Crj captain reported that a false terrain warning sounded during descent.

Attributes
ACN	1576365
Time
Date	201809
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 700 ER/LR (CRJ700)
Operating Under FAR Part	Part 121
Flight Phase	Descent
Component
Aircraft Component	GPWS
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter CFTT / CFIT

Narrative:

Descending for the RNAV approach on a 90 degree base 5 miles from the final approach fix descending to 2300 feet. Around 2500 feet the terrain warning sounds while in IMC conditions so we execute a terrain escape maneuver and climb out to 4000 feet. I informed ATC what we were doing and he informed us there was no terrain in that area. He then vectored us back around to the approach course and we landed. The terrain message sounded again at 2300 feet coming back around again but we knew this one was erroneous by talking to ATC and we were level about to intercept final approach course. The GPWS was then deferred once we got on the ground. Comply with the warning first and fly the airplane. There is plenty of time to figure out if it is an incorrect warning once clear of the occurrence.

Original NASA ASRS Text

Title: CRJ Captain reported that a false terrain warning sounded during descent.

Narrative: Descending for the RNAV approach on a 90 degree base 5 miles from the final approach fix descending to 2300 feet. Around 2500 feet the terrain warning sounds while in IMC conditions so we execute a terrain escape maneuver and climb out to 4000 feet. I informed ATC what we were doing and he informed us there was no terrain in that area. He then vectored us back around to the approach course and we landed. The terrain message sounded again at 2300 feet coming back around again but we knew this one was erroneous by talking to ATC and we were level about to intercept final approach course. The GPWS was then deferred once we got on the ground. Comply with the warning first and fly the airplane. There is plenty of time to figure out if it is an incorrect warning once clear of the occurrence.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.