Know Your Environment. Protect Your Health.

Chlorate

Avion Water Company - Greater Avion

Chlorate forms in drinking water as a byproduct of disinfection. Chlorate impairs thyroid function, making chlorate exposure most harmful during pregnancy and childhood. Read More.

In 2002, California scientists proposed an advisory value, called an action level, for chlorate at 200 parts per billion. Between 2013 and 2015, the EPA collected data through the Unregulated Contaminant Monitoring Rule program and found that over 15 percent of water tests from 38 percent of utilities had chlorate levels above a health-protective concentration, which federal scientists defined as 210 parts per billion, nearly equivalent to the California advisory value.

Click here to read more about disinfection byproducts.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND120ND
2015ND110ND
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021N/A00N/A
2022N/A00N/A
2023N/A00N/A

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 210 ppb

The EWG Health Guideline of 210 ppb for chlorate was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against hormone disruption.

ppb = parts per billion

All test results

Date Lab ID Result
2014-09-17201409180722AMND
2014-09-17201409180782AMND
2014-09-17201409180696AMND
2014-09-18201409190370AMND
2014-09-18201409200130AMND
2014-09-18201409190420AMND
2014-09-18201409190416AMND
2014-09-18201409190394AMND
2014-09-18201409190397AMND
2014-09-18201409190324AMND
2014-09-22201409230153AMND
2014-09-22201409230173AMND
2015-03-12201503140142AMND
2015-03-12201503140185AMND
2015-03-18201503190382AMND
2015-03-24201503250476AMND
2015-03-24201503250484AMND
2015-03-25201503260673AMND
2015-03-25201503260746AMND
2015-05-20201505040214AMND
2015-05-20201505040212AMND
2015-07-30201507160161AMND
2015-07-30201507160160AMND