If you manage a commercial building, an industrial facility, or any property with a cooling tower, summer is your busiest season and your highest-risk season at the same time.
The hotter it gets outside, the harder a cooling tower runs. More hours, more load, more strain on every component. Most cooling towers also come out of winter carrying months of buildup from sitting dormant or running at reduced capacity. That combination of heavy summer demand on a system that hasn't been properly cleaned is where most problems start.
Here is how you can get ahead of it before peak season starts.
What Happens Inside a Cooling Tower After a Long Winter
A cooling tower that sat through a New England winter, dormant or running at reduced capacity, is not in the same condition it was when you shut it down in the fall. Cold weather, low use, and months of exposure do a number on the inside of that system.
Scale and mineral deposits build up on internal surfaces every time water evaporates and leaves dissolved minerals behind. That buildup cuts into heat transfer efficiency. The system ends up running longer and working harder just to keep up. Going into a hot summer with that already in there, it compounds quickly.
On top of that, debris gets into the basin, the fill, and the air inlets all winter long. Dirt, organic matter, leaves, sediment, it all finds its way in when the system is sitting quiet. And once that stuff settles in, it creates exactly the kind of conditions where bacteria take hold.
That's the part that doesn't get talked about enough, and it's the most serious issue that comes with a cooling tower that hasn't been properly cleaned before summer.
Why Summer Is the Highest-Risk Season for Bacterial Growth in Cooling Towers
Legionella bacteria grow in warm water. Summer gives it everything it needs: higher temperatures, longer run times, and a system that's been sitting with months of organic debris built up inside it. That isn’t something you want going unchecked.
Cooling towers that go into summer without a proper cleaning and disinfection are the ones that end up with bacterial buildup problems. And once biofilm establishes itself on internal surfaces, routine chemical treatments alone don't cut it. It gets harder and more expensive to deal with the longer it sits.
Nobody wants to be the facility that gets flagged for a Legionella issue in August. The time to deal with it is before the system is running at full load through the hottest stretch of the year, not after an inspector shows up and makes the decision for you.
What Professional Cooling Tower Cleaning Actually Covers
Wiping down external surfaces is not cooling tower maintenance. A proper pre-summer cleaning and inspection includes:
-
Basin cleaning and flushing
Removing the sediment, debris, and biological buildup that accumulated at the bottom of the system over the off-season. -
Fill and drift eliminator inspection
The fill is where most of the heat transfer happens. If it's clogged or fouled, the whole system underperforms. Drift eliminators need to be clear and properly seated. - Fan and motor inspectionChecking for mechanical wear, proper alignment, lubrication, and any vibration issues that developed over winter.
- Water distribution check Making sure spray nozzles are clear, and water is distributing evenly across the fill. Uneven distribution means uneven cooling and accelerated wear on certain areas of the system.
- Full disinfection — a thorough treatment of the basin, fill, and all internal surfaces to eliminate bacterial risk before the system goes into heavy summer use.
At Mechanical Hygiene Services, our NADCA-certified team uses modern equipment and a proven process to get this done properly so your cooling tower is ready before peak season, not scrambling to catch up during it.
The Cost of Skipping Pre-Summer Cooling Tower Cleaning
Staying on top of routine maintenance means you catch small issues before they turn into something that shuts your facility down. An emergency call in the middle of July, when every technician from Boston to Providence is already booked solid, is going to cost you a lot more than getting it done in March or April when there's still room on the schedule.
And that's before you even get into compliance violations, health liability, or the operational headache of a system that goes down in the middle of a heat wave.
Pre-season maintenance is an investment.
