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Exhibit 21.1

WILLDAN GROUP, INC.

LIST OF SUBSIDIARIES

AS OF DECEMBER 27, 2024

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Name of Entity

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Jurisdiction of
Organization

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1.

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Willdan Electrical of NY, Inc.

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New York

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2.

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Willdan Engineering

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California

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3.

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Willdan Energy Solutions

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California

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4.

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Willdan Financial Services

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California

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5.

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Willdan Lighting & Electric, Inc.

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Delaware

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6.

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Electrotec of NY Electrical Inc.

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New York

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7.

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Public Agency Resources

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California

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8.

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Integral Analytics, Inc.

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Ohio

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9.

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Willdan Energy Co.

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Delaware

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10.

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Energy and Environmental Economics, Inc.

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California

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