For many swimmers, the same doubt pops up the first time they put on a sensor: Can you swim with a CGM?

Let’s be honest - these expensive little electronic devices stuck to your skin look like they and water would be natural enemies.

As a professional who has spent over 7 years researching the CGM field, I’ve seen this technology evolve rapidly. Today’s mainstream sensors aren't just built for your morning shower.

They can even handle a session out in the surf.

However, knowing that you can be swimming with a cgm doesn't mean you should be reckless with it.

Based on real-world user feedback, signal drops and adhesive peeling are the most common headaches for swimmers.

This article dives deep into the waterproof limits of major brands and shares pro tips on how to protect your sensor so you can hit the water with confidence.

Introduction

If you are asking “can you swim with a CGM sensor”, the short answer is: Yes! In fact, most modern devices are designed with water resistance in mind from the very beginning.

Mainstream products currently on the market - such as SIBIONICS, Dexcom G-Series, and Abbott’s FreeStyle Libre - all boast high-spec waterproof ratings.

But there is a catch. While the device itself is waterproof, the environment (depth, duration, and temperature) and the impact of water on the adhesive are critical to your experience.

If handled incorrectly, you risk the sensor falling off prematurely or getting "sensor error" readings. Before we get into the best practices, let’s look at how the big brands stack up.

Understanding Waterproof Limits by Brand

Not all sensors are created equal when it comes to depth and duration. Knowing the specific limits of your CGM device is essential before you dive in.

Here is a comparison table based on official manufacturer specifications:

CGM Model	Waterproof Rating	Max Depth (Official)	Max Duration (Official)
SIBIONICS GS3	IP38	~3 feet (1 meter)	Up to 1 hour
FreeStyle Libre 2 & 3	IP27	~3 feet (1 meter)	Up to 30 minutes
Dexcom G6	IP28	8 feet (2.4 meters)	Up to 24 hours
Dexcom G7	IP28	8 feet (2.4 meters)	Up to 24 hours

SIBIONICS GS3

The SIBIONICS sensor is designed with active lifestyles in mind.

According to official data, the GS3 model carries an IP38 waterproof rating.

This means users can practice swimming with cgm at depths of about 3 feet (1 meter) for up to 1 hour. This is more than enough for most casual swimmers and fitness enthusiasts.

FreeStyle Libre 3 Water Resistance

Abbott’s FreeStyle Libre series is one of the most widely used CGM systems globally.

Official documentation states the FreeStyle Libre 3 sensor can withstand immersion in 3 feet (1 meter) of water for up to 30 minutes.

While it performs great for short dips or showers, it may not be the best choice for long-distance open-water swimming without extra protection.

Dexcom G6 & G7 Waterproof Specs

Dexcom G6 and G7 sensors feature very robust housings.

They are officially rated to stay submerged in 8 feet (2.4 meters) of water for up to 24 hours - fantastic news for divers and long-distance swimmers.

Why Your CGM Might Stop Showing Readings Underwater?

It can be startling to realize that as soon as you submerge, your phone or receiver shows a "Signal Loss" alert.

Don't panic. Your sensor probably isn't broken. Can i swim with my cgm sensor and see my glucose levels in real-time? Usually, the answer is no.

This happens because CGM sensors communicate via Bluetooth.

Physics tells us that the 2.4GHz radio waves used by Bluetooth are terrible at penetrating water and the signal weakens almost instantly.

When a layer of water sits between your body and the receiver, the signal simply can't get through.

The good news is that most CGM devices have built-in memory. 

Once you leave the water, the sensor will automatically reconnect and backfill the data you missed while swimming.

How to Protect Your CGM While Swimming: 5 Essential Tips

To ensure your device stays "pool-proof," taking a few extra precautions is a game-changer.

We recommend that you take measures to protect the product from water exposure before swimming.

It helps keep the sensor dry, prevents it from becoming dislodged, and reduces the risk of infection or inaccurate readings caused by water ingress.

Here is how to protect cgm while swimming based on the experiences of T1D and T2D athletes.

#1 Use Medical-Grade Overpatches

This is the single most effective way to keep your sensor safe.

There are many waterproof patches designed specifically for CGM devices, such as the popular Skin Grip.

These use medical-grade adhesive to cover the sensor and provide a tight seal, preventing the edges from lifting.

#2 Apply Liquid Adhesives

If you sweat heavily or have oily skin, the original adhesive might not be enough.

Before applying a new sensor, use a liquid adhesive "tack" or skin prep. This creates a sticky barrier that ensures the sensor stays glued to your skin even after a long soak.

#3 Timing Your Swim

This is a detail many people overlook: Timing is everything.

I strongly recommend avoiding swimming with a cgm for the first 1–2 hours after applying a new sensor.

The adhesive needs time to fully "set" and bond with your skin. If you jump in right away, the bond will be weakened, likely leading to the sensor falling off days early.

#4 Saltwater vs. Chlorine Considerations

Saltwater and chlorine affect adhesives differently.

Salt forms tiny crystals as it dries, which can act like sandpaper on the adhesive. Chlorine, on the other hand, is a harsh chemical that can break down the glue.

Always rinse your sensor area with fresh water immediately after a swim to wash away these residues.

#5 Placement Matters

Where you put the sensor dictates the amount of "drag" or water resistance it faces.

When swimming with cgm, try to choose a flat area on the back of the arm with minimal muscle movement.

Avoid placing it near the armpit or on the outer arm where it might rub against lane lines or your swimsuit.

Post-Swim Care: Ensuring Sensor Longevity

What you do after getting out of the pool is just as important as what you do inside it.

First, use a clean towel to gently pat dry the CGM sensor and the surrounding area. Never rub it vigorously!

Water softens the adhesive, and rubbing it while wet is the easiest way to make the edges peel.

If you have a hair dryer, using the "cool" setting to dry the edges is a pro move.

Next, check the edges for any lifting.

If you see a small peel, you can trim the loose bit and apply a fresh overpatch immediately to secure it.

If a sensor does fall off in the water, do not try to tape it back on. Once the adhesive fails and the sensor is compromised, the data accuracy cannot be guaranteed.

According to professional guidelines from the Cleveland Clinic, sensors lost during vigorous activity should be replaced, and you should contact the manufacturer for a possible replacement.

Conclusion: Dive In with Confidence

So, can you swim with a cgm device? Absolutely.

The whole point of a CGM is to give you more freedom, not to act as a leash on your lifestyle.

As long as you understand your device’s waterproof limits and use tools like overpatches for extra security, you can enjoy the water however you like.

Modern technology is here to help us take control of our health. Whether you're doing laps in a heated pool or exploring the ocean, take your CGM and dive in!

Disclaimer: This article is for educational purposes only and does not replace medical advice. According to Cleveland Clinic, while CGMs are durable, your individual health needs should always be discussed with your healthcare provider.