{"schema_version":"secwatch.filing_event.v1","accession":"0001104659-23-122471","form_type":"8-K","ticker":"WCN","cik":"0001318220","company_name":"Waste Connections, Inc.","filed_at":"2023-11-30T23:59:59+00:00","discovered_at":"2026-05-14T18:03:28.591007+00:00","generated_at":"2026-06-07T19:48:32.277344+00:00","sec_items":["8.01"],"event_type":"other_material","sentiment":"negative","materiality_score":0.75,"calibrated_materiality_score":0.75,"confidence":"high","headline":"Waste Connections expects $160M liability increase from landfill event at Chiquita Canyon","bullets":["Increase of ~$160M in landfill closure and post-closure liabilities for FY2023 Form 10-K.","Costs: ~$30M in Q3/Q4 2023, $75M in 2024, $40M in 2025.","Attributed to Elevated Temperature Landfill Event (ETLF) at Chiquita Canyon Landfill, Southern California.","Non-recurring, site-specific; additional costs expected substantially realized by end of 2025."],"urls":{"canonical":"https://secwatch.observer/filing/0001104659-23-122471","json":"https://secwatch.observer/filing/0001104659-23-122471.json","markdown":"https://secwatch.observer/filing/0001104659-23-122471.md","text":"https://secwatch.observer/filing/0001104659-23-122471.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1318220/000110465923122471/0001104659-23-122471-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1318220/000110465923122471/tm2331859d1_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-07T19:48:32.277344+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}