One time I was at a LFS downtown and one of the guys there and I started talking. I mentioned I was battling a hair algae outbreak and his response was, 'yep, its about that time of year.'
To my surprise, I didn't think algae blooms were tied to the time of year. He then explained that our water system comes from reservoirs. And it is through these reservoirs where algae spores originate and can infect our tanks. The way he explained it seemed to make sense, but then I imagine our water to go through some process that would clean all this kind of stuff before we drink it.
Sorry a bit off topic, but relating to algal blooms, anyone ever heard of this possibility?
The number of filtration systems our tap water goes through nowadays (post-2010 Olympics) makes me think this is less likely now than it was say 10 years ago. I still never do major water changes during or right after a huge storm, cause the turbidity might overwhelm the filtration systems.