Experts Warn of Resistant Bacteria and Health Risks in Israeli Streams After Storms

Swimming in natural bodies of water like streams and springs has become increasingly popular in Israel during the summer. However, environmental and health experts caution that heavy rains, sewage overflows, and agricultural runoff significantly increase health risks in these waters. After storms, urban streams often become unsafe for 24 to 72 hours due to contamination from sewage systems and agricultural pollutants.

Common illnesses linked to swimming in contaminated water include gastrointestinal problems, especially dangerous for children. More severe risks involve leptospirosis, a bacterial disease transmitted through the urine of rodents and livestock, which can cause organ failure and death. Past outbreaks have affected athletes competing in open water events. Additionally, warm or stagnant waters may develop toxic blue-green algae blooms that irritate skin and eyes and can rarely harm the liver or nervous system.

Research also indicates that frequent swimmers may carry antibiotic-resistant E. coli bacteria originating from wastewater treatment plants, complicating future infection treatments. Official water quality tests, which rely on fecal bacteria indicators like E. coli and enterococci, take days to process and cannot provide immediate safety assessments for swimmers.

Experts therefore advise caution: avoid swimming before or after heavy rains, watch for suspicious signs such as murky green water or foam, avoid swallowing water, shower immediately after swimming, and cover any open wounds. These precautions aim to reduce exposure to hidden infections and resistant bacteria in natural waters.