Complete guide to water sensors

Posted March 11th, 2025 by SimpliSafe

Are you worried about unexpected water damage in your home? It’s a valid concern, especially as technology, piping and wiring can all be rather unpredictable. Fortunately, SimpliSafe has a way to combat this worry with water sensors. 

So whether you’re worried about a dodgy washing machine leaking, a pipe bursting or something else that involves water leaks, discover what a sensor to detect water leaks can do, and how it can help protect your home.

What is a water sensor?

A water sensor (also known as a water leak detector/sensor, water detection sensor or moisture sensor) is a home security device that’s designed to detect water in areas where it shouldn't be. Water sensors and motion sensors, whilst similar, are different in the sense that the former is triggered by the presence of liquids.

They’re best used in homes and businesses to alert you of the presence of water, providing early detection of leaks, flooding, or excessive moisture buildup. Whilst they don’t help absorb moisture or fix the issue, they can possibly serve as a preventative measure, especially if they sound an alarm or send an alert to your smartphone.

How do water leak sensors work?

Water leak sensors work by detecting the presence of water through their built-in sensors. With SimpliSafe’s Water Sensor, you can find the three sensors on the bottom of the device.

What are the benefits of a water detection sensor?

Water leak detection sensors offer lots of benefits. Whether you own your home or don’t, having a water sensor may possibly help reduce the likelihood of significant water damage. 

1. Early leak detection 

Perhaps the most important advantage is early detection of the presence of water. This can allow you to address the problem as soon as you’re able to, particularly if you opt for professional monitoring, or you hear the alarm whilst you’re already at home

2. Early prevention of mould

Even a small, slow leak can lead to extensive water damage, mould growth, and costly repairs if left undetected. For example, you may have to replace carpets, re-paint walls or fix structural issues as a result of water damage. 

3. Identify issues with your appliances

Technology fails at the worst of times - and your home appliances and white goods are no exception. By installing water sensors strategically around your home, you can prevent or minimise water damage caused by leaks from appliances or even plumbing. This not only saves you money on costly repairs and replacements, but also helps protect your home's structural integrity and prevents the need for extensive remediation efforts.

4. Peace of mind

Water sensors provide peace of mind, particularly when you're away from home or live in an area prone to flooding. Plus, if your home has a basement, laundry room, or downstairs bathroom, the extra comfort of knowing you have a water sensor in these areas will really help. 

Where to place water leak detector sensors

Where you place your water leak detector matters. To prevent water damage in your home, here are some recommended places and factors to consider:

• Basements: Though rare in the UK, they’re common in terraced housing. Basements are prone to water intrusion from various sources, such as heavy rainfall and plumbing leaks. Place sensors near foundation walls and in low-lying areas where water may be likely to gather.

• Bathrooms: For obvious reasons, a bathroom should be your first port of call. Position water sensors near toilets (including behind them), sinks, baths, and showers. However, make sure it’s not in a position where it may accidentally be splashed with water.

• Kitchens: Place your water sensors near appliances likely to leak - such as fridges, sinks and dishwashers.

• Boiler rooms: Boiler rooms, though often dry, can suffer from damage and lead to leaks. Place a water sensor at the base of the boiler. The same goes for if your boiler is placed anywhere else in your home.

• Lofts: Piping and roof problems can cause water to accumulate in a loft. Consider placing sensors in these areas if you have concerns or have experienced past leaks.

• Ground floor flats: Use a water sensor as part of your ground floor flat security system, as depending on its location, it may be prone to floods.

When determining sensor placement, consider the following factors:

1. Where leaks could happen

2. How water may accumulate on a floor/surface

3. How accessible it is to place your water sensor and rectify a leak

4. The wireless range of the water sensor

Regarding that last point, many modern water leak sensors integrate seamlessly with smart home systems, allowing you to receive real-time alerts and notifications on your smartphone or other connected devices. This level of connectivity ensures you're always aware of potential water leaks, even when you're not at home!

How to maintain your water sensor

A water sensor is no good if it isn’t looked after properly. Here are some ways to ensure your water sensor is in tip-top condition for functional use.

1. Check the battery life

Our sensors last between 3-5 years, meaning you won’t have to replace your battery as often and the system will alert you when the battery is low. The range is dependent on how often your water sensor triggers too. The less it triggers, the longer your battery life.

Always check with the security company what batteries they use, what warranty is available, if the batteries are included and if the batteries can be replaced on your own.

2. Clean it

Water sensors can accumulate dust, debris, or mineral buildup over time, which can affect their sensitivity and performance. Follow the manufacturer's instructions for cleaning and maintaining your sensors. This may involve wiping down the sensor probes or contacts with a soft cloth. It goes without saying not to use water on your water sensor to avoid an unnecessary trigger.

3. Test it

Regularly testing your water sensors is important to ensure it works as it should. Some water sensors have a built-in test button or mode that simulates a water leak, allowing you to test the sensor without introducing actual water. With SimpliSafe, you could test the Water Sensor along with the wider system.

False alarms from a water sensor: What should I do?

While water sensors are designed to detect leaks, false alarms may occur due to various reasons, such as high humidity, condensation, or sensor malfunction. Here’s how you can help prevent false alarms at home.

1. Check the sensor's placement, ensuring it’s not in an area with high humidity or condensation.

2. Clean the sensor probes or contacts, as debris or mineral buildup can cause false triggers.

3. Replace the batteries.

4. If the issue persists, consider relocating the sensor or consulting the manufacturer for further troubleshooting.

Ready to bolster your home security? Consider adding water sensors and placing them where they’re needed the most. Contact us for more information on how our home security systems can help protect your home.