August 4, 2025 (Moscow, Idaho) — The City of Moscow has temporarily closed Hordemann Pond at Kiwanis Park due to unsafe water conditions. Recent water testing confirmed the presence of cyanobacteria—commonly known as blue-green algae—which can produce toxins harmful to both humans and animals. As a precaution, all recreational activities at the pond, including fishing, are suspended until further notice. 
Blue-green algae visible at Hordemann Pond Blue-green algae visible at Hordemann Pond
Health and Safety Notice Children and pets are especially vulnerable to the effects of cyanobacteria. People can be exposed to the toxins in several ways: Ingesting contaminated water, whether accidentally or intentionally. Skin contact with affected water during activities like wading or swimming. Inhaling water spray or mist that contains the bacteria or its toxins. Symptoms of exposure in humans may include abdominal pain, sore throat, headache, vomiting, nausea, dry cough, diarrhea, blistering around the mouth, and in severe cases, pneumonia. What to Look For The algae bloom is visible in the pond’s unusually green water and in thick mats of algae along the shoreline. Blue-green algae are naturally occurring bacteria found in many Idaho water bodies. While not all species produce toxins, harmful algal blooms can develop when conditions are just right—typically during the warm late summer months when water temperatures are high, phosphorus levels are elevated, and nitrogen is limited. The City will continue monitoring water quality and will reopen the pond once it is deemed safe. Public safety remains our top priority. For more information, please contact David Schott, Parks and Facilities Manager, via email or by phone at (208) 883-7098. ### Story Contact: David Schott, Parks and Facilities Manager
Phone: (208) 883-7098
Email: David Schott