jobs in our house, including installing a new boiler, water tank and radiators. All to a brilliant standard. I will happily recommend Mitch and Grand Union Plumbing!


Very happy with the service I have received, the service was prompt, efficient and professional. Yes, I would use again.

Clare Price

Amazing work and attention to detail and Mitch is a great person to work with

Made in Sud Pizzeria

Very friendly service. On-time and very professional. Also very careful about safety during the current COVID outbreak.

Andrew Robinson

Mitch is super friendly and professional, happy to give advice and he’s done loads of work for me.

G Man

Highly recommended, would use again

Mandi Willett

Highly recommend Mitch. Polite, professional, on time. Great service.

Susan B

Mitch replaced our boiler and ran new pipework, plus relocated some radiators. He did a brilliant job and I wouldn’t hesitate to recommend him! He was punctual, helpful and polite.

Suzanne Simmons

I had a new bathroom fitted by Mitch. He was absolutely excellent. He was polite, tidy and did an exceptional job. Reasonably priced too. 100% recommend.


Excellent service. I contacted them for a boiler repair. They responded within hours with prices. Once they confirmed part availability, they fitted within days.  Very efficient, great service and I liked their clear pricing.

Definitely recommend & I will be booking my annual service with them in future.

Well done!

Sheena Mac

Grand Union replaced our central heating system and in doing so we requested that it be relocated from the airing cupboard into the Garage.  The work was completed professionally & on time with the relocated pipework like a work of art, very neat and orderly.  I would have no issue with recommending Grand Union, and will certainly be using them for all our gas & plumbing needs.


I have called Mitch out twice since moving into our new house a month ago. Both times he has managed to fit in an appointment fairly quickly to resolve our issues. He has been professional and friendly, offering advice on other issues that I have seen. I would definitely recommend his services.

Simon Edwards

We have used Grand Union Plumbing several times as we had a really tricky fault. We found Mitch to be really excellent. Very happy to recommend, 10/10

Annette McDade

Called Mitch out on very short notice, extremely reliable and great rates, would highly recommend Grand Union Plumbing and Heating. Also provided advice with other queries aside from the job at hand- with no reluctance. Great service, thank you for your hard work and honesty Mitch.

Dushan Gnanakumar
Great service, polite, attention to detail. Would highly recommend.
Ajvinder Dhatt
Had a leak that needed fixing asap and Mitch gave me advice over the phone to deal with it until he could get to me, then came out within the hour on a weekend! Would highly recommend
Hannah Manners
Great company would highly recommend for any heating & plumbing issues
Terry Adolpho

Definitely recommend these guys. Had a job done by them and they wasted no time to get it done and made sure I was completely happy before any payments. Nowadays companies just want to rush and take your money. Big thumps up

Tevaugh Grant
We always use Grand Union for serving and any other unforseen problems. The service and professionalism is 1st class. Would definitely recommend!!
Stephanie Horne
A great company to do business with… I used them recently for an emergency with a domestic heating system which was rectified very efficiently. A second problem (some months later) and there was no decision to make, called them and they sorted it in no time with minimum fuss, mess and very reasonably priced.
Trevor Gordon

Have used Grand Union twice now. They are very quick to respond to enquiries, reasonably priced, tidy workers and very friendly. I can’t fault them. Definitely my go to guys now for any plumbing needs.
Highly recommended

Emma Verrall
Great service from Mitch. Have used a few times for boiler service, repairs and outdoor tap installation. Always very prompt service, turns up on time and reasonable prices. Would definitely recommend!
Jon Hood

I found Grand Union Plumbing through the Gas Safe Register. I had a boiler service and gas safety certificate. Mitchell was very professional and the prices were very reasonable. I would definitely recommend and use again.

Rebecca Hughes
Mitch was very helpful when fitting my new boiler – he was very fair about price and I couldn’t recommend Mitch enough. Thanks Mitch!
Reece Hussain


Use our calendar appointment request form and we will confirm back to you as soon as we can! We look forward to hearing from you.

Request appointment
Call us

Request a call back

If you have any questions regarding our services, would like to arrange a quotation or would like to book a call out please contact us using the form below. You can also request an appointment through our contact form. We look forward to hearing from you!