How To Find Your Septic Tank Cap. Septic smells around the tank. Septic tank lids are typically green or black plastic;
You can do this by using a probe or a metal rod of some sort. On most units the cap sits flush on top of the tank and may have two wire handles. Continue digging until you locate a seam in the tank lid, then remove enough dirt to expose the entire seam.
If your septic tank is not properly ventilated, there is a good chance that problems are going to occur.
More often than not, you are likely to spot an outdoor sewer cleanout outside your bathroom. You can use a metal probe to locate its edges and mark the perimeter. If your septic tank is not properly ventilated, there is a good chance that problems are going to occur. The important thing to know is that your outlet port is parallel with your inlet port.