On this page: About the National Data | Methodology | History
About the National Data
Data
Baseline: 10.4 micrograms per gram (µg/g) was the concentration level of perchlorate (creatinine corrected) in urine samples at which 95 percent of the population aged 3 years and over was at or below in 2015-16
Target: 8.4 µg/g
Methodology
Methodology notes
Urinary perchlorate levels reflect recent exposure.
Reference: CDC Biomonitoring Summary for Perchlorate
History
In 2021 the baseline value was revised from 10.7 ug/g to 10.4 ug/g because of a change in the baseline years and the age range of the population included in the measurement. The same target-setting method was used but the prediction interval (PI) used to set the target was updated from the 25% PI to the 33% PI. The baseline and numerator text was also revised to reflect that these measurements include individuals 3 years of age and older.