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 Although the information provided here was accurate and current when first created, it is now outdated.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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Composite Statistic
Code Name Performance Type Ind Print Format
A Average N AVE
H Maximum N MAX
L Minimum N MIN
N Number of Observations for the Sample N NUM
S Standard Deviation N SD
U Sum of Squares N SS
V Variance N VAR
C Coefficient of Error N COF
X Coefficient of Variance N COV
E Skewness Y SKW
F Kurtosis Y KUR
Z Number of Samples in Composite Exceeds Established Limit N EXC
% Precision Y PRE
$ Accuracy Y ACC
B None of the Above N
D Indicates Replicate Sample N REP