So, if there are no solutions, how is it that we get clean water even when the nearby water body in contaminated?

As no other solution is available, authorities must deal with the catastrophic repercussions of the harmful blooms by purifying toxin-contaminated water in water-treatment facilities using advanced filtration processes or through massive chlorination, and subsequent de-chlorination, at the water intake points. Such treatments are expensive, not always effective (a notable example is the State of Emergency declared in Ohio in August 2014, when processed tap water drawn from Lake Erie was rendered unusable due to a cyanobacterial toxin contamination), and only solve the drinking-water problem, leaving damages to the environment and to the industry unattended.