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EWG's Tap Water Database — 2021 UPDATE

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Chlorate

Bertie County Regional Water

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND300ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-03-112990325ND
2014-03-112990341ND
2014-03-112990308ND
2014-03-112990282ND
2014-03-172993516ND
2014-03-172993715ND
2014-03-172993462ND
2014-03-182993785ND
2014-03-182993841ND
2014-03-182993440ND
2014-03-182993836ND
2014-03-192994695ND
2014-03-192994867ND
2014-03-192994703ND
2014-03-192994641ND
2014-09-173106730ND
2014-09-173106403ND
2014-09-173106681ND
2014-09-173106738ND
2014-09-173106413ND
2014-09-173106689ND
2014-09-183107747ND
2014-09-183107512ND
2014-09-183107790ND
2014-09-183107505ND
2014-09-183107911ND
2014-09-183107540ND
2014-09-183107550ND
2014-09-183107489ND
2014-09-183107531ND