Exhibit 99.1

CALGON CARBON ANNOUNCES FOURTH QUARTER RESULTS

PITTSBURGH, PA — February 23, 2011 — Calgon Carbon Corporation (NYSE: CCC) announced results for the fourth quarter and year ended December 31, 2010.

The company reported net income of $12.5 million, or $0.22 per common share on a fully diluted basis, for the fourth quarter of 2010 which included $2.8 million of income from discrete tax items, including the release of a valuation allowance on foreign tax credits. Net income for the fourth quarter of 2009 was $13.2 million or $0.23 per common share on a fully diluted basis.

Net sales for the fourth quarter of 2010 were $131.5 million, an increase of 18.8% versus fourth quarter 2009 sales of $110.7 million. For the fourth quarter of 2010, the net effect on sales from acquisitions completed in 2010 was $18.8 million. Currency translation had a $1.8-million negative impact on sales for the fourth quarter of 2010, due to the stronger dollar.

For the fourth quarter of 2010, sales for the Activated Carbon and Service segment increased by 20.7% versus the fourth quarter of 2009, including 17.2% from the acquisitions mentioned above. The increase from the company’s traditional businesses was primarily due to higher demand for activated carbon products in the potable water and respirator markets. This was partially offset by a decline in demand for activated carbon products in the food market.

Equipment sales increased by 13.3% versus the fourth quarter of 2009, due to revenue recognition from ballast water treatment systems. Sales from the company’s traditional equipment businesses declined slightly. The 27.9% decline in Consumer sales was attributable to lower demand for activated carbon cloth and PreZerve^® products.

Net sales less the cost of products sold as a percentage of net sales for the fourth quarter of 2010 was 33.0%, versus 42.2% for the fourth quarter of 2009. Results for the fourth quarter of 2009 included $2.4 million related to the receipt of, or estimated refunds of, tariff deposits. Results for the fourth quarter of 2009 also benefited from

unusually low repair and maintenance expense. Sales from Calgon Carbon Japan and Hyde Marine, whose margins were lower than the corporate average, had an adverse impact on margins in the fourth quarter of 2010.

Selling, administrative and research expenses for the fourth quarter of 2010 were 7.3% higher than for the comparable period of 2009, due to on-going expenses related to acquisitions completed in the first quarter of 2010. For the fourth quarter of 2010 SG&A as a percentage of revenue was 16.4% as compared to 18.2% for the comparable period in 2009.

Net sales for the year ended December 31, 2010 were $482.3 million, versus $411.9 million for 2009, an increase of 17.1%. For the year, foreign currency translation had a $3.2 million negative impact on sales due to the stronger U.S. dollar.

Net income for the year ended December 31, 2010 was $34.9 million versus $39.2 million for the comparable period of 2009. The 2010 results included a $12.0 million pre-tax charge related to settlements of lawsuits and environmental related matters. The results for the year ended December 31, 2010 also included $3.8 million from discrete tax items including the release of a valuation allowance on foreign tax credits. The 2009 results included $4.8 million from the release of valuation allowance on foreign tax credits.

Fully diluted earnings per share for the year ended December 31, 2010 were $0.61. For 2009, earnings per share on a fully diluted basis were $0.69.

Calgon Carbon’s board of directors did not declare a quarterly dividend.

Commenting on the results, John Stanik, Calgon Carbon’s chairman, president and chief executive officer, said, “We continue to improve our top-line growth which included contributions from our most recent acquisitions and Calgon Carbon’s traditional businesses. While the decline in the fourth quarter margins was anticipated given our recent acquisitions, we expect to see margin improvement going forward as we continue to integrate Calgon Carbon Japan and implement global price increases that were previously announced.

Excluding the impact of non-recurring legal and environmental expenses, the company’s 2010 performance represents a significant improvement year-over-year and positions Calgon Carbon for continued growth in 2011 and beyond.”

For more information about Calgon Carbon’s leading activated carbon and ultraviolet technology solutions for municipalities and industries, visit www.calgoncarbon.com.

Calgon Carbon Corporation, headquartered in Pittsburgh, Pennsylvania, is a global leader in services and solutions for making water and air safer and cleaner.

