Here are two facts to explain why Cyclosporiasis is a problem here in the U.S. this time of year

The point is often cattle waste gets seeps down into  water tables and helps cause this problem which seems to be getting worse every summer now since around 2000 AD in the U.S.

As more people and cattle are all over the place as well as deer and other animals pooping in reservoirs and any human contamination from Septic Systems as well this becomes a more serious problem 

begin quotes:
 
Chlorine resistance: The Cyclospora oocyst outer shell is notoriously resistant to standard chlorine disinfection, making prevention upstream in fields and water sources vital. 
Seasonal spikes: Infections rise between May and August because the parasite requires warm environmental temperatures to mature into its infectious form. 
end partial quote from AI.


So, as a result even though waterborn infections rise between May and August, depending upon the area and climate of municipal Water systems and temperatures they can persist some places until September and other places until November or later. The places that it would stay later would be places like Florida and California and maybe Texas and places warmer later into the year toward Christmas.
As a direct result boiling water before you drink it might be recommended for everyone using tap water to drink from municipal Water systems nationwide.
However, if you get a reverse osmosis water tippet for your kitchen the protozoa are screened out by this filtration system completely so you don't have to boil your water if you have reverse osmosis tippet in your kitchen to get drinking water from.