State Parks
The quote from the press release, "septic tanks, such as those used at the state parks, may be less effective at containing pollution," is significant. Oregon's coast has more than 80 State Parks. Most of these are day use only, but that's still a lot of public toilets. And you're as likely to find regular colas involved as coffee, a potentially potent combination. There are also a number of well-used campgrounds including both Carl Washburne and Cape Lookout State Parks, among the highest concentration areas mentioned in the article.