CGM Waterproof Ratings: What You Need To Know?
Are CGM Devices Waterproof? The Short Answer
Many users who buy or consider a CGM often ask: are cgm waterproof? The short answer is that most modern CGM sensors offer some degree of water resistance, but specifications vary significantly across brands and models.
Diabetes UK notes that "most CGM sensors are water resistant, however, it's still best to check the manufacturer's specific guidelines on bathing, showering and swimming" [1].
This means there is no universal waterproof standard that applies to all CGM devices — each model needs to be verified individually.
When choosing a SIBIONICS or another CGM brand, understanding the distinction between "water-resistant" and "waterproof" is especially important.
Water-resistant means the device can resist water ingress under limited conditions, while waterproof typically indicates it can withstand continuous use at greater depths.
When evaluating the is cgm waterproof capability of a device, the IP (Ingress Protection) rating system is the most widely recognised international reference standard, defined under IEC 60529.
Checking a device's IP rating before purchasing is an important step in making an informed choice.
What Does A CGM Waterproof Rating Mean?
The IP (Ingress Protection) rating is a two-digit code defined by the International Electrotechnical Commission under IEC 60529. The first digit indicates protection against solid particles, while the second digit indicates protection against liquids.
When understanding the cgm waterproof rating, the second digit — covering liquid protection — is the most relevant. Common liquid protection ratings for CGM devices are as follows:
Digit 7 means the device can be temporarily submerged in water up to 1 metre deep for a maximum of 30 minutes without water ingress, making it suitable for everyday showering and shallow water swimming.
Digit 8 means the device can be continuously submerged under manufacturer-specified conditions, typically beyond the 30-minute limit, making it suitable for longer water activities.
For cgm waterproof rating continuous glucose monitor products, not all manufacturers explicitly state an IP code on their product pages.
Some brands describe waterproof specifications directly using maximum permitted depth and submersion time, which conveys the same information in a different format.
Always read your device's official user manual before use to obtain accurate waterproof specifications.
Which CGM Is Waterproof? A UK Device Comparison
The table below summarises the official waterproof specifications for mainstream CGM devices available in the UK market. The answer to which cgm is waterproof varies by device model.
All data has been sourced from each brand's official product pages — always refer to the latest official documentation for the most current information.
| Brand / Device | Maximum Depth | Maximum Duration | Notes |
|---|---|---|---|
| Abbott FreeStyle Libre 2 | 1 metre (3 feet) | 30 minutes | Water-resistant [2] |
| Abbott FreeStyle Libre 3 | 1 metre (3 feet) | 30 minutes | Water-resistant [3] |
| Dexcom G7 | 2.4 metres (8 feet) | 24 hours | Waterproof, without failure when properly installed [4] |
| Dexcom ONE+ | 2.4 metres (8 feet) | 24 hours | Waterproof, without failure when properly installed [5] |
| Medtronic Guardian 4 | Please refer to Medtronic's official guidance | Please refer to official guidance | Typically used as a component of the MiniMed 780G hybrid closed-loop insulin pump system, not a standalone CGM device |
| SIBIONICS GS3 | 1 metre (3 feet) | 1 hour | Water-resistant, IP38 (per official user guide), CE-certified, European market [6] |
As the table shows, waterproof specifications vary considerably across cgm suppliers. The SIBIONICS GS3 supports submersion up to 1 metre for a maximum of 1 hour, with an IP38 rating per its official user guide.
Dexcom devices are rated to 2.4 metres, making them suitable for a wider range of water activities.
An important note: most CGM brands' display devices or receivers are not waterproof and must be kept separate and away from water during water activities.
Can I Swim With My CGM?
For most CGM users, swimming in a pool is possible, provided the activity stays within the depth and duration limits stated in the device's official guidelines.
Sensor adhesive failure after water activities is one of the most commonly reported issues among long-term CGM users — preparation beforehand is far more effective than addressing the problem afterwards.
Diabetes UK notes that "sensors are generally recommended to be protected with additional fixation tape during water activities," which helps reduce the risk of sensor detachment in water.
When selecting cgm supplies, ensure any accessories are compatible with your specific device model, and consult the device manufacturer's guidance in advance.
Open-water swimming (such as in the sea or a lake) requires additional attention to water pressure, which increases with depth. If you plan to scuba dive or engage in deep-water sports, check your device's maximum permitted depth carefully.
After swimming, gently pat the sensor area dry with a clean, dry towel — avoid rubbing vigorously, as this may dislodge the sensor.
How To Protect Your CGM Sensor In Water?
Even when a CGM device has official water-resistance certification, the sensor adhesive can still loosen after prolonged submersion, sweating, or friction.
The following guidance is general in nature — specific recommendations vary by brand and model, so always refer to your device's official user manual.
Before water activities, clean and thoroughly dry the skin before applying the sensor to ensure the best possible adhesion.
Some users apply the sensor one to two hours before the activity, allowing the adhesive to fully cure before entering the water.
