Advice on testing a building water system
Where to sample, what culture tells you, what a water management plan has to contain, and which questions belong to a doctor. Three new articles a week.
Latest · October 28, 2026 · 5 min
Legionella and shower heads: why the last few inches of pipe get so much attention
A shower head turns water into fine droplets, sits partly drained between uses, and grows biofilm. That is why it comes up in almost every program, and why a rarely used one matters more than a busy one.
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October 25, 2026 · 6 min
Legionella in water heaters and storage tanks: where the conditions concentrate
A storage tank is warm water held still, often with sediment at the bottom. That combination is why heaters and tanks appear in every water management program.
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October 22, 2026 · 5 min
What does legionella look like in water? Nothing you can see
People search for a color, a smell or a film. There is none that tells you legionella is present, and the useful answer is what to watch instead.
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October 19, 2026 · 6 min
How legionella gets into building water, and why the supply is rarely the whole story
Low numbers of legionella can arrive with ordinary supply water. What decides whether that matters is what the building does with the water once it is inside.
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October 16, 2026 · 6 min
Dead legs in plumbing: causes, Legionella risk and what to do
Dead legs in plumbing are pipes where water no longer moves. What causes them, why they raise Legionella risk, how to find them, and when to remove or flush.
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October 13, 2026 · 7 min
ELITE enrolment and accreditation: how to check a legionella laboratory
Two different things, routinely presented as one. A laboratory can hold either without the other, and knowing which is which is the whole of choosing well.
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October 9, 2026 · 8 min
Where legionella testing requirements come from, and why there is no national answer
Searches for legionella testing requirements have roughly doubled in six months. The honest answer is that there is no single United States rule, and any page that states one is describing somewhere in particular without telling you where.
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October 6, 2026 · 8 min
ASHRAE 188: what the standard asks of a building, in plain terms
The standard is bought, not summarised, and this page does not reproduce it. What it does is describe the shape of what it asks for, so that a building owner can tell whether the work has been done.
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October 2, 2026 · 7 min
Cooling tower legionella testing requirements: where they come from, and what a tower program looks like
There is no single national rule for testing a cooling tower, and any page that states one is describing somewhere in particular. Here is where a requirement can come from, and what a program built on it contains.
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September 30, 2026 · 7 min
Legionella testing companies: how to judge one on paper before you hire
How to judge a legionella testing company on paper before you hire one: what to ask for, what the answer should look like, whoever is quoting.
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September 28, 2026 · 6 min
How to compare two legionella testing quotes that look nothing alike
Two quotes for the same building, far apart, and no obvious way to tell which is serious. The gap is almost never the unit price. Here is how to put both on the same footing and read what each one is really proposing.
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September 25, 2026 · 7 min
A water management program for healthcare facilities: what is different inside a hospital
Water in a hospital or care facility: the same program shape as anywhere else, plus a priority map, a surveyor, and a file that has to speak for itself.
Read it→September 23, 2026 · 7 min
A legionella water management program in operation: what running one actually involves
The article of 10 August described the document. This one describes the weeks after it is signed: who reads the log, who acts on it, and what the sampling is for.
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September 21, 2026 · 7 min
Water sampling for legionella: how a sample is taken so the result means something
Most of what decides a legionella result happens before the bottle reaches the lab. How a water sample is taken, and what it must carry to mean something.
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September 18, 2026 · 6 min
The cooling tower cleaning process, and the two points where sampling belongs
The cooling tower cleaning process in order, described by the trade that measures the outcome, with the two points where a sample belongs on either side.
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September 16, 2026 · 6 min
Cooling tower basin cleaning: what sits at the bottom, and how to measure it
What collects at the bottom of a cooling tower basin, why it matters for legionella, and how sampling before and after a clean shows what the work changed.
Read it→September 14, 2026 · 6 min
Cooling tower cleaning chemicals: what they do, and what proves they worked
What cooling tower cleaning chemicals do, the categories without brand names, and what proves they worked. Written by people who sell no chemicals at all.
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September 11, 2026 · 7 min
Commercial water testing: what is actually being tested, and for what
One term covers three different purchases, from a chemistry panel on the incoming main to a microbial survey of a whole building. Knowing which one you need is most of the buying decision.
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September 9, 2026 · 6 min
Cooling tower cleaning: what it changes in a sampling result
About to pay for a cooling tower clean? What a physical clean removes, what it cannot remove, and how the difference shows up on a laboratory report.
Read it→September 7, 2026 · 7 min
Cooling tower cleaning services: how to buy one, and how to prove it worked
Cleaning a tower is one trade and testing it is another. A sample before and after is how a facility finds out whether the cleaning it just paid for actually changed anything.
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August 21, 2026 · 6 min
Legionella risk assessment services: what you are actually buying
What a legionella risk assessment service actually consists of, how this work is usually sold, and the six questions to ask before you pay for one.
Read it→August 19, 2026 · 6 min
A legionella risk assessment template: what it captures, and the one thing it cannot
A risk assessment template is useful, but it cannot hold the hard part of the job: knowing the pipework the form describes. What it captures, and what not.
Read it→August 17, 2026 · 7 min
What a legionella risk assessment covers in a US building
The phrase has a precise legal meaning in another country and a looser one here. Sorting that out is the first job, because most of what ranks for it is written for the wrong jurisdiction.
Read it→August 13, 2026 · 6 min
Hot tubs and spa pools: why they come up so often, and what to do about a domestic one
Why hot tubs come up so often with legionella, the honest answer for a home hot tub, and where commercial spa pools in hotels and gyms are different.
Read it→August 10, 2026 · 7 min
What a water management plan has to contain to be worth having
Most buildings own a water management plan and few operate it. What the plan has to contain, and how to tell a working plan from a binder on a shelf.
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August 8, 2026 · 7 min
Where to sample in a building, and why the location decides the result
Choosing outlets is the whole test. A well-run laboratory analyzing the wrong twelve taps produces twelve precise numbers about nothing.
Read it→August 6, 2026 · 4 min
If you are looking for a diagnosis, this is the wrong website
If you searched for legionella disease testing, you may need a doctor, not a water sampler. Here is the difference, said plainly.
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August 3, 2026 · 6 min
Test kits versus laboratory culture: what the difference actually costs you
A kit is not a cheap version of a laboratory test. It answers a different question, and the competition on this search term tells you who benefits from the confusion.
Read it→August 1, 2026 · 7 min
Cooling tower water treatment and legionella: two programs that have to agree
The chemistry program and the legionella program are usually run by different people to different targets. Where they disagree is where towers go wrong.
Read it→July 30, 2026 · 7 min
What a legionella test tells you, and what it does not
A result is a count from one tap at one moment. Understanding how narrow that is turns a number into information.
Read it→Sampling planned against your schematic
Four questions, then a call. Temperatures and treatment records should be read rather than remembered.
Free to ask, no obligation.