Exhibit 21

SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY

an Oregon Corporation

Name of Subsidiary	Jurisdiction Organized
Northwest Natural Gas Company (dba NW Natural)	Oregon
Northwest Energy Corporation(1)	Oregon
NWN Gas Reserves LLC(1)	Oregon
Gill Ranch Storage, LLC	Oregon
NW Natural Energy, LLC	Oregon
NW Natural Gas Storage, LLC	Oregon
NNG Financial Corporation	Oregon
Trail West Holdings, LLC	Delaware
Trail West Pipeline, LLC	Delaware
BL Credit Holdings, LLC	Delaware
Northwest Biogas, LLC	Oregon
KB Pipeline Company	Oregon
NW Natural Water Company, LLC	Oregon
NW Natural Water of Oregon, LLC	Oregon
NW Natural Water of Washington, LLC	Washington
Cascadia Water, LLC	Washington
NW Natural Water of Idaho, LLC	Idaho
Gem State Water Company, LLC	Idaho
Falls Water Co., Inc.	Idaho
Salmon Valley Water Company	Oregon

⁽¹⁾     Subsidiary of Northwest Natural Gas Company