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The information in this preliminary prospectus supplement is not complete and may be changed. This prospectus supplement and the accompanying base prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any state or any other jurisdiction where the offer or sale is not permitted.

Filed Pursuant to Rule 424(b)(5)

Registration Statement No. 333-282813

Subject to Completion,
Preliminary Prospectus Supplement dated July 27, 2026

PRELIMINARY PROSPECTUS SUPPLEMENT
(To prospectus dated October 24, 2024)

Waste Connections, Inc.

% Senior Notes due 2033
% Senior Notes due 2036

We are offering C$ aggregate principal amount of % Senior Notes due 2033 (the “2033 Notes”) and C$ aggregate principal amount of % Senior Notes due 2036 (the “2036 Notes” and, together with the 2033 Notes, the “Notes” and each, a “series of Notes”). We will pay interest on the 2033 Notes and the 2036 Notes semi-annually on and of each year, beginning , 20 . The first payment of interest shall be a long first coupon. The 2033 Notes will mature on , 2033 and the 2036 Notes will mature on , 2036.

We may redeem some or all of the Notes of a series at any time at the applicable redemption price described in this prospectus supplement. We also have the right to redeem all of the Notes of a series if, at any time, certain changes in law require us to make additional payments with respect to taxes withheld from payments on the Notes of such series. See “Description of Notes — Optional Redemption.”

If a change of control triggering event as described in this prospectus supplement occurs, we will be required, subject to certain exceptions, to make an offer to each holder of Notes to purchase all or any part of that holder’s Notes for cash at a purchase price equal to 101% of the principal amount of the Notes to be purchased, plus accrued and unpaid interest, if any, on those Notes to, but excluding, the purchase date. See “Description of Notes — Change of Control Triggering Event.”

The Notes will be our senior, unsecured obligations and will rank equally in right of payment with all of our existing and future senior, unsecured indebtedness and will rank senior in right of payment to any future indebtedness that we incur that is expressly subordinated to the Notes. The Notes will be effectively subordinated to any future secured indebtedness that we incur to the extent of the value of the collateral securing such indebtedness. In addition, the Notes will be structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables, of our subsidiaries.

Investing in the Notes involves risks. You should read carefully the entire accompanying base prospectus and this prospectus supplement and the documents incorporated by reference herein and therein, including the section entitled “Risk Factors” beginning on page S-9 of this prospectus supplement.

Per
2033 Note

Total
2033 Notes

Per
2036 Note

Total
2036 Notes

Price to public(1)

Underwriting discount(2)

Proceeds, before expenses, to us(1)

(1)

Plus accrued interest from , 2026, if settlement occurs after that date.

(2)

For additional underwriting compensation information, see “Underwriting (Conflicts of Interest).”

Neither the United States Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying base prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The Notes are new issues of securities with no established trading markets. We do not intend to list the Notes on any securities exchange.

The Notes will be ready for delivery in book-entry form on or about , 2026 through the facilities of CDS Clearing and Depository Services Inc. (“CDS”) for the accounts of its participants. Investors in a series of Notes may hold their Notes through Euroclear Bank S.A./N.V., as operator of the Euroclear System, and Clearstream Banking, société anonyme.

Joint Book-Running Managers

CIBC Capital Markets

Scotiabank

TD Securities

Co-Managers

J.P. Morgan

BofA Securities

Mizuho

The date of this prospectus supplement is , 2026

	FORWARD-LOOKING STATEMENTS					S-iv
	SUMMARY					S-1
	THE OFFERING					S-2
	SUMMARY FINANCIAL DATA					S-6
	RISK FACTORS					S-9
	USE OF PROCEEDS					S-14
	CAPITALIZATION					S-15
	DESCRIPTION OF NOTES					S-16
	CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS					S-33
	CERTAIN CANADIAN FEDERAL INCOME TAX CONSIDERATIONS					S-37
	CERTAIN ERISA CONSIDERATIONS					S-38
	UNDERWRITING (CONFLICTS OF INTEREST)					S-40
	ENFORCEABILITY OF CIVIL LIABILITIES AGAINST FOREIGN PERSONS					S-46
	LEGAL MATTERS					S-47
	EXPERTS					S-48
	INCORPORATION OF CERTAIN INFORMATION BY REFERENCE					S-49
	WHERE YOU CAN FIND MORE INFORMATION					S-50

	ABOUT THIS PROSPECTUS					1
	FORWARD-LOOKING STATEMENTS					1
	WASTE CONNECTIONS, INC.					2
	RISK FACTORS					3
	USE OF PROCEEDS					3
	DESCRIPTION OF DEBT SECURITIES					3
	GLOBAL SECURITIES					10
	PLAN OF DISTRIBUTION					12
	LEGAL MATTERS					12
	EXPERTS					12
	INCORPORATION OF CERTAIN INFORMATION BY REFERENCE					12
	WHERE YOU CAN FIND MORE INFORMATION					13

