Exhibit 99.1 GFL Environmental Inc. Unaudited Interim Condensed Consolidated Financial Statements For the three months ended March 31, 2024 F-1 GFL Environmental Inc. Unaudited Interim Condensed Consolidated Statements of Operations and Comprehensive Loss (In millions of dollars except per share amounts) Three months ended March 31, Notes 2024 2023 Revenue 10 $1,801.4$ 1,799.1 Expenses Cost of sales 1,504.2 1,554.6 Selling, general and administrative expenses 275.4 214.5 Interest and other finance costs 8 ...