Company: WCN
Filing Date: 2025-05-30
Form Type: 424B5
Source: 0001104659-25-054854
Chunk: 3

Company: Waste Connections, Inc.
Filing Date: 2025-05-30
Form: 424B5
Chunk 3
---
 with the operation of our business. This prospectus supplement may also contain trademarks, service marks and trade names of third parties, which are the property of their respective owners. Our use or display of third parties’ trademarks, service marks or trade names in this prospectus supplement is not intended to, and does not imply, a relationship with or endorsement or sponsorship by us. Solely for convenience, the trademarks, service marks and trade names referred to in this prospectus supplement may appear without the ® , ™ or SM symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent permitted under applicable law, our rights or the rights of the applicable licensor to such trademarks, service marks and trade names.

<div align='center'>S-ii</div>

TABLE OF CONTENTS

### FORWARD-LOOKING STATEMENTS
Certain statements included and incorporated by reference in this prospectus supplement are “forward-looking” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act, the Private Securities Litigation Reform Act of 1995 or in releases made by the Securities and Exchange Commission (the “SEC”). Such forward-looking statements include, among others:

•

statements regarding our landfills, including capacity, duration, special projects, demand for and pricing of recyclables, estimated closure and post-closure liabilities, landfill alternatives and related capital expenditures, operating expenses, leachate and the elevated temperature landfill (ETLF) event at the Chiquita Canyon Landfill;

•

discussion of competition, loss of contracts, price increases and additional exclusive and/or long-term collection service arrangements;

•

forecasts of cash flows necessary for operations and free cash flow to reduce leverage as well as our ability to draw on our credit facility and access the capital markets to refinance or expand;

•

statements regarding our ability to access capital resources or credit markets;

•

plans for, and the amount of, certain capital expenditures for our existing and newly acquired properties and equipment;

•

statements regarding fuel, oil and natural gas demand, prices, and price volatility;

•

assessments of regulatory developments and potential changes in environmental, health, safety and tax laws and regulations; and

•

other statements on a variety of topics such as inflation, credit risk of customers, seasonality, labor/ pension costs and labor union activity, employee retention costs, operational and safety risks, acquisitions, dividends, compliance with applicable laws and regulations, litigation developments and results