Descriptive display bins
Below 100 µS/cm100–500 µS/cmAbove 500–2,000 µS/cmAbove 2,000 µS/cm
These colors only separate values for viewing. They are not salinity, drinking-water, ecological, agricultural, corrosivity, impairment, or regulatory thresholds.
How to read this
Fact: each marker is a recent USGS stream-site specific-conductance measurement. The popup preserves its time-series ID, measurement time, reported unit, and approval status. Limit: conductance reflects water’s ability to carry electrical current and can vary with dissolved ions, temperature correction, flow, runoff, groundwater inputs, sensor condition, and local geology. One point does not represent an entire water body. The map infers no constituent concentration, cause, trend, salinity class, contamination, ecosystem health, drinking-water safety, agricultural suitability, or compliance.
Source contract
USGS modern Water Data OGC API, latest-continuous, parameter 00095. Requests are anonymous, keyless, limited to stream sites in the visible bounding box and preceding 48 hours, capped at 500 features, and protected by a 60-second client cooldown. Missing, nonnumeric, negative, nonpoint, or older records are excluded. No credential, proxy, saved measurement snapshot, or proprietary GIS service is used. Source/license notes · USGS API documentation