This news release contains historical information and forward-looking statements. Forward-looking statements typically contain words such as “expect,” “believe,” “estimate,” “anticipate,” or similar words indicating that future outcomes are uncertain. Statements looking forward in time, including statements regarding future growth and profitability, price increases, cost savings, broader product lines, enhanced competitive posture and acquisitions, are included in the company’s most recent Annual Report pursuant to the “safe harbor” provision of the Private Securities Litigation Reform Act of 1995. They involve known and unknown risks and uncertainties that may cause the company’s actual results in future periods to be materially different from any future performance suggested herein. Further, the company operates in an industry sector where securities values may be volatile and may be influenced by economic and other factors beyond the company’s control. Some of the factors that could affect future performance of the company are higher energy and raw material costs, costs of imports and related tariffs, labor relations, capital and environmental requirements, changes in foreign currency exchange rates, borrowing restrictions, validity of patents and other intellectual property, and pension costs. In the context of the forward-looking information provided in this news release, please refer to the discussions of risk factors and other information detailed in, as well as the other information contained in the company’s most recent Annual Report.

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Calgon Carbon Corporation
Condensed Consolidated Statement of Income
(Dollars in thousands except per share data)
(Unaudited)

		Quarter Ended								Twelve Months Ended
		December 31,								December 31,
		2010				2009				2010				2009
Net Sales		$	131,469			$	110,692			$	482,341			$	411,910
Cost of Products Sold			88,139				63,975				316,884				266,597
Depreciation and Amortization			6,253				5,692				22,082				18,130
Selling, Administrative & Research			21,574				20,110				85,071				72,789
Litigation and Other Contingencies			500				711				12,000				961
			116,466				90,488				436,037				358,477
Income from Operations			15,003				20,204				46,304				53,433
Interest — Net			233				149				323				173
Gain on Acquisitions			—				—				2,666				—
Loss on debt extinguishment			—				—				—				(899	)
Other Expense — Net			(210	)			(515	)			(1,395	)			(3,089	)
Income From Operations Before Income Tax and Equity in Income (Loss) from Equity Investments			15,026				19,838				47,898				49,618
Income Tax Provision			2,520				6,567				13,160				11,754
Income from Operations Before Equity in Income (Loss) from Equity Investments			12,506				13,271				34,738				37,864
Equity in Income (Loss) from Equity Investments			—				(43	)			112				1,295
Net Income		$	12,506			$	13,228			$	34,850			$	39,159
Net Income per Common Share
Basic		$	.22			$	.24			$	.62			$	.72
Diluted		$	.22			$	.23			$	.61			$	.69
Weighted Average Shares Outstanding (Thousands)
Basic			56,020				55,622				55,867				54,757
Diluted			56,816				56,654				56,742				56,529

Calgon Carbon Corporation

Segment Data:

Segment Sales		4Q10				4Q09				YTD 2010				YTD 2009
Activated Carbon and Service			116,879				96,820				427,713				358,196
Equipment			12,615				11,132				46,010				43,916
Consumer			1,975				2,740				8,618				9,798
Total Sales (thousands)		$	131,469			$	110,692			$	482,341			$	411,910

Segment
Operating Income (loss)*		4Q10				4Q09				YTD 2010				YTD 2009
Activated Carbon and Service			23,446				24,988				69,584				68,717
Equipment			1,112				707				1,990				2,584
Consumer			(3,302	)			201				(3,188	)			262
Income from Operations (thousands)		$	21,256			$	25,896			$	68,386			$	71,563

Calgon Carbon Corporation
Condensed Consolidated Balance Sheet
(Dollars in thousands)
(Unaudited)

		December 31,				December 31,
		2010				2009
Assets
Current assets:
Cash and cash equivalents		$	33,992			$	38,029
Restricted cash			1,173				5,556
Receivables			94,354				64,304
Inventories			101,693				84,587
Other current assets			40,836				29,369
Total current assets			272,048				221,845
Property, plant and equipment, net			186,834				155,100
Other assets			42,681				48,773
Total assets		$	501,563			$	425,718
Liabilities and Shareholders’ Equity
Current liabilities:
Short-term debt		$	21,442			$	—
Current portion of long-term debt			3,203				—
Other current liabilities			80,529				62,021
Total current liabilities			105,174				62,021
Long-term debt			3,721				—
Other liabilities			49,430				56,611
Total liabilities			158,325				118,632
Redeemable Non-Controlling Interest			274				—
Total shareholders’ equity			342,964				307,086
Total liabilities and shareholders’ equity		$	501,563			$	425,718