In wastewater collections, which part is associated with the most injuries?

• A. Tools falling on you
• B. Electrical hazards
• C. Incorrect trench safety shoring
• D. Heavy equipment

Answer: (C)

Trench cave-ins are the primary safety concern in wastewater collection work. The soil around a trench can give way suddenly if it’s loose, wet, or disturbed, burying or crushing workers who are inside or near the trench. Without a proper protective system—shoring, shielding, or sloping—the risk of a wall collapse is high, and injuries can be severe or fatal. Using the correct protective measures and maintaining them reduces this risk substantially, which is why the option describing lacking or improper trench safety shoring best explains the most injuries. Other hazards like tools falling, electrical hazards, or operating heavy equipment occur, but they are not the leading cause of injuries in this context.