I checked my records and came up with a few season four ratings. Way back when after Sci-Fi unexpectedly purged a large number of old posts from 1998, I went through the remaining archives and printed hard copies of everything that I felt was newsworthy (news about magazine articles, actor appearances in other shows, etc). Unfortunately, all that was available was from December 20, 1998 forward; so all I have in hard copy ratings data is the back half of season four (with two missing for some reason).
1-11-99 - Net Worth - 1.3
1-18-99 - Slide By Wire - No Record
3-19-99 - Data World - 1.2
3-26-99 - Way Out West - 1.2
4-02-99 - My Brother's Keeper - No Record
4-09-99 - The Chasm - 1.2
4-16-99 - Roads Taken - 1.1
4-23-99 - Revelations - 1.1
The reason for the two with no record could be because Sci-Fi Wire didn't post the records that week; they weren't the most reliable.
Also, purely from memory, I know that Alternateville Horror had a 2.0. It stuck in my mind because of how close the show got back to the Sci-Fi ratings record even at episode 8.