A roof drain system for use with a roofing membrane of a roof substructure, the roof drain system comprising: a roof drain, the roof drain comprising: a drain plate configured to be at least partially disposed underneath the roofing membrane, a drain opening extending through the drain plate, the drain opening configured to be fluidly coupled to a drain pipe; and a drain cap extending at least partially around the drain opening; and a detector, the detector comprising: a water seepage detection module configured to be disposed between the roof substructure and the roofing membrane, the water seepage detection module including a water seepage sensor configured to generate a water seepage signal in response to detecting water seepage beneath the roofing membrane; and a monitoring module configured to be disposed above the roofing membrane, the monitoring module including: water level monitoring circuitry to generate a water level signal; and control circuitry to wirelessly receive the water seepage signal and transmit a gateway signal, the gateway signal including data representative of at least one of the water seepage signal or water level signal, wherein the drain plate includes a water sensor aperture configured to allow a portion of the water seepage sensor to extend below an upper surface of the drain plate. a roof drain, the roof drain comprising: a drain plate configured to be at least partially disposed underneath the roofing membrane, a drain opening extending through the drain plate, the drain opening configured to be fluidly coupled to a drain pipe; and a drain cap extending at least partially around the drain opening; and a drain plate configured to be at least partially disposed underneath the roofing membrane, a drain opening extending through the drain plate, the drain opening configured to be fluidly coupled to a drain pipe; and a drain cap extending at least partially around the drain opening; and a detector, the detector comprising: a water seepage detection module configured to be disposed between the roof substructure and the roofing membrane, the water seepage detection module including a water seepage sensor configured to generate a water seepage signal in response to detecting water seepage beneath the roofing membrane; and a monitoring module configured to be disposed above the roofing membrane, the monitoring module including: water level monitoring circuitry to generate a water level signal; and control circuitry to wirelessly receive the water seepage signal and transmit a gateway signal, the gateway signal including data representative of at least one of the water seepage signal or water level signal, wherein the drain plate includes a water sensor aperture configured to allow a portion of the water seepage sensor to extend below an upper surface of the drain plate. a water seepage detection module configured to be disposed between the roof substructure and the roofing membrane, the water seepage detection module including a water seepage sensor configured to generate a water seepage signal in response to detecting water seepage beneath the roofing membrane; and a monitoring module configured to be disposed above the roofing membrane, the monitoring module including: water level monitoring circuitry to generate a water level signal; and control circuitry to wirelessly receive the water seepage signal and transmit a gateway signal, the gateway signal including data representative of at least one of the water seepage signal or water level signal, wherein the drain plate includes a water sensor aperture configured to allow a portion of the water seepage sensor to extend below an upper surface of the drain plate. water level monitoring circuitry to generate a water level signal; and control circuitry to wirelessly receive the water seepage signal and transmit a gateway signal, the gateway signal including data representative of at least one of the water seepage signal or water level signal, wherein the drain plate includes a water sensor aperture configured to allow a portion of the water seepage sensor to extend below an upper surface of the drain plate.