Business Combinations Business Combinations	9 Months Ended
Business Combinations Business Combinations	Sep. 30, 2023
Business Combinations [Abstract]
Business Combination Disclosure	BUSINESS COMBINATIONS 2023 Business Combinations During the nine months ended September 30, 2023, NWN Water and its subsidiaries acquired the assets of two businesses qualifying as business combinations. The aggregate fair value of the preliminary consideration transferred for these acquisitions was $3.6 million, most of which was preliminarily allocated to property, plant, and equipment, and goodwill. These transactions align with NW Holdings' water and wastewater sector strategy as it continues to expand its water and wastewater service territories and included: •Pedersen Family, LLC in Washington •King Water Corporation in Washington In October 2023, NWN Water completed the acquisition of Rose Valley Water Company. Located in Peoria, Arizona, this water utility serves approximately 2,400 connections. Also in October 2023, NWN Water completed the water services business portion of the Hiland Water asset acquisition. This water and wastewater services business supports approximately 6,400 connections across Oregon. The preliminary allocation of consideration to the acquired assets and assumed liabilities based on their fair value is not yet complete as valuation procedures are pending. Acquisition costs were insignificant and were expensed as incurred. 2022 Business Combinations During 2022, NWN Water and its subsidiaries acquired the assets of seven businesses qualifying as business combinations. The aggregate fair value of the preliminary consideration transferred for these acquisitions was $105.7 million, most of which was preliminarily allocated to property, plant and equipment and goodwill. These transactions align with NW Holdings' water and wastewater sector strategy as it continues to expand its service territories and included: •Far West Water & Sewer, Inc. in Arizona •Belle Oaks Water and Sewer Co., Inc in Texas •Northwest Water Services, LLC in Washington •Aquarius Utilities, LLC in Washington •Valiant Idaho, LLC (The Idaho Club - Sewer) in Idaho •Caney Creek in Texas •Water Necessities, Inc. and Rural Water Co. in Texas As each of these acquisitions met the criteria of a business combination, a preliminary allocation of the consideration to the acquired net assets based on their estimated fair value as of the acquisition date was performed. The allocation for each of these business combinations is considered preliminary as of September 30, 2023. In accordance with U.S. GAAP, the fair value determination involves management judgment in determining the significant estimates and assumptions used and was made using existing regulatory conditions for net assets. These allocations are considered preliminary as of September 30, 2023, as facts and circumstances that existed as of the acquisition date may be discovered as we continue to integrate the acquired businesses. As a result, subsequent adjustments to the preliminary valuation of tangible assets, contract assets and liabilities, tax positions, and goodwill may be required. Subsequent adjustments are not expected to be significant, and any such adjustments are expected to be completed within the one-year measurement period for all acquisitions described above. Goodwill NW Holdings allocates goodwill to reporting units based on the expected benefit from the business combination. We perform an annual impairment assessment of goodwill at the reporting unit level, or more frequently if events and circumstances indicate that goodwill might be impaired. An impairment loss is recognized if the carrying value of a reporting unit’s goodwill exceeds its fair value. As a result of all acquisitions completed, total goodwill was $152.4 million, $74.7 million, and $149.3 million as of September 30, 2023, September 30, 2022, and December 31, 2022, respectively. All of our goodwill is related to water and wastewater acquisitions and is included in the other category for segment reporting purposes. The annual impairment assessment of goodwill occurs in the fourth quarter of each year. There have been no impairments recognized to date.