Your statement is not completely accurate. I don’t know about the non attainment zones because I don’t pay attention to what goes on in Houston. I live about an hour’s drive from there and that’s as close as I care to get. However, there is a place in Houston where you can buy it and most, I repeat most, counties surrounding Houston have at least one place you can get it. Now if the web site’s info is not correct, I apologize. Also, I forgot to mention that the place in Houston is not a station but a storefront and probably is $10 gallon. And that’s probably because of the zone thing. Lol
I have never seen a conventional gas station in Harris County with an ethanol free pump. There may be, but I haven't seen it. There are several places to buy non ethanol gas though. Most of those I am aware of are selling to racers, whether cars, boats, go karts or motorcycles.
I keep a printed copy of that website in my truck so I can find non ethanol gas when out of my area, mostly Louisiana when I am fishing. My boat holds 48 gallons and some of that has been in it a loooong time. I switched from Stabil to Startron and now to Chevron Marine stabilizer. So far, so good.
The BUC-EES convenience stores that are not in the zone usually have non ethanol. I've heard the one in Katy does, I believe it is in Waller County. Maybe down in Angleton as well. I'm going to take a stab at guessing what counties you can't buy in...Harris, Liberty, Chambers, Montgomery, and probably Galveston, Fort Bend, and maybe Brazoria.
I have taken several 5 gallon cans to Lake Charles LA when I was going there for other business, and brought back gas.