Tinian in the Northern Marianas appears to have sustained major damage after being battered by the fringes of Typhoon Champi at the weekend.
Saipan in the CNMI emerged unscathed but Tinian got over 600 millimetres of rain and its water supply has been damaged.
The Commonwealth Utilities Corporation says rain resulted in erosion which has exposed a section of the water main and moved it out of alignment..
Several villages are currently without water services.
Champi strengthened into a typhoon after blowing through the Marianas on Friday, bringing strong winds and torrential rain.