# Cyanobacteria alerts in Buenos Aires province > Live situation record from CLSTR: https://clstr.news/situations/cyanobacteria-alerts-in-buenos-aires-province > Updated: 2026-08-19T11:43:33.000Z. Sources: 11. Developments: 2. Authorities in the province of Buenos Aires have issued orange alerts for several municipalities due to the presence of cyanobacteria. Initially, the alert covered 17 municipalities, including Alberti, Chacabuco, General Pinto, Junín, and Trenque Lauquen, prompting the use of sanitary flags and warnings for the public to avoid entering the water. The situation expanded to include areas such as Monte Hermoso, where precautions were issued for the Sauce Grande Lagoon, advising against the consumption of local water or fish. In Bahía Blanca, management efforts at the Paso de las Piedras reservoir have shown positive results. A collaboration between the National University of the South and CONICET implemented a system of nine buoys that use energy stimuli to create an environment less favorable for cyanobacteria development, aiming to prevent water service interruptions. ## Timeline ### 2026-08-19: Buenos Aires province issues cyanobacteria alerts in several municipalities Buenos Aires province has issued orange alerts for cyanobacteria in several areas, including Monte Hermoso, while Bahía Blanca utilizes new energy-emitting buoys to successfully manage reservoir water quality. 3 sources. https://clstr.news/cluster/buenos-aires-province-issues-cyanobacteria-alerts-in-several-municipalities ### 2026-08-16: Cyanobacteria alert issued for 17 Buenos Aires municipalities An orange alert for cyanobacteria has been issued in 17 Buenos Aires municipalities, including Alberti and Junín, advising citizens to avoid contact with water due to medium health risks. 8 sources. https://clstr.news/cluster/cyanobacteria-alert-issued-for-17-buenos-aires-municipalities --- Cite as: Cyanobacteria alerts in Buenos Aires province. CLSTR, https://clstr.news/situations/cyanobacteria-alerts-in-buenos-aires-province