Know Your Environment. Protect Your Health.

Chlorate

Lakehaven Utility District

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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND150ND
201428.4 ppb238ND - 120.0 ppb
2015N/A00N/A
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
2013-08-06201308070393AMND
2013-08-06201308070391AMND
2013-08-06201308070507AMND
2013-08-06201308070389AMND
2013-08-06201308070497AMND
2013-08-06201308070395AMND
2013-08-12201308130185AMND
2013-08-12201308130166AMND
2013-08-12201308130146AMND
2013-08-12201308130061AMND
2013-08-20201308210574AMND
2013-08-20201308210465AMND
2013-08-20201308210412AMND
2013-08-26201308280245AMND
2013-08-27201308280248AMND
2014-01-13201401140251AMND
2014-01-13201401140203AMND
2014-01-13201401140201AMND
2014-01-21201401220155AM38.0 ppb
2014-01-21201401220100AM61.0 ppb
2014-01-22201401230194AMND
2014-01-22201401230158AMND
2014-01-22201401230160AMND
2014-01-22201401230192AMND
2014-04-16201404170317AMND
2014-04-22201404230374AM74.0 ppb
2014-04-22201404230355AM77.0 ppb
2014-05-13201405140667AMND
2014-06-03201406040625AMND
2014-07-01201407020552AMND
2014-07-08201407090806AMND
2014-07-09201407100475AM82.0 ppb
2014-07-09201407100403AM92.0 ppb
2014-07-22201407230564AMND
2014-07-22201407230705AMND
2014-07-22201407230568AMND
2014-09-30201410010210AM110.0 ppb
2014-09-30201410010172AM120.0 ppb