Washington D.C. — Real-time condition assessment
Sources: 2024 incident — Audubon Society (80 Mallards died from avian trematode; pool drained and cleaned). 2026 incidents — TMZ (1 confirmed dead duck June 21), Raw Story / Daily Beast ("dozens" of deaths reported following hydrogen peroxide treatments); exact daily counts not publicly disclosed by NPS. 2026 bars show reported/estimated minimums.