How Does Legionella Get Into My Building?

How Does Legionella Get Into My Building?

Whether your building is newly constructed or even 100+ years old, chances are, sooner or later, it can become colonized with opportunistic premise plumbing pathogens (OPPP’s) such as Legionella. 

As facultative intracellular pathogens, meaning they are capable of living either inside or outside of other host cells, Legionella enters your building water system(s) as an endosymbiont of another organism.  Translated:  they hitch a ride into your building inside of amoeboid cells which, incidentally, function as their natural host organisms in the aquatic environment.

Where Should I Sample for Legionella?

Where Should I Sample for Legionella?

Should your Water Management Plan (WMP) Program Team decide to utilize environmental water sampling to validate the effectiveness of the WMP, ANSI/ASHRAE 188-2018 advises that these tests should be performed by a laboratory accredited to a nationally or internationally recognized standard (e.g., ISO/IEC 17025:2017), with Legionellaa included in the laboratory’s scope of accreditation.

Before environmental sampling is undertaken, a Sampling Plan should be formulated.  This plan should list the devices and Points of Use (POUs) to be sampled, at what frequency sampling will be performed, what the acceptable control limits will be, and what the response protocol will be for any sample result(s) falling outside of the previously-established control limits. 

Legionella Control Policy vs Water Management Plans

  • 19 November 2019
  • Author: Dominick Tuzzo
  • Number of views: 1372
  • 0 Comments
Legionella Control Policy vs Water Management Plans

We are often asked to review, audit, improve upon, or otherwise comment on Water Management Plans (WMP’s) consisting of no more than a few pages of boilerplate text which, in reality, are actually NOT Water Management ‘Plans’ at all.  Rather, they are simply Legionella control policies.

So, what’s the difference between a “Policy” and a “Plan”?

Policy (always a noun):  a course, principles, rules, guidelines, etc., proposed or formulated by an organization, government, business, or individual, typically published or promulgated throughout the organization, in order to direct organizational behavior towards (or away from) a particular goal, objective, or condition. 

My Building Water System Tested Positive for Legionella: Now What?

  • 23 July 2019
  • Author: Dominick Tuzzo
  • Number of views: 1839
  • 0 Comments
My Building Water System Tested Positive for Legionella: Now What?

We detected the presence of Legionella in one or more of our building water systems….. Now what do we do? This is probably the second most commonly asked question, surpassed only by:  “Do I have to test my water systems for Legionella?”  Often the question is posed this way:

“We recently performed Legionella testing on our building water systems and found one or more positive sample results.  What should we do about it?”

Legionella: To Sample, or Not To Sample?...That is the Question

What's required and what is my sampling plan?

Legionella: To Sample, or Not To Sample?...That is the Question

The simple answer is no (not directly), and here’s why:  There is no known safe level of Legionella in a building water system.  Therefore, even a non-detect sample result is not necessarily “safe.” The reason why is because the life cycle of this organism, coupled with the stresses put on it via temperature, disinfectants, etc. found within building water systems, may cause it to enter a viable but non-culturable (VBNC) state. 

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