Information provided for informational purposes only

Note: This information is provided for reference purposes only. Although the information provided here was accurate and current when first created, it is now outdated.


This web site provides query access to over 200 million monitoring records originally reported to EPA via the Legacy STORET System.


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Reporting Units
Code Name
A mg/l
B ug/l
C mg/kg (ug/g)
D ug/kg
E #/100 ml (no./100 ml) (cells/100 ml)
F #/ml (no./ml) (cells/ml)
G #/liter (cell/liter)
H degrees C
I distance
J degrees F
L gpm, gpd, or mgd
M pc/l
O %, percent
P no units, code, ratio, etc.
Q time: day, mo, yr, sec, min, hr
R mmHg
S pH
T pc/gm
U no/sq ft
V #/day (lb/day), lb/yr
W #/effort
X production: ton, ton/day Kg/1000gal
Y wt. measurement
Z "catch all"