The mayor of Toledo, Ohio on Monday morning  announced that in conjuncture with the state EPA he was lifting the emergency “do not drink” order that had left nearly half a million city and nearby residents without water over the weekend following the detection of dangerous levels of microcystin, a toxin created by algae blooms that likely stem farm fertilizers used in the region.

“Our water is safe,” said Mayor D. Michael Collins at a morning news conference outside the Lucas County Emergency Services Building, calling it a “good day” for area residents.

However, experts note that the algae bloom—which is being fed by the phosphorous-laden agriculture runoff from the region’s farms—will continue to be fed and that the hot, dry weather of late summer is likely to exacerbate the conditions in which the microcystin flourishes.

Microcystin can specifically target the liver of those who ingest it and is particularly harmful—and possibly deadly—for older people, those with pre-existing liver damage or immunity problems, and young children. The toxin is also deadly for animal life and the areas overall ecosystem.

In a letter (pdf) sent to the mayor’s office approving the lifting of the ban earlier in the day, director of the Ohio EPA Craig Butlter said, “Laboratory analyses of samples collected at the Collins Park Water Treatment Plant and throughout the distribution system indicate that contaminants have been consistently below the drinking water advisory threshold.”

Writing for the Toledo Blade, local journalist Tom Henry was among those who toured Lake Erie on Sunday as he took in a firsthand look at the “pea soup color” of the algae bloom that was the source of the crisis: