Ever septic tank I've had was concrete.
Jun 3, 2019 #31 Rhodie Ranch Garden Master Joined Nov 19, 2009 Messages 3,525 Reaction score 5,726 Points 333 Location Southern Washington State, 8b Ever septic tank I've had was concrete.
Jun 7, 2019 #32 baymule Garden Master Joined Mar 20, 2011 Messages 18,386 Reaction score 34,851 Points 457 Location Trinity County Texas We have 2 septic tanks that are plastic. Sorry folks, I'm not crawling in either of them.