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Algae.
You’ll have to better explain what kind of system you plan in order for me to explain the problems you may have, and how to prevent them.
From what i can gather from what you said so far, is you plan on storing wather in large plastic tanks which are made for septic systems.
If you keep them above ground, the sun will promote algae growth very fast. To prevent that, and to keep the water cool, it’s best to bury them. You’ll still be able to get into them from the access tube.
Next, because you plan on collecting run off water, it will have a lot of silt and iron, which will oxidize rapidly and coat the tanks with a thick rust colored sludge, and cause all the other problems with any indoor plumbing you might have that water with a lot of iron in it does.