Public Health Health Risks Bacterial Contamination Fecal Contamination E. coli Nitrate Pollution Fecal Pollution Microbiological Levels Bacteria Chemical Pollutants Nitrates Microbiological Safety Public Health Risks Chemical Contaminants Freshwater Sources Beach Safety Cryptosporidium Wastewater Selenium Cyanobacteria Recreational Safety PFAS Sewage Management Beach Monitoring Aguas Residuales Filtration Solutions Coliform Bacteria Wastewater Management Cuyahoga River Testing Procedures PFAS Chemicals Investigation Dieldrin Flooding Oil Spills Sources of Contamination Pharmaceutical Pollution Water Supply Arsenic Arsenic Pollution Sewage Pollution Lead Contamination Sanitation Sewage Treatment Infrastructure Issues Parasites Pesticides Sewage Microbiological Contaminants Sanitation Issues Public Health Issues Chemical Pollution Public Utilities Hazardous Materials Wildfires Bottled Water Industry Yamuna River Health Impacts Ammonia Levels Microbiological Analysis Health Hazards Regulations
Isotope readings from limescale reveal a shift from wells to a high‑flow aqueduct that changed bathing hygiene with occasional heavy‑metal spikes.
