The first thing I notice is that a lot of your sentences are long to the point where they unwieldy. Stuff like
He sat in his favourite place, an old worn chair made from maple wood that faced the beach with his eyes closed not asleep, but rather listening to the Ocean letting the wind rock him back and forth with every wave slapping the rocks below
Could be cut down to read better. It feels like you're trying to go for a Cormac McCarthy style, especially with the lack of dialogue tags, but it often feels like it gets tripped up.
A salty breeze blew past the old man on his way into the house,
This should be in present tense.
When the man returns he is holding a mystical looking c
"mystical looking" is a weak description. Don't just tell us that it's mystical looking, tell us what about it makes it feel mystical.
Apparently, the township's water plant was having a problem pumping water
This is awkward phrasing. You can just say "was malfunctioning".
After turning the lights off and shutting the door to the office, the man hears a noise come from the only other room he hasn't entered so far, and goes to check it out believing it to be part of the problem he came to fix.
Should be past tense.
and flicked a switch on the wall to his right, turning on the lights.
You could just say "and turned on the lights".
Startled by the rapidly unfolding events around him
You can just say he was startled, it's obvious to the reader what he was startled by.
and in the corner of the room spots an impossible site
sight
What the man saw that perplexed him so much so, into dropping his flashlight with just a glance was a singular mass of water sitting in a physically impossible way.
This sentence feels like it has some words muddled. Also again, you want a better description than just saying something is "physically impossible". You describe it afterwards, so just use the description to show what you want instead of telling the reader beforehand.
it's assumed breathing slowing down which the man thought may mean that it is trusting him a bit, which had put a grin on his face.
its. Check the rest of the story for it's/its errors. it's is a contraction of it is, its is the possessive pronoun.
he ignores the strange sensation
ignored
While I like the story being told here, the writing is a big weakness. I'd suggest rereading it, sentence by sentence, and asking yourself "what is this communicating? Does it read awkwardly? What can be cut? What needs to be described better? What descriptions are unnecessary or redundant?" I'd suggest also finding some professional writing to compare it to, so you can a good feel for how professional writers structure their sentences. Once the writing has been tuned up, I could see this being successful on the site, but right now I don't think it's ready for posting.