Maryanne Whitney9:57
Thank you, Ron. In the fourth quarter, we delivered revenue of 2.373 billion. Acquisitions completed since the year-ago period contributed about 58 million of revenue in Q4 net of divestitures, bringing full-year net acquisition contribution to 377 million. Q4 pricing accelerated sequentially to 6.4% and ranged from about 3.7% in our mostly exclusive market Western region to over 7% in our competitive markets. Reported volume, down 2.7%, was in line with prior quarters and continued to reflect the combined impacts of intentional shedding, price-volume trade-off, and ongoing weakness in the more cyclically driven elements of the business. Looking at year-over-year results in the fourth quarter on a same-store basis, roll-off pulls were down 2% and total landfill tons were up 3% on MSW and special waste both up 4%, while construction and demolition debris or C&D was down 4%.
For the full year, C&D tons were down 5% year-over-year, bringing tons down about 15% from 2023. Special waste, on the other hand, was up 7% for the full year 2025 following declines in two of the last three years. And finally, full-year 2025 MSW tons were up 3% in part as a result of our purposeful increase in internalization in the Northeast and in certain Texas markets. We are encouraged by the consistency of results in 2025 and macro indicators that suggest improving underlying dynamics in the broader economy, but haven't factored in a material pickup in our expectations for 2026.
Adjusted EBITDA for Q4, as reconciled in our earnings release, was up 8.7% year-over-year to 796 million or 33.5% of revenue, up 110 basis points year-over-year. In Q4, we lapped the initial wind-down of operations at Chiquita Canyon Landfill, as well as the toughest year-over-year commodity comparisons, both of which had masked the strength of underlying margin expansion on a reported basis. As anticipated, the outsized benefits from operational improvements that had been contributing all year were more visible in Q4. Along those lines, we were encouraged to see benefit from risk management costs, which up until Q4 had been a headwind to reported results.
Looking at the full year 2025, adjusted EBITDA of 3.125 billion was up 7.7% year-over-year with adjusted EBITDA margin of 33%, up 50 basis points. Normalizing for Chiquita and lower commodities, adjusted EBITDA margin exceeded 33.6% as expected.
Moving next to adjusted free cash flow. Our 2025 adjusted free cash flow of 1.26 billion was largely in line with our expectations and reflects underlying conversion of adjusted EBITDA of approximately 50%. The strength of our free cash flow generation largely overcame higher than expected cash flow impacts from Chiquita, which totaled approximately 200 million. Capital expenditures of 1.194 billion were in line with our expectations, including RNG project spend of about 100 million. Our RNG spend for the projects noted will be completed in 2026 and Chiquita outlays are expected to step down, setting up higher free cash flow conversion, which has been factored into our 2026 outlook, which I will now review. Before I do, we'd like to remind everyone once again that actual results may vary significantly based on risks and uncertainties outlined in our safe harbor statement and filings we've made with the SEC and the Securities Commissions or similar regulatory authorities in Canada. We encourage investors to review these factors carefully. Our outlook assumes no change in the current economic environment. Our outlook also excludes any impact from additional acquisitions that may close during the remainder of the year and expensing of transaction-related items during the period.
Revenue in 2026 is estimated in the range of 9.9 billion to 9.950 billion. For solid waste collection, hauling, and disposal, we expect organic growth in the range of 3.5 to 4% driven by core pricing of 5 to 5.5% with expected yield of approximately 4%, implying volumes flat to down about half a percentage point. Acquisition revenue contribution of about 125 million reflects deals closed to date. Commodity-related revenue reflects recent values and EMP waste revenues are expected to be flattish year-over-year.
On that basis, adjusted EBITDA in 2026, as reconciled in our earnings release, is expected in the range of 3.30 billion to 3.325 billion. Adjusted EBITDA margin in the range of 33.3% to 33.4%, up 30 to 40 basis points year-over-year, reflects a commodity-related drag of 20 to 30 basis points. As noted, incremental acquisition activity, any improvement in the underlying economy, or increase in commodities would provide upside to our 2026 outlook.
Depreciation and amortization expense in 2026 is estimated at about 13.1% of revenue, including amortization of intangibles of about 195 million or 57 cents per diluted share net of taxes. Interest expense is estimated at approximately 330 million and our effective tax rate for 2026 is estimated to be approximately 24.5% with some quarterly variability.
Adjusted free cash flow in 2026, as reconciled in our earnings release, is expected to increase by double-digit percentages to a range of 1.4 billion to 1.45 billion. Capex estimated at 1.25 billion includes an aggregate of about 100 million for RNG and recycling projects and our adjusted free cash flow outlook also reflects 100 million to 150 million impact from closure-related outlays at Chiquita Canyon. Normalizing for both non-core impacts, 2026 adjusted free cash flow reflects conversion of approximately 50% of EBITDA or approximately 1.7 billion.
While not providing specific expectations for revenue and EBITDA by quarter, we would offer the following high-level framework. In solid waste, we would expect a typical seasonal cadence and related margin progression in 2026, keeping in mind the recent outsized weather events across several geographies impacting Q1. Looking specifically at Q4, we would note the toughest year-over-year comparisons given our outperformance in 2025. And finally, for recycled commodities, a reminder that the toughest comparisons would be in the first half of the year.