Water quality is a system
Temperature, dissolved oxygen, pH, nutrients, conductivity, suspended solids, and bacteria describe different parts of the same river system. A useful assessment looks at them together rather than treating one reading as a complete verdict.
Why measurements change
Rainfall, season, sunlight, flow, land use, wastewater, road salt, and biological activity can all change a measurement. That is why dates, stations, units, and recent history matter.
How Rivistry presents data
Rivistry connects public measurements to their source, station, date, and unit, then adds cautious explanations and weekly comparisons. Rivistry is an educational resource, not an official safety determination.