Clean Harbors Announces Record Second Quarter Revenues.

Business Editors

BRAINTREE, Mass.--(BUSINESS WIRE)--July 25, 2001

Clean Harbors, Inc. ("Clean Harbors") (Nasdaq: CLHB), a leading provider of environmental services throughout the United States and Puerto Rico, today announced its results for its second quarter ended June 30, 2001.

The company reported record revenues for the second quarter of 2001 of $62,300,000, compared with $62,242,000 for the same quarter of 2000. Revenues increased despite fewer large event opportunities in the second quarter of 2001, reflecting solid gains in the company's base customer business. Net income for the second quarter of 2001 was $2,389,000 or $0.18 per diluted share, compared with net income of $3,639,000, or $0.32 per diluted share for the same quarter of the prior year. The reduction in net income reflects the lower level of higher-margin event business and $340,000 in nonrecurring selling, general and administrative costs related to the refinancing of the Company's long-term debt.

First half revenues for 2001 were $114,118,000, compared with $114,979,000 for the same period in 2000. Net income for the first six months of 2001 was $1,357,000, or $0.09 per diluted share, compared with net income of $2,199,000, or $0.18 per diluted share for the same period in 2000.

"We are pleased to have delivered record revenue performance this quarter in the face of difficult economic conditions," stated Alan S. McKim, Chairman and CEO. "This points to the underlying strength of our core business, which matched last year's very strong second-quarter revenues despite fewer large emergency response events in 2001. Clean Harbors today is in the strongest competitive position in our history, and we are receiving numerous inquiries from large potential customers looking for a stable partner to provide environmental and waste management solutions for the future."

"During the quarter, we completed a number of initiatives which continue to strengthen our position in the marketplace," continued McKim. "We secured $86 million in new funding to refinance our long-term debt and support our growth initiatives. The company opened five new locations in growing markets and strengthened our capabilities in the vital New York/New Jersey marketplace. We also furthered our industry-leading technology advantage with the roll out of our flagship Internet product, CHOICE Online, which is now used by more than 1,000 customers."

About Clean Harbors, Inc.

Clean Harbors, Inc. provides a wide range of environmental and waste management services to a diversified customer base including a majority of the Fortune 500 companies, thousands of smaller private entities and numerous governmental agencies. Within its national footprint, the Company currently has service and sales offices located in 27 states and Puerto Rico, and operates 12 waste management facilities strategically located throughout the country. For more information, visit our Website at www.cleanharbors.com

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, and involve risks and uncertainties. These forward-looking statements are generally identifiable by use of the words "believes," "expects," "intends," "anticipates," "plans to," "estimates," "projects," or similar expressions. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those reflected in these forward-looking statements. Readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management's opinions only as of the date hereof. The Company undertakes no obligation to revise or publicly release the results of any revision to these forward-looking statements. Information on the potential factors that could affect the Company's actual results of operations is included in its filings with the Securities and Exchange Commission, including but not limited to its Annual Report on Form 10-K for the fiscal year ended December 31, 2000.

                          CLEAN HARBORS, INC

                 CONSOLIDATED STATEMENTS OF OPERATIONS
                               Unaudited
                 (in thousands, except per share data)

                        Three Months Ended         Six Months Ended
                              June 30,                 June 30,
                          2001        2000        2001         2000

Revenues               $  62,300   $  62,242   $ 114,118    $ 114,979

Cost of revenues          43,110      42,795      81,561       81,904

Selling, general and
 administrative
 expenses                 11,362      10,679      21,142       20,864
Depreciation and
 amortization              2,759       2,674       5,548        5,179

Income from operations     5,069       6,094       5,867        7,032

Interest expense, net      2,462       2,315       4,590        4,603

Income before provision
 for income taxes          2,607       3,779       1,277        2,429
Provision for income
 taxes                       218         140         (80)         230

            Net income $   2,389   $   3,639   $   1,357    $   2,199


Diluted earnings per
 share                 $    0.18   $    0.32   $    0.09    $    0.18

Weighted average common
 shares outstanding
 plus potentially
 dilutive common shares   12,703      11,107      12,052       11,138