YOU SAID:

when i went into the toilet the water level already has risen

INTO JAPANESE

トイレに入った時はもう水位が上がっていました

BACK INTO ENGLISH

The water level was already high when I entered the toilet

INTO JAPANESE

トイレに入った時はもう水位が高かった

BACK INTO ENGLISH

When I entered the toilet, the water level was already high.

INTO JAPANESE

トイレに入ると、もう水位が高かったです。

BACK INTO ENGLISH

When I entered the toilet, the water level was already high.