Water Leak Sensors on a Security System: Monitored or Not

What does monitoring add to a water leak sensor?

Less than most people assume. A burglar or smoke alarm on a monitored plan ends with the monitoring center requesting police or fire response. A water alarm does not. Both brands that publish their response plans say so directly:

• SimpliSafe groups water and temperature sensors as Environmental alarms. When one triggers, your Primary Contacts get an automated voice message, then your Secondary Contacts if nobody is reached. SimpliSafe's support page states that environmental alarms do not result in dispatch whether or not you answer. If you cancel or disarm within about the first minute, no call is placed.
• Ring states in its monitoring response plans that the Flood & Freeze Sensor "does not offer dispatch services." With a compatible Ring subscription you can switch on automated calls for water and for low temperature: the monitoring center calls your primary contact, then the second emergency contact if the first does not answer. The alarm can fire whether the system is in Home, Away or Disarmed mode.
• ADT lists ADT Professional monitoring as a requirement for its Water & Temperature Sensor, and its support article says a wet probe makes the ADT Base sound an audible and visual alarm for up to 5 minutes. We could not find a published ADT response plan for water alarms, so ask the sales rep whether a person or a machine calls you, and who.
• Abode markets its Water Leak Sensor around an 85-decibel built-in siren and an immediate mobile notification.

So the real upgrade from monitoring is a phone call that reaches you when a push notification would not: you are asleep, your phone is silenced, or you are on a plane. That is worth something in a vacant or seasonal home, and nothing in a house where someone hears the siren within minutes. Nobody is sent to turn off the water either way. If a leak at 3 a.m. while you are away is the scenario you are paying to cover, you need a person nearby who can respond, or an automatic shut-off valve, not just a monitoring plan.

How much do security system leak sensors cost?

Published prices and specs as of October 1, 2026, from each brand's own product pages:

Of the sensors covered here, SimpliSafe's is the cheapest at its regular price and Ring's newest model is the only one that needs no hub at all, which matters if you want a leak sensor in a detached building or a home with no security system. Ring's catch is Sidewalk: the sensor depends on Amazon Sidewalk coverage, which Ring says may vary by location.

The sensor is the small number. The monitoring plan is the large one: SimpliSafe's cheapest professionally monitored plan, Standard, is 76 cents a day (about $22.80 for a 30-day month, our arithmetic), and Ring's plans page lists 24/7 Professional Monitoring with Ring Pro at $19.99 a month or $199.99 a year. Neither price is justified by leak sensors alone, given that neither brand dispatches for water. Leak coverage is a reason to add sensors to a plan you would buy for burglary and fire anyway. The same logic applies to fire: see whether monitored smoke and CO detectors are worth it, where the monitoring center does dispatch.

Do insurers discount or supply water leak sensors?

Some do, but the programs we found are tied to specific third-party devices, not to the leak sensor that came with your alarm system. As of October 2026, on the insurers' own pages:

USAA's page is explicit that a Flume or other brand does not qualify. None of these three pages names a SimpliSafe, Ring, ADT or Abode leak sensor as a qualifying device, so do not assume your alarm's water sensor earns a credit. Ask your insurer which devices count before you buy, and whether the device has to share data. We compare published security and smart home discounts in home insurance security discounts by insurer. Discounts depend on the insurer, state and policy, and none is guaranteed.

When is a monitored leak sensor worth it?

By the published response plans, here is how the choice sorts out:

1. Occupied home, someone usually there. A local siren plus app alerts covers it. Buy the sensor, skip any plan you would buy only for water.
2. You already pay for professional monitoring. Add leak sensors near the water heater, washing machine, dishwasher and under sinks. The automated call costs nothing extra on the plans covered here and is a useful backstop to a missed notification.
3. Vacant, seasonal or rental property. The call matters most here, but it only helps if someone can act on it. Pair the sensors with a person who has a key, and consider a shut-off valve; Abode, for example, publishes an integration guide for the Dome water main shut-off. Cold-weather homes should also watch temperature, which is the subject of our guide to freeze sensors for vacant homes, and the wider setup is in vacation home security monitoring.

Placement follows the same logic as any other sensor: one per water source you care about, on the floor where water will pool first. Leak sensors also share the system and battery realities of the rest of the kit, covered in our door and window sensor comparison.

If you are shopping for professional monitoring anyway and want water, fire and burglary signals handled on one plan, our short questionnaire at /quote fetches quotes from professional monitoring providers. Ask each one directly whether water alarms get a call from a person, an automated message, or nothing.