The ameba can be found in: Bodies of warm freshwater, such as lakes and rivers Geothermal (naturally hot) water, such as hot springs Warm water discharge from industrial plants Geothermal (naturally hot) drinking water sources Swimming pools that are poorly maintained, minimally-chlorinated, and/or un-chlorinated Water heaters. Naegleria fowleri grows best at higher temperatures up to 115°F (46°C) and can survive for short periods at higher temperatures. Soil