Notice:Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions. Websites displaying real-time data, such as Earthquake, Volcano, LANDSAT and Water information needed for public health and safety will be updated with limited support. Additionally, USGS will not be able to respond to inquiries until appropriations are enacted. For more information, please see www.doi.gov/shutdown.
The data used to produce this plot are
provisional
and have not been reviewed or edited. They may be subject to change.
Data pulled 08-08-12 14:34.
The chart is interactive: you can mouse over to highlight individual values. You can click and drag to zoom. Double-clicking will zoom you back out. Shift-drag will pan.
Notes
Water-quality criteria or standards of 250 mg/L and 1000 mg/L
for sulfate are plotted as horizontial dashed lines
(more...).
A second, smaller plot indicates the statistical probability
that the computed values have exceeded
these criteria or standards.
The statistical (regression) model used to compute
sulfate is site specific.
Gaps in data occur either when data are not
available or their values are outside of the range for the regression model.
Users should consider these factors, as well as uncertainty associated
with regression-model computed data, when applying this information
to specific issues.