No need for vacationers to test the waters here, experts say.

The summer vacation spoiler has been identified as a cyanobacterial bloom — and the National Centers for Coastal Ocean Science (NCCOS) says that the crummy blue-green conditions seem to be spreading, with a noticeable increase in scale since Aug. 2.

Currently, the contamination stretches approximately 160 miles and impacts coastal communities, ranging from Monroe, Michigan, to Port Clinton, Ohio.

The Buckeye State’s beloved Sandusky Bay is an especially adversely affected area and has comparatively strong concentrations of cyanobacteria — and cyanotoxins, a byproduct of the microorganisms — in the lake water.

The Ohio Department of Health has advised residents and visitors along the western shore of Lake Erie to keep out

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