Fear of Being Sucked Down a Toilet -- "The louder they flush, the worse it is."

Fear of Drains -- Such as those at the bottom of a pool or spa.  11 submissions for this one so far.

Fear of Hair of Pasta in the Plug Hole (Drain)

Fear of Not Having Access to a Toilet -- Now this one makes sense to me.  :)

Fear of Public Restrooms -- Not mere disgust, but fear.  Probably related to either Aerophobia or Bacteriophobia.

Fear of Toilets -- Submitter includes, though to a lesser extent, plumbing fixtures, pipe-work in basements, drain holes, & sewage drains.

Fear of Toilet Cisterns -- "If the lid is ajar, I get a bit twitchy.  If the lid is off -- forget it -- I can't go in the room."  Submitter has been known to take spouse in the bathroom to help comfort/protect her if a suspicious-looking cistern was present.  She suggested "Crapperophobia."

Fear of Toilets Flushing

Fear of Toilet Paper

Fear of the Toilet Overflowing -- and drowning in the process...  *YUCK!*

Fear of Wall-Hung Toilets

Fear of Walking over Drains