Never enter a septic tank. Toxic gases are produced by the natural treatment and can kill in minutes.
Manholes are for inspections and cleaning and should be covered by something heavy enough to prevent children from opening them.
Keep children and spectators away from the system.
When trying to locate your system, be careful of overhead and underground utilities. Pathogens present in wastewater are also present in the contents of the septic tank. These organisms are capable of spreading infectious diseases.
Use gloves and always wash hands thoroughly before eating, drinking or smoking and change clothes before coming into contact with food and others after being around an onsite system.