Exhibit 21
SUBSIDIARY LIST
(as of February 28, 2014)
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| Company Name | Place of Incorporation |
| Aegion Rehabilitation Services Limited | United Kingdom |
Bayou Coating, LLC1 | Louisiana |
Bayou Perma-Pipe Canada, Ltd.2 | Alberta, Canada |
Bayou Wasco Insulation, LLC 3 | Delaware |
| Brinderson, LP | California |
| Brinderson Constructors, Inc. | California |
| Brinderson Holdings, Inc. | Delaware |
| Brinderson Services, LLC | Delaware |
| Commercial Coating Services International, LLC | Texas |
Corrpower International Limited 4 | Saudi Arabia |
| Corrpro Canada Holdings, Inc. | Delaware |
| Corrpro Canada, Inc. | Alberta, Canada |
| Corrpro Companies Engineering Ltd. | United Kingdom |
| Corrpro Companies Europe Ltd. | United Kingdom |
| Corrpro Companies, Inc. | Ohio |
| Corrpro Companies International, Inc. | Nevada |
| Corrpro Holdings LLC | Delaware |
| CRTS, Inc. | Oklahoma |
Delta Double Jointing, LLC 5 | Delaware |
| Energy & Mining Holding Company, LLC | Delaware |
Fibrwrap Construction Chile S.A. 6 | Republic of Chile |
| Fibrwrap Construction Colombia S.A.S. | Republic of Columbia |
| Fibrwrap Construction Latin America S.A. | Republic of Panama |
| Fibrwrap Construction (M) Sdn Bhd | Malaysia |
Fibrwrap Construction Peru S.A.C. 7 | Republic of Peru |
| Fibrwrap Construction Pte Ltd | Singapore |
| Fibrwrap Construction Services, Inc. | Delaware |
| Fibrwrap Construction Services Ltd. | British Columbia, Canada |
| Fibrwrap Construction Services USA, Inc. | Delaware |
| Fyfe Asia Pte. Ltd. | Singapore |
Fyfe Borneo Sdn Bhd 8 | Brunei |
| Fyfe Co. LLC | Delaware |
| Fyfe International Holdings B.V. | The Netherlands |
| Fyfe (Hong Kong) Limited | Hong Kong |
| Fyfe Japan Co. Ltd. | Japan |
| Fyfe - Latin America S.A. | Republic of Panama |
| Fyfe - Latin America S.A. de C.V. | Republic of El Salvador |
| General Energy Services | California |
Grupo Meltzer Fibrwrap Costa Rica S.A. 9 | Republic of Costa Rica |
| Hockway Middle East FZE | Ras Al Khaimah, UAE |
| Hockway Middle East FZE | Dubai, UAE |
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| INA Acquisition Corp. | Delaware |
| Infrastructure Group Holdings, LLC | Delaware |
| Insitu Envirotech (S.E. Asia) Pte. Ltd. | Singapore |
| Insituform Asia Limited | Hong Kong |
| Insituform Belgium N.V. | Belgium |
| Insituform C.V. | The Netherlands |
| Insituform Cyprus Limited | Cyprus |
Insituform Environmental Techniques Ltd. 10 | Northern Ireland |
| Insituform Europe SAS | France |
| Insituform Holdings B.V. | The Netherlands |
| Insituform Holdings (UK) Limited | United Kingdom |
| Insituform Hong Kong Limited | Hong Kong |
| Insituform Limited Partnership | New Brunswick, Canada |
| Insituform Linings Asia Sdn Bhd | Malaysia |
| Insituform Linings Limited | United Kingdom |
| Insituform Netherlands Holdings, LLC | Delaware |
| Insituform Pacific Pty Limited | Australia |
| Insituform Pipeline Rehabilitation Private Limited | India |
| Insituform Rioolrenovatietechnieken B.V. | The Netherlands |
| Insituform Singapore Pte. Ltd. | Singapore |
| Insituform sp. z o.o. | Poland |
Insituform SPML JV 11 | India |
| Insituform Technologies C.V. | The Netherlands |
| Insituform Technologies Ibérica S.A. | Spain |
| Insituform Technologies Limited | Alberta, Canada |
| Insituform Technologies Limited | United Kingdom |
| Insituform Technologies, LLC | Delaware |
| Insituform Technologies Netherlands B.V. | The Netherlands |
| Insituform Technologies Netherlands Holdings, LLC | Delaware |
| Insituform Technologies USA, LLC | Delaware |
| ITI International Services Canada Ltd. | Alberta, Canada |
| ITI International Services, Inc. | Delaware |
| KA-TE Insituform AG | Switzerland |
| Mississippi Textiles Corporation | Mississippi |
| Ocean City Research Corporation | New Jersey |
PT Fyfe Fibrwrap Indonesia 12 | Indonesia |
| Specialized Fabrics, LLC | Washington |
| Technologie & Art Pte. Ltd. | Singapore |
| The Bayou Companies, LLC | Delaware |
United Pipeline de Mexico S.A. de C.V. 13 | Mexico |
| United Pipeline Middle East, Inc. | Delaware |
| United Pipeline Systems, Inc. | Nevada |
| United Pipeline Systems International, Inc. | Delaware |
| United Pipeline Systems Limited | Alberta, Canada |
| United Pipelines Inversiones Limitada | Chile |
| United Pipelines SRL | Argentina |
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| United Rotolining, LLC | Delaware |
| United Sistemas de Revestimento em Tubulações Ltda. | Brazil |
| United Sistema de Tuberias Limitada | Chile |
United Special Technical Services LLC 14 | Oman |
UPS-Aptec Limited 15 | United Kingdom |
| Video Injection - Insituform SAS | France |
WCU Corrosion Technologies Pte. Ltd. 16 | Singapore |
| Wilson Walton Anti Corrosivos Ltd. | Portugal |
| Wilson Walton Group Ltd. | United Kingdom |
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1 The Bayou Companies, LLC holds a 49% interest in Bayou Coating, LLC. The Bayou Companies, LLC holds a 59% interest in Delta Double Jointing, LLC and Bayou Coating, LLC holds the other 41% interest.
2 United Pipeline Systems Limited holds a 51% interest.
3 Energy & Mining Holding Company, LLC holds a 51% interest.
4 Corrpro Canada, Inc. holds a 70% interest.
5 See Note 1.
6 Fibrwrap Construction Latin America S.A. holds a 55% interest.
7 Fibrwrap Construction Latin America S.A. holds a 51% interest.
8 Fyfe Asia Pte. Ltd. holds a 51% interest.
9 Fibrwrap Construction Latin America S.A. holds a 51% interest.
10 Insituform Technologies Limited (UK) holds a 50% interest.
11 Insituform Technologies, LLC holds a 99.9% interest.
12 Fyfe Asia Pte. Ltd. holds a 55% interest.
13 INA Acquisition Corp. holds a 55% interest.
14 Insituform Technologies Netherlands B.V. holds a 51% interest.
15 United Pipeline Systems International, Inc. holds a 51% interest.
16 Insituform Technologies Netherlands B.V. holds a 49% interest.