	Six Months Ended June 30,						Year Ended December 31,
	2026			2025			2025			2024			2023
	(unaudited)						(audited)
	(in thousands of U.S. dollars)
STATEMENT OF OPERATIONS DATA:
Revenues		$	4,932,239		$	4,635,231		$	9,466,915		$	8,919,591		$	8,021,951
Operating expenses:
Cost of operations			2,840,317			2,684,299			5,455,382			5,191,706			4,744,513
Selling, general and administrative			511,612			493,100			959,544			883,445			799,119
Depreciation			545,762			499,728			1,030,565			974,001			845,638
Amortization of intangibles			94,864			97,878			201,541			189,768			157,573
Impairments and other operating items			138,050			10,471			109,709			613,012			238,796
Operating income			801,634			849,755			1,710,174			1,067,659			1,236,312
Interest expense			(178,922)			(163,626)			(334,551)			(326,804)			(274,642)
Interest income			7,239			4,084			12,139			11,607			9,350
Other income (expense), net			37,337			11,922			30,154			10,471			12,481
Income before income tax provision			667,288			702,135			1,417,916			762,933			983,501
Income tax provision			(151,546)			(170,348)			(341,359)			(146,363)			(220,675)
Net income			515,742			531,787			1,076,557			616,570			762,826
Plus (less): Net loss (income) attributable to noncontrolling interests			—			—			—			1,003			(26)
Net income attributable to Waste Connections		$	515,742		$	531,787		$	1,076,557		$	617,573		$	762,800

	As of June 30,						As of December 31,
	2026			2025			2025			2024			2023
	(unaudited)						(audited)
	(in thousands of U.S. dollars)
BALANCE SHEET DATA:
Cash and equivalents		$	98,180		$	110,166		$	45,968		$	62,366		$	78,399
Working capital surplus (deficit)			(728,982)			(651,460)			(812,698)			(651,922)			(546,147)
Property and equipment, net			8,965,023			8,380,628			8,733,327			8,035,929			7,228,331
Total assets			21,399,452			20,678,610			21,129,363			19,817,809			17,915,876
Long-term debt and notes payable			9,283,810			8,337,178			8,811,104			8,072,928			6,724,771
Total equity			7,921,218			8,353,657			8,245,381			7,860,354			7,697,781

	As of June 30, 2026
	Actual			As Adjusted
	(in thousands of U.S. dollars)
Cash and equivalents		$	98,180		$
Long-term debt and notes payable:
Revolving Credit Agreement(1)			2,274,994
Existing senior notes			7,051,850			7,051,850
Notes offered hereby(2)			—
Notes payable to sellers and other third parties, finance leases			37,440			37,440
Total long-term debt and notes payable		$	9,364,284		$	9,364,284
Equity:
Common shares		$	2,171,955		$	2,171,955
Additional paid-in-capital			389,514			389,514
Accumulated other comprehensive loss			(178,647)			(178,647)
Retained earnings			5,538,396			5,538,396
Total equity			7,921,218			7,921,218
Total capitalization		$	17,285,502		$	17,285,502

	Six Months Ended June 30,						Year Ended December 31,
	2026			2025			2025			2024			2023
	(in thousands of U.S. dollars)
Net income attributable to Waste Connections		$	515,742		$	531,787		$	1,076,557		$	617,573		$	762,800
Plus (less): Net income (loss) attributable to noncontrolling interests			—			—			—			(1,003)			26
Plus: Income tax provision			151,546			170,348			341,359			146,363			220,675
Plus: Interest expense			178,922			163,626			334,551			326,804			274,642
Less: Interest income			(7,239)			(4,084)			(12,139)			(11,607)			(9,350)
Plus: Depreciation and amortization			640,626			597,606			1,232,106			1,163,769			1,003,211
Plus: Closure and post-closure accretion			20,619			23,816			47,955			29,774			19,605
Plus: Impairments and other operating items			138,050			10,471			109,709			613,012			238,796
Plus (less): Other expense (income), net			(37,337)			(11,922)			(30,154)			(10,471)			(12,481)
Adjustments:
Plus: Transaction-related expenses(1)			9,948			15,943			24,178			26,059			10,653
Plus (less): Fair value changes to certain equity awards(2)			(1,269)			1,036			433			1,592			(1,726)
Plus: Executive separation costs(3)			—			—			—			—			16,105
Adjusted EBITDA		$	1,609,608		$	1,498,627		$	3,124,555		$	2,901,865		$	2,522,956
Adjusted EBITDA as a % of Revenues			32.6%			32.3%			33.0%			32.5%			31.5%