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Algal Bloom Conditions Ease at Samnak and Hwamyeong Water Sports Town Sites… Algae Alert Lowered to “Caution”

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Busan Metropolitan City, led by Mayor Chun Jae-soo, announced that it will lower the algae alert for the Samnak and Hwamyeong Water Sports Town sites in the recreational sections of the Nakdong River from “Warning” to “Caution” today, September 10.

The downgrade comes 15 days after the City issued the “Warning” level on August 26.

Based on harmful cyanobacteria cell counts measured on August 31 and September 8, the City will lower the algae alert to “Caution” and ease restrictions on recreational water activities from “prohibited” to “advised against.”

At the Samnak Water Sports Town site, the harmful cyanobacteria cell counts were 44,313 and 10,005 cells per milliliter, respectively. At the Hwamyeong Water Sports Town site, the corresponding counts were 49,182 and 10,948 cells per milliliter.

The City believes that recent rainfall and lower temperatures have contributed to the decline in harmful cyanobacteria cell counts.

For recreational water sections, a “Caution” algae alert is issued when harmful cyanobacteria cell counts exceed 20,000 cells per milliliter in two consecutive measurements. A “Warning” alert is issued when the counts exceed 100,000 cells per milliliter in two consecutive measurements or exceed 500,000 cells per milliliter in a single measurement.

Until the algae alert is lifted, the City plans to continue public information and guidance efforts through measures including banners, public announcements, and on-site patrols.

Sim Jae-min, Assistant Mayor of Environmental and Water Policy Office, said, “With recent rainfall and falling temperatures, algal bloom conditions are expected to improve significantly. However, as the ‘Caution’ algae alert remains in effect, we ask residents to refrain from water leisure activities at Samnak and Hwamyeong Ecological Parks and from catching or consuming fish and shellfish until the alert is lifted.”