If you've already been looking into how to test for legionella in water , you're likely concerned regarding the safety associated with your building's plumbing related or perhaps a cooling system that will hasn't been utilized in a whilst. It's one of those things that doesn't cross your own mind until you listen to a report about a good outbreak or you're reopening a real estate after a long vacancy. The great news is that while the bacteria sound intimidating, the tests process is in fact pretty straightforward once you know exactly what you're looking for.
Legionella isn't some rare, exotic pathogen; it's actually found naturally in many freshwater conditions. The trouble starts whenever it hitches a ride into our man-made water techniques. Once it's within a warm tube or an at standstill tank, it may multiply often. When those bacteria get misted into the atmosphere through a showerhead or an Air conditioner and someone breathes them in, that's when you operate into real wellness risks.
Why you ought to care about screening
It's simple to assume that will because your water looks clear and smells fine, it's totally safe. But Legionella is unseen, and it doesn't change the taste of your water. You really won't know it's there unless you look for it. Usually, the biggest risks are in places where water sits still for quite a long time. Think about a guest bathroom that nobody uses, or a vacation home that's already been shuttered for the particular winter.
Another big factor is usually temperature. Legionella absolutely loves lukewarm water—specifically between 77°F and 113°F. If your water heater isn't established high enough, or if your cold water lines are getting warmed up by nearby heating plumbing, you're basically working a resort for bacteria. Testing gives you a baseline so you aren't just guessing about the particular safety of your shoes.
The two main ways to test
When you're figuring out how to test for legionella in water , you'll generally encounter two different strategies. Both have their own place, but they tell you slightly different things.
First, there's the Lifestyle Test . This particular is the old-school, gold-standard method. A lab takes your own water sample, describes on a petri dish, and waits to see in the event that anything grows. The big advantage here is that it only counts live bacteria. If this grows, it's a threat. The downside? It takes about ten to 14 times to get a good answer because, well, biology takes time.
The 2nd choice is the PCR Test (Polymerase Chain Reaction) . This will be the high-tech version that looks for the DNA of the bacteria. It's incredibly fast—you can often get results in a day or two. However, it's almost too good at the job. It will certainly pick up DNA from dead germs too, which might offer you a "false positive" in terms of actual risk. When you've recently treated your pipes with chlorine, a PCR test might still show positive actually though the threat is gone.
Step-by-step: Doing it yourself
In the event that you aren't finding a professional consultant, you'll probably be using a DIY sampling kit that you simply deliver off to the lab. It's not hard, but you have to end up being precise so you don't contaminate the sample with stuff from your fingers.
- Get the right kit: Don't just use an arbitrary water bottle. Order a particular Legionella assessment kit. These come with sterilized bottles that often include a tiny amount of powder (sodium thiosulfate) to neutralize any kind of chlorine in the particular water so the bacteria don't die on the method to the laboratory.
- Choose your spots: You want to test the particular areas where the particular risk is maximum. This usually indicates the "distal points"—the taps or showers furthest away from the water heater or the main consumption.
- The "First Draw" versus. "Post-Flush": This is a big one. For Legionella, you desire a "first draw" sample. This indicates you haven't run the water for many hours (or overnight). This captures the bacteria that have got been sitting right at the faucet head.
- Fill up the bottle: Put upon some gloves, open up the bottle carefully, and fill it to the range. Don't allow the edge of the container touch the faucet.
- Label and ship: This noises obvious, but take note of exactly where the particular sample came from. Then, have it in the mail mainly because fast as possible. Most labs would like the sample inside 24 to forty eight hours for the most accurate outcomes.
Decoding the lab results
Once you obtain that email back in the lab, this might look like a group of gibberish. You'll likely see the number followed by CFU/L . That appears for "Colony Forming Units per Liter. "
Fundamentally, this informs you the concentration of the bacterias. If the number is low (like under 10 or even 100 CFU/L, based on the system), you're generally in the apparent, though you should still keep up with maintenance. When the number is high—say, over 1, 000 CFU/L—that's a red flag. At that point, the lab or a local health expert will likely tell you it's time to take action.
Don't panic in case you see a tiny amount. Remember, Legionella exists in character. The goal isn't always "zero" (though that's nice); the particular goal is maintaining the levels reduced enough that they will don't pose a risk to individuals breathing in the steam.
How often do you really need to test?
Generally there isn't an one-size-fits-all answer here, but there are several good guidelines. When you're a house owner, you probably don't need to test every month unless of course you have a particular reason to end up being worried, like the complex well system or an outdated solar water heater that doesn't obtain very hot.
However, if a person manage a commercial building, a gym, or an house complex, you have to be tests more regularly—maybe quarterly or twice a year. You definitely want to test if: * The particular building has been empty for a while. * You've just done major plumbing work. * The water temperature continues to be fluctuating. * There's been a water main break in your area.
It's all about risk management. The greater individuals using the water, the more important it really is to have got a paper trek showing that you're keeping things secure.
What to do if the results are bad
So, you followed the steps upon how to test for legionella in water and the results came back positive. Right now what? First off, don't let anybody use the showers or even any equipment that creates an air (like decorative fountains).
The nearly all common fix is usually a "thermal shock. " This requires cranking your water heater up to a minimum of 158°F (70°C) and flushing every single single tap in the house for about 20 to 30 minutes. Be extremely careful here—water that hot will scald you in a split minute.
When the cold weather shock doesn't function, you might require to look into chemical disinfection, like a heavy chlorine treatment. This will be usually where you'd call in a professional plumber or even a water treatment professional. They have the particular gear to inject chemicals safely with no ruining your piping.
Keeping it clean for the long haul
Testing is great, but prevention is usually even better. The best way to avoid a bad test result is to keep your water relocating and keep it warm. If you have a visitor room, run the particular shower for the few minutes as soon as a week. For those who have a hot bathtub, keep your chemicals well balanced.
At the end of the particular day, knowing how to test for legionella in water is simply a part of being a responsible property owner. This takes a little bit of hard work and a several dollars for the lab fee, yet the peace of mind you obtain through knowing your water is safe will be well worth this. Plus, it's much easier to offer with a little bacterial issue right now than a full-blown health crisis later. Remain safe, keep the particular water flowing, and don't be afraid to check under the cover of your domestic plumbing every once in a while.