What is lurking in your water?

Did you know concentrations of water quality parameters (e.g. nutrients and salts), are compared to guidelines to assess if water quality is acceptable for uses, such as irrigation, domestic consumption, or watering livestock? It's important to know that just because all of the water quality parameters measured may be acceptable (e.g. salinity is low, arsenic is below detection levels) that doesn't mean there isn't something potentially toxic in the water. Chemicals like pesticides or PFAS may be present but just haven't been analysed.