Clean Harbors Announces $800 Million Senior Notes Offering

NORWELL, Mass.–(BUSINESS WIRE)–Clean Harbors, Inc. (“Clean Harbors”) (NYSE: CLH) announced today that
it is commencing a private offering of $800 million of unsecured senior
notes (the “Notes”). Clean Harbors expects that a portion of the Notes
will mature in 2027 and a portion will mature in 2029. Clean Harbors
intends to use the net proceeds of the offering as partial consideration
to purchase any and all of its $845.0 million outstanding 5.125% senior
unsecured notes due 2021 (the “Existing Notes”), which are validly
tendered and not withdrawn in connection with its concurrent tender
offer and consent solicitation for such Existing Notes.

The Notes will be offered in the United States to persons reasonably
believed to be qualified institutional buyers pursuant to Rule 144A
under the Securities Act of 1933, as amended (the “Securities Act”), and
outside the United States pursuant to Regulation S under the Securities
Act. This press release shall not constitute an offer to sell or the
solicitation of an offer to buy, nor shall there be any sale of, the
Notes in any jurisdiction in which such offer, solicitation or sale
would be unlawful prior to registration or qualification under the
securities laws of any such jurisdiction. The Notes will not be
registered under the Securities Act or the securities laws of any other
jurisdiction and may not be offered or sold in the United States absent
registration or an applicable exemption from registration requirements.

About Clean Harbors
Clean Harbors (NYSE: CLH) is North
America’s leading provider of environmental, energy and industrial
services. The Company serves a diverse customer base with over 300,000
customers, including a majority of the Fortune 500, across the chemical,
energy, manufacturing and additional markets, as well as numerous
government agencies. These customers rely on Clean Harbors to deliver a
broad range of services such as end-to-end hazardous waste management,
emergency spill response, industrial cleaning and maintenance, and
recycling services. Through its Safety-Kleen subsidiary, Clean Harbors
also is North America’s largest re-refiner and recycler of used oil and
a leading provider of parts washers and environmental services to
commercial, industrial and automotive customers. Founded in 1980 and
based in Massachusetts, Clean Harbors operates throughout the United
States, Canada, Mexico and Puerto Rico.

Safe Harbor Statement
Any statements contained herein that
are not historical facts are forward-looking statements within the
meaning of the Private Securities Litigation Reform Act of 1995. These
forward-looking statements are generally identifiable by use of the
words “believes,” “expects,” “intends,” “anticipates,” “plans to,”
“estimates,” “projects,” or similar expressions. Such statements may
include, but are not limited to, statements about Clean Harbors’
business outlook and financial guidance and other statements that are
not historical facts. Such statements are based upon the beliefs and
expectations of Clean Harbors’ management as of this date only and are
subject to certain risks and uncertainties that could cause actual
results to differ materially, including, without limitation, those items
identified as “risk factors” in Clean Harbors’ most recently filed Form
10-K and Form 10-Q. Therefore, readers are cautioned not to place undue
reliance on these forward-looking statements. Clean Harbors undertakes
no obligation to revise or publicly release the results of any revision
to these forward-looking statements other than through its various
filings with the Securities and Exchange Commission, which may be viewed
at www.sec.gov.

Contacts

Michael L. Battles
EVP and Chief Financial Officer
Clean
Harbors, Inc.
781.792.5100
InvestorRelations@cleanharbors.com

Jim Buckley
SVP Investor Relations
Clean Harbors, Inc.
781.792.5100
Buckley.James@cleanharbors.com