Clean Harbors — Jul 30, 2025 release

Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com An itemized reconciliation between reported GAAP net cash from operating activities and adjusted free cash flow is as follows (in thousands): Three Months Ended Six Months Ended June 30, 2025 June 30, 2024 June 30, 2025 June 30, 2024 Net cash from operating activities $ 208,040  $ 216,045  $ 209,645  $ 234,594  Additions to property, plant and equipment (90,029) (135,110) (208,724) (273,023) Cash investment in Phoenix Hub 12,436  —  12,436  —  Proceeds from sale and disposal of fixed assets 2,720  3,287  4,063  4,295  Adjusted free cash flow $ 133,167  $ 84,222  $ 17,420  $ (34,134) Adjusted EBITDA Guidance Reconciliation An itemized reconciliation between projected GAAP net income and projected Adjusted EBITDA is as follows (in millions): For the Year Ending December 31, 2025 Projected GAAP net income $383 to $419 Adjustments: Accretion of environmental liabilities 15 to 14 Stock-based compensation 28 to 31 Depreciation and amortization 450 to 440 Interest expense, net 147 to 142 Provision for income taxes 137 to 154 Projected Adjusted EBITDA $1,160 to $1,200 Adjusted Free Cash Flow Guidance Reconciliation An itemized reconciliation between projected GAAP net cash from operating activities and projected adjusted free cash flow is as follows (in millions). The Company excludes significant one-time growth investments, which the Company expects to realize future long-term benefits from, as they are not indicative of free cash flow generation for the current period. For the Year Ending December 31, 2025 Projected net cash from operating activities $775 to $865 Additions to property, plant and equipment (370) to (400) Cash investment in Phoenix Hub 15 to 15 Proceeds from sale and disposal of fixed assets 10 to 10 Projected adjusted free cash flow $430 to $490 Conference Call Information Clean Harbors will conduct a conference call for investors today at 9:00 a.m. (ET) to discuss the information contained in this press release. During the call, management will discuss Clean Harbors’ financial results, business outlook and growth strategy. Investors who wish to listen to the webcast and view the accompanying Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norw