---
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"
generated_at: "2026-06-07T19:48:32.277344+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Waste Connections expects $160M liability increase from landfill event at Chiquita Canyon

## Summary
- 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.

## SEC filing metadata
- 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
- event_type: other_material
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 8.01
- 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

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-23-122471
- JSON: https://secwatch.observer/filing/0001104659-23-122471.json
- Plain text: https://secwatch.observer/filing/0001104659-23-122471.txt

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