---
schema_version: "secwatch.filing_event.v1"
accession: "0000911177-24-000120"
form_type: "8-K"
ticker: "CWST"
cik: "0000911177"
company_name: "CASELLA WASTE SYSTEMS INC"
filed_at: "2024-12-10T23:59:59+00:00"
generated_at: "2026-05-29T05:25:36.191101+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Casella Waste Systems: Ontario County landfill to close by end of 2028; no material impact expected

## Summary
- Ontario County Board of Supervisors approved motion to close Ontario Landfill at end of 2028 upon expiration of 25-year OML.
- Company expects to redirect waste to other landfills in New York and Pennsylvania before closure.
- Casella has already amortized costs and accrued asset retirement obligations based on assumed closure at OML expiry.
- Company does not believe the closure will materially affect results of operations or financial condition.

## SEC filing metadata
- accession: 0000911177-24-000120
- form_type: 8-K
- ticker: CWST
- cik: 0000911177
- company_name: CASELLA WASTE SYSTEMS INC
- filed_at: 2024-12-10T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/911177/000091117724000120/0000911177-24-000120-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/911177/000091117724000120/cwst-20241205.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000911177-24-000120
- JSON: https://secwatch.observer/filing/0000911177-24-000120.json
- Plain text: https://secwatch.observer/filing/0000911177-24-000120.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.