Never enter a tank.
You would probably be dead from noxious gases before you reached the bottom of the septic tank. Extreme care should be taken even when inspecting or just looking in the tank.

Keep the tank lid secure.
Secure and regularly inspect lids to prevent deliberate or accidental entry. Keep children and pets away from the tank during servicing and cleaning.

Prevent electric shock and explosion.
Explosive methane and other gases are produced by your system. Do not smoke, use electric lights or power tools, or allow flame or sparks near your septic tank and treatment field.

Avoid infectious diseases.
Contact with the liquid, sludge and scum in the tank may cause infectious diseases. Wash thoroughly after any contact with your system.

Mark the system location and keep heavy vehicles and equipment off.
Do not park, drive or operate any heavy vehicle on your tank or treatment field.

Keep fertilizers and flammables out of the system.
The risk of explosion occurs if fertilizers or petroleum products are placed in your system.

Smell of sewer gas in your home.
If you can smell sewer gas in your home, call a plumber. If the smell of noxious gases is strong, evacuate the building. A sewer gas small outside is a nuisance but normally poses no risk.