FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS (Tables)

12 Months Ended

Dec. 31, 2024

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes to Accrued Capping, Closure and Post-Closure Liabilities

The changes to accrued final capping, closure and post-closure liabilities are as follows:


	Fiscal Year Ended December 31,
	2024		2023
Beginning balance	$	133,904	$	113,678
Obligations incurred	7,093		5,447
Revisions in estimates (1)	29,537		14,030
Accretion expense	11,350		9,529
Obligations settled (2)	(8,765)		(11,801)
(Recovery) write-off of capping payments (3)	(889)		3,021
Ending balance	$	172,230	$	133,904

(1)Relates to changes in estimates and assumptions concerning anticipated waste flow, costs, including as a result of higher inflation, and timing of future final capping, closure and post-closure activities at our landfills. Fiscal year 2024 includes $8,385 related to the revision in estimates of the post-closure liability for the Town of Southbridge, Massachusetts landfill (“Southbridge Landfill”), related to the final closure permit. See Note 17, Other Items and Charges for further disclosure over the Southbridge Landfill revision.

(2)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.

(3)Relates to the write-off of historical payments associated with capping work that was deemed no longer viable due to a veneer failure at the Ontario County Landfill, which we operate, that occurred in fiscal year 2023, and subsequent partial recovery in fiscal year 2024 after an engineering evaluation determined that a portion of the affected area was still viable. See Note 17, Other Items and Charges for additional disclosure.