EWG's Tap Water Database — 2019 UPDATE



Juliaetta, City of

Picloram is a herbicide that in studies of laboratory animals has been linked with reduced testicular size and damage to the liver and thyroid.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20130.190 ppb32ND - 0.303 ppb
20140.317 ppb330.228 ppb - 0.383 ppb
20150.475 ppb110.475 ppb
20160.675 ppb21ND - 1.35 ppb
20174.98 ppb114.98 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 166 ppb

The EWG Health Guideline of 166 ppb for picloram was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against change to internal organs.

EPA Maximum Contaminant
Level (MCL) 500 ppb

The legal limit for picloram, established in 1992, was based on toxicity studies in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

Date Lab ID Result
2013-09-24S130925002-0010.268 ppb
2013-10-10S131010022-0010.303 ppb
2014-03-05S140305020-0010.341 ppb
2014-06-25S140625021-0010.383 ppb
2014-08-07S140807038-0010.228 ppb
2015-04-09S150409035-0010.475 ppb
2016-05-25S160525039-0011.35 ppb
2017-11-29S171129037-0014.98 ppb