SeptiCAD

SeptiCAD - CAD drafting software

Download SeptiCAD v3.32 (April 2012)
[Bricscad/AutoCAD required]

Download a 30-Day Trial of Bricscad
Email HHE-200s as PDFs using PDF reDirect
Capture images of anything on the screen with MWSnap

Feel free to contact SeptiCAD about designing a version for your purposes (other states, engineered designs, stormwater, etc).