The new Oregon Graywater program coordinator, Pat Heins, shared an updated listing of the permits - 28 total and depicted on the map prepared using Google Maps. Nearly all are a Tier 1 variety, with one Tier 2 permit as described here. Pat reports "We have had a sharp increase in inquiries for this permit this last year. Based on these calls it seems the biggest problem currently, is obtaining approval from the local building codes."
It is good to see the geography of greywater expanding in Oregon, especially on the east side of the Cascades. I wish I was part of the *hydroherd* (not to be confused with Hydro Herd), but was culled a few years back for reusing too little graywater with my Hughie Sink.