Unless you drive through deep water so that the filter is actually in water or have a duct for air pointing straight at it then I'm 100% sure it will be fine I check mine often as I like to know it's alright and it's fine everytime. In my opinion the ones that sit behind the grill at the top will get as much if not more water into the induction system as this is where water vapour gets to first whilst driving. Most oem set ups are actually taken from the wheel arch liner where the one I have sits.