It was stressed that commercial cider be sent for analysis, but I don’t recall TTB actually saying that. There is a TTB label approval requirement as well which includes sulfites, abv etc. luckily WA state has many established cideries so the process is well worn by others before you.
On the juice track, does WA allow unpasteurized juice to be sold? If not you will feel the real weight of local and federal regulations protecting the consumer from your juice and the cost associated with pasteurization, testing, inspection, on and on to prevent your potentially deadly product from the untold carnage it will do. We are in a state that allows us to apply the federal label saying it’s unpasteurized and can harm the very old, the very young and the immune compromised.