Thank you for your bug report.
I tested to make sure that this mod destroys water pumps or not with Factorio 0.17.69.
My test situation was below:
- I started with a small map.
- I put some water pumps.
- I just waited until the tiles are eroded.
As a result, I could not reproduce the issue.
As expected, some facilities that were on the tiles eroded by water has be destroyed.
On the other hand, the water pump which were on the next to the tiles were not destroyed.
So, I think that this mod would not be related to your issue.
But, if there are something difficulties by combinations with other mods, I need more informations to investigate it. :)