During water activities, avoid scratching or pulling at the sensor area. Afterwards, gently pat the skin around the sensor dry and check whether the sensor edges are still securely attached.
If any lifting is noticed, follow the manufacturer's guidance on how to address it. The most important step before any water activity is to carefully read the official user manual for your specific device.
Do CGM Waterproof Ratings Affect Day-to-Day Use?
For everyday use, the waterproofing capabilities of mainstream CGM devices available in the UK are more than sufficient for common scenarios such as showering and washing up.
However, the cgm waterproof rating does remain significant in certain contexts.
Swimming — especially for extended periods — requires verification of the device's maximum permitted submersion time.
In hot baths or saunas, high temperatures can affect the adhesive more significantly than depth alone, even within the device's stated waterproof specification — extra care is advised.
In water sports such as surfing or kayaking, water pressure and dynamic forces may also affect sensor adhesion.
The waterproof specifications provided by cgm brands reflect the specific test conditions passed during factory testing and do not constitute a universal guarantee for all extreme scenarios.
It is worth noting that CGM sensors work by detecting glucose concentration in the subcutaneous interstitial fluid, then converting this via an algorithm to an estimated blood glucose value.
There is a physiological lag time of approximately 5 to 15 minutes between interstitial fluid glucose readings and actual blood glucose levels.
The purpose of waterproof design is to protect the sensor's internal electronic components and adhesive system — it does not affect the glucose detection function itself.
Verdict
Overall, mainstream CGM devices available in the UK now offer sufficient waterproof cgm capability for everyday showering and most swimming scenarios.
Specific ratings vary considerably between devices, ranging from 1 metre for 30 minutes to 2.4 metres for 24 hours.
The most important principle is this: always use your specific device's official user manual as the definitive reference. Waterproof specifications from one brand or model cannot be applied to another.
For full details on the waterproofing of SIBIONICS CGM products, visit the SIBIONICS official website or refer to the user manual included with your device.
All decisions regarding CGM indications, usage restrictions, and medical management should be made in consultation with a healthcare professional.
FAQ
Q: Are CGM Devices Waterproof?
Most modern CGM sensors offer some degree of water resistance or waterproofing, but the level varies by brand and model.
Whether is cgm waterproof depends on the specific device — some support 1 metre for 30 minutes, while others support 2.4 metres for 24 hours. Always check the official specifications before purchasing.
Q: Can I Shower With My CGM?
Yes, mainstream CGM devices in the UK market generally support showering while worn.
However, different brands have varying guidelines on water pressure and duration — refer to your specific device's user manual for details on any precautions for showering.
Q: What Is The Best Waterproof CGM?
Evaluating the best waterproof cgm depends on your personal use case. Dexcom G7 and Dexcom ONE+ support 2.4 metres depth, making them more suitable for deeper water.
Abbott FreeStyle Libre 2 and Libre 3 support 1 metre for 30 minutes, suitable for everyday swimming. SIBIONICS GS3 (CE-certified, European market) supports 1 metre depth for up to 1 hour.
Q: Is A CGM Waterproof Cover Necessary?
A cgm waterproof cover is not essential, but it can provide additional adhesion and physical protection for the sensor, particularly in higher-intensity water activities.
Ensure any accessory is compatible with your specific device model and does not interfere with normal sensor function before use.
Q: Which CGM Is Waterproof For Swimming?
Most CGM devices in the UK market support swimming, but maximum permitted depth and duration vary by model.
The most comprehensive reference for which cgm is waterproof is the water activities section of each device's official user manual.
If specifications change due to a product update, always defer to the most recent official documentation.
References
[1] Diabetes UK. (2023). Continuous glucose monitors. diabetes.org.uk. https://www.diabetes.org.uk/about-diabetes/looking-after-diabetes/technology/continuous-glucose-monitors
[2] Abbott. FreeStyle Libre 2 System. freestyle.abbott. https://www.freestyle.abbott/uk-en/products/freestyle-libre-2.html
[3] Abbott. FreeStyle Libre 3 System. freestyle.abbott. https://www.freestyle.abbott/uk-en/products/freestyle-libre-3.html
[4] Dexcom. Can I get Dexcom G7 Continuous Glucose Monitor wet? dexcom.com. https://www.dexcom.com/en-gb/faqs/can-i-get-dexcom-g7-wet
[5] Dexcom. Dexcom ONE+ CGM System. dexcom.com. https://www.dexcom.com/en-gb/dexcom-one-plus-cgm-system
[6] SIBIONICS. SIBIONICS GS3 CGM – Continuous Glucose Monitoring System. sibionicscgm.com. https://www.sibionicscgm.com/products/sibionics-gs3-cgm-continuous-glucose-monitoring-system
Disclaimer
This article is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Author Information
This article was written by the SIBIONICS Professional Health Content Team. The author has years of research experience in CGM and diabetes management, helping users optimize their device experience through science-based practices.
Last Updated: May 09, 2026
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2.Can You Shower With CGM Sensor 2026: Know Expert Advices!
3.Will Insurance Cover CGM For PCOS: What To Know?
