Identify the source of the odor. If you had a pipe burst or another plumbing issue that was fixed, you may still have objects around your home that were compromised during the incident. If there was no precipitating incident and your home suddenly smells, finding the source can be even harder.
Determine which rooms or areas of your home smell most strongly of the septic odor by shutting all doors, windows and vents to the rooms for one hour, and smelling each room. Walk around the entire room to determine if one side of the room smells more strongly than the other.
Make a list of, and inspect the movable objects around the room that may have been affected. For instance, if you had a plumbing incident and moved plants, furniture or light fixtures from the area of the incident, make sure to inspect these objects for stains, water damage or fecal matter that may have compromised the object. Smell carpeting, drapes and window shades, too.
Open the vents and smell them, if you cannot locate the source of the smell. Then, open the windows and smell. If the scent is coming from outside your home, you will need to inspect the outdoors. If you still cannot find the source of the smell, you need to call a professional.
Clean any compromised object thoroughly with bleach diluted with water. If the item is cloth or can be bleached easily, use vinegar diluted with water. Wear gloves to protect your hands. If drapes or carpets have been compromised, clean them. If you are unsure how, consult a professional drycleaner or carpet cleaner.
Isolate all compromised objects in a specific room, or area of the house, until they are clean and dry.
Open windows to clear the room of any lingering odor. Use air freshener if you wish.