Mercury Water Leak Detection Requirement – What to Know

If you have a Mercury homeowners policy — or you're shopping for one — there's an important change coming. Starting May 29, 2026, Mercury Insurance will require qualifying smart water leak detection devices on certain new standard homeowners policies (HO-3).

This isn't optional for those who fall under the new guidelines, and your policy could be affected at your first renewal. Below, we break down who needs to comply, which devices qualify, and how to get it done — plus how you could save money in the process.

 

Who Is Required to Install a Water Leak Detection Device?

Mercury's new requirement applies to new standard homeowners policies (HO-3), effective May 29, 2026, and later. A qualifying device must be installed before your first renewal if your property meets any of the following criteria:

• 30 years old or older and located in a high non-weather water risk territory
• 50 years old or older with a dwelling coverage limit (Coverage A) of $2 million or more
• 30 years old or older with a dwelling coverage limit (Coverage A) of $2.5 million or more
• Any age with a dwelling coverage limit (Coverage A) of $3 million or more

If your home falls into any of these categories, you'll need to act before your first policy renewal to remain in compliance.

 

Why Is Mercury Requiring This?

Water damage is the leading cause of homeowners insurance claims — and it's largely preventable. According to Mercury Insurance official press release, more than 40% of a California home's premium is attributable to non-weather water damage. Aging plumbing in older homes significantly increases the risk of leaks, burst pipes, and catastrophic water loss.

Smart leak detection devices catch problems early, often before homeowners even notice, preventing small drips from becoming $50,000 disasters. Mercury's goal is straightforward: reduce claims, protect homes, and keep premiums more stable for everyone.

 

Three Types of Qualifying Devices

Mercury accepts devices from three categories. Here's what each one does and who should consider it:

1. Whole Home Water Flow Monitoring

These devices attach to your water meter or main water line and continuously track water flow throughout your home. When something unusual happens (like a slow leak or a burst pipe) the system sends real-time alerts to your phone.

Best for: Most homeowners looking for a simple, non-invasive solution.

Popular options: Flume 2 Smart Home Water Monitor (self-install, ~$99 through Mercury's program + $49/year subscription, first year free)

2. Smart or Centrally Monitored Leak Detection and Shutoff

These devices install directly on your main water line and do everything a flow monitor does — plus they can automatically shut off your water supply when a leak is detected. This is the most comprehensive protection available.

Best for: Homeowners who want maximum protection, especially those with high-value or secondary/seasonal homes. Mercury requires this type for secondary or seasonal homes with a dwelling coverage limit (Coverage A) of $2 million or more.

Popular options: Flo by Moen Smart Water Shutoff, Phyn Plus Smart Water Assistant, Beagle Services professional installation (available through Mercury's partnership in Southern California and the Bay Area)

3. Smart Point of Leak Sensors

These are individual sensors placed near water sources, like under sinks, behind toilets, and near water heaters, that send an alert when water physically touches the sensor. They're the most affordable option but provide targeted rather than whole-home protection.

Important requirement: If you choose this option, you must install at least two more sensors than the total number of bathrooms in your home. For example, a 3-bathroom home requires at least 5 sensors.

Best for: Budget-conscious homeowners who want targeted monitoring in high-risk areas.

Popular options: Phyn Smart Water Sensor, D-Link Wi-Fi Water Sensor, First Alert Wi-Fi Water Leak and Freeze Detector

 

How to Comply With Mercury's Requirement

Getting compliant is straightforward. Follow these steps:

Step 1: Determine if you're affected. Review the property age and dwelling coverage thresholds listed above. If you're unsure whether your property falls in a high non-weather water risk territory, contact your insurance agent.

Step 2: Choose a qualifying device. Pick from one of the three categories above based on your needs and budget. If you have a secondary or seasonal home with a dwelling coverage limit of $2 million or more, you must choose a shutoff device (Category 2).

Step 3: Purchase and install the device. Mercury has partnered with Flume and Beagle Services for preferred pricing. You can also purchase qualifying devices from other manufacturers and retailers.

Step 4: Submit proof of installation. If you used a Mercury preferred vendor, they may validate your installation directly. Otherwise, submit proof through your agent or email Mercury at Policydocs@mercuryinsurance.com with your policy number in the subject line.

Step 5: Notify your agent. Let your Mercury agent know once the device is installed so your policy can be updated and any available discount applied.

 

Save Money With a Water Leak Detection Discount

Here's the silver lining: installing a qualifying device doesn't just keep you compliant — it can also lower your insurance premium. Mercury currently offers a homeowners discount for water leak detection devices on standard homeowners policies (HO-3) in the following states:

• Arizona
• California (policies effective 12/15/2023 and later)
• Georgia
• Illinois
• Nevada
• New Jersey
• Oklahoma
• Texas
• Virginia

The discount applies after the device is installed and verified. Notify your agent promptly so your savings kick in as soon as possible.