Exhibit 99.1 FOR IMMEDIATE RELEASE CASELLA WASTE SYSTEMS, INC. ANNOUNCES THIRD QUARTER 2025 RESULTS RUTLAND, VERMONT (October 30, 2025) — Casella Waste Systems, Inc. (NASDAQ: CWST), a regional solid waste, recycling and resource management services company, today reported its financial results for the three and nine-month periods ended September 30, 2025. Key Highlights: "We reported another quarter of record performance across our key financial metrics as we continue to execute on our operating plans and d ...