# CLEAN HARBORS INC (CLH) — merger/definitive [pending]
Source: SEC API (secapi.ai) · situation sit_fd628a3c35d0c82d0837 · retrieved 2026-08-16T21:05:05.964Z

## Overview
Clean Harbors, Inc. is North America's leading provider of environmental and industrial services, including hazardous waste management, emergency spill response, industrial cleaning and maintenance, and recycling services.

Clean Harbors, Inc. (NYSE: CLH) entered into a definitive agreement to acquire EnviroServe, a national provider of environmental and waste management services, from an affiliate of One Rock Capital Partners, LLC for $470 million in cash. The acquisition is expected to close in the second half of 2026, subject to regulatory approval and other customary closing conditions. EnviroServe, headquartered in Sandy, Utah, operates a network of 40 locations with permits in 48 states and is expected to generate approximately $27 million in annual Adjusted EBITDA on approximately $250 million of revenues. Clean Harbors expects to realize approximately $25 million in cost synergies over the first two years, resulting in a post-synergy acquisition multiple of approximately 9x Adjusted EBITDA.

## Terms
- Counterparty: One Rock Capital Partners, LLC (affiliate) · Deal value: $470.0M · Consideration: cash

## Key dates
- Announced 2026-08-12

## Timeline
- 2026-08-12 · 8-K (0000822818-26-000037): 8-K - CLEAN HARBORS INC — *Clean Harbors, Inc. is North America's leading provider of environmental and industrial services, including hazardous waste management, emergency spill response, industrial cleaning and maintenance, and recycling services.* Clean Harbors, Inc. (NYSE: CLH) entered into a definitive agreement to acquire EnviroServe, a national provider of environmental and waste management services, from an affiliate of One Rock Capital Partners, LLC for $470 million in cash. The acquisition is expected to close in the second half of 2026, subject to regulatory approval and other customary closing conditions. EnviroServe, headquartered in Sandy, Utah, operates a network of 40 locations with permits in 48 states and is expected to generate approximately $27 million in annual Adjusted EBITDA on approximately $250 million of revenues. Clean Harbors expects to realize approximately $25 million in cost synergies over the first two years, resulting in a post-synergy acquisition multiple of approximately 9x Adjusted EBITDA.
  https://www.sec.gov/Archives/edgar/data/822818/0000822818-26-000037.txt

## Citations
- 0000822818-26-000037 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=&dateb=&owner=include&count=40&search_text=000082281826000037