We just finished building our vermifilter septic system, and I am sharing in case others are interested.
Here is a blog post about our permitting process.
Here is another blog post about our build.
The system is still months away from being in operation, since we haven't plumbed our house yet... but we will be taking water quality data quarterly for at least the first year to assess the effluent coming out of the tank. We were required to install a drainfield for the purposes of our permit, but are also eager to see if the effluent is suitable for irrigation.