Know Your Environment. Protect Your Health.

Chlorate

Shippensburg Boro Water Authority

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201443.8 ppb83ND - 160.0 ppb
201555.1 ppb106ND - 150.0 ppb
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
2014-12-1600107 12201440.0 ppb
2014-12-1600106 122014ND
2014-12-1600105 122014150.0 ppb
2014-12-1690011 122014160.0 ppb
2014-12-1699001 122014 7210043ND
2014-12-1600001 122014ND
2014-12-1699001 122014 7210043-UCMR3 007ND
2014-12-1600104 122014ND
2015-06-1600105 0615130.0 ppb
2015-06-1600001 061524.0 ppb
2015-06-1600104 0615ND
2015-06-1699001 0615130.0 ppb
2015-06-1699001 0615150.0 ppb
2015-06-1699001_061556.0 ppb
2015-06-1600106 0615ND
2015-06-1600107 061561.0 ppb
2015-09-1700104 0915ND
2015-09-1700001 0915ND