All sexually mature female reptiles kept something remotely close to properly, produce infertile eggs. The eggs become fertilized when mating with a male monitor that is producing sperm (somewhere close to suitable conditions).
Does the lizard have proper substrate? If not it is very very stressful to lay on the surface, or in water, in fact enough so much that it can cause serious health problems.
There was one case known of a komodo female that was 8 years old, never exposed (supposedly) to a male, but another female, it layed good eggs that hatched. It happens with many reptiles, but eggs layed in water would have been drowned in seconds even if they were good.
Good eggs are almost pure white, fat, much more rounded. Infertiles are more off white, or yellowish, are long, and more tubluar shaped.

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• nile monitor 2 eggs - coachise2003, Sat Nov 17 18:36:49 2007
• yep - sungazer, Sat Nov 17 19:02:59 2007
• You mean fertile eggs? - SHvar, Sun Nov 18 20:48:45 2007