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EXHIBIT 21
SIGNIFICANT SUBSIDIARIES OF CLEAN HARBORS, INC.
|
| State of Organization |
| Other Business Names |
CH International Holdings, Inc. |
| Delaware |
| N/A |
CH Canada Holdings Corp |
| Nova Scotia |
| N/A |
CH Canada GP, Inc. |
| Canada |
| N/A |
Clean Harbors Environmental Services, Inc. |
| Massachusetts |
| N/A |
Clean Harbors of Natick, Inc. |
| Massachusetts |
| N/A |
Clean Harbors of Braintree, Inc. |
| Massachusetts |
| N/A |
Clean Harbors Services, Inc. |
| Massachusetts |
| N/A |
Clean Harbors of Baltimore, Inc. |
| Pennsylvania |
| N/A |
Clean Harbors of Connecticut, Inc. |
| Connecticut |
| N/A |
Clean Harbors Kingston Facility Corporation |
| Massachusetts |
| N/A |
Harbor Management Consultants, Inc. |
| Massachusetts |
| N/A |
Murphy’s Waste Oil Service, Inc. |
| Massachusetts |
| N/A |
Spring Grove Resource Recovery, Inc. |
| Delaware |
| N/A |
Clean Harbors Lone Star Corp. |
| Delaware |
| N/A |
Clean Harbors Disposal Services, Inc. |
| Delaware |
| N/A |
Clean Harbors of Texas, LLC |
| Delaware |
| N/A |
Clean Harbors Canada, Inc. |
| New Brunswick |
| N/A |
Clean Harbors Canada L.P. |
| Ontario |
| N/A |
Clean Harbors Mercier, Inc. |
| Quebec |
| N/A |
Clean Harbors Quebec, Inc. |
| Quebec |
| N/A |