"Colorado 811 is committed to protecting Colorado's underground infrastructure, promoting excavator and public safety education, and encouraging compliance with applicable laws at the best overall value to all stakeholders."
State law says you must call Colorado 811 two full business before you dig in your yard. The locating service is free. If you fail to do so and you damage utility lines, you will be charged for repairs. Wait until all utilities have marked the area before you dig. Then, follow the instructions on each locate sheet carefully to complete your project safely.