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Start at http://waterdata.usgs.gov/
(this link opens in a new window).
Step 1
 Click
on the blue Water quality button.
Step 2
Choose
your state or territory under Geographic Area (in the upper right-hand
corner of the page).
Step 3
Click
Samples.
Step 4
Select
Hydrologic Unit in the first column and Site type in the
third column. Submit.
Step 5
Select
your Hydrologic Unit Code (HUC). What is
a HUC? Select Surface Water under Site type. Then scroll down
to Retrieve Water quality samples for Selected Sites and select
Inventory of Water-Quality data. Click Submit.
Step 6
You
may need to scroll down the page to locate all the stations with water-quality
data in your watershed. For each station, click on Inventory of water-quality
data with retrieval under Output Formats. You will get a table
like the one below that shows what kind of water-quality data are available
from this station, how many samples were collected, and when.
Step 7
Select
the box(es) next to the data you want.
Step 8
Scroll
down the page, enter a range of dates to restrict the amount of data [optional],
and click Submit.
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