COLUMBIA, Mo. - Ameren Missouri has issued a safety advisory following recent updates to Missouri law, emphasizing the critical importance of contacting Missouri 811 before any excavation projects to prevent accidents and ensure public safety. The updated law, taking effect on August 28, 2025, mandates that excavators notify 811 at least two business days before beginning a project, and complete their work within 21 days. If work extends beyond this period, a new 811 ticket is required, even if previous marks are still visible. In the event of damage to a natural gas facility, federal law requires immediate cessation of all excavation activities, evacuation of the area, and contacting 911 to report the incident. Ameren Missouri stresses that these steps are crucial for maintaining the integrity of underground infrastructure and preventing service disruptions or injuries.