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EWG's Tap Water Database — 2019 UPDATE

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Chlorate

Marine Corps Base Hawaii

NOTE: Marine Corps Base Hawaii purchases water from Honolulu-Windward-Pearl Harbor which is required to test for chlorate. Sample information shown below was taken by Honolulu-Windward-Pearl Harbor.

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.

 

109

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
201329.0 ppb10771ND - 160.0 ppb
2014ND20ND
2015ND20ND
2016N/A00N/A
2017N/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

NOTE: Marine Corps Base Hawaii purchases water from Honolulu-Windward-Pearl Harbor which is required to test for chlorate. Sample information shown below was taken by Honolulu-Windward-Pearl Harbor.

Date Lab ID Result
2013-04-01201304030421AMND
2013-04-01201304030419AM26.0 ppb
2013-04-01201304030417AM30.0 ppb
2013-04-01201304030423AMND
2013-04-02201304040561AM30.0 ppb
2013-04-02201304040555AM21.0 ppb
2013-04-02201304040551AM30.0 ppb
2013-04-02201304040557AMND
2013-04-02201304040553AM50.0 ppb
2013-04-02201304040559AM47.0 ppb
2013-04-02201304040549AM27.0 ppb
2013-04-03201304050212AM28.0 ppb
2013-04-03201304050216AM28.0 ppb
2013-04-03201304050214AMND
2013-04-03201304050206AMND
2013-04-03201304050210AM24.0 ppb
2013-04-03201304050208AM35.0 ppb
2013-04-05201304090174AMND
2013-04-05201304090178AM42.0 ppb
2013-04-05201304090180AM51.0 ppb
2013-04-05201304090182AMND
2013-04-05201304090176AM34.0 ppb
2013-04-08201304100359AM27.0 ppb
2013-04-08201304100367AMND
2013-04-08201304100361AMND
2013-04-08201304100365AMND
2013-04-08201304100363AMND
2013-04-08201304100357AM29.0 ppb
2013-04-09201304110566AM52.0 ppb
2013-04-09201304110570AM160.0 ppb
2013-04-09201304110572AM67.0 ppb
2013-04-09201304110568AMND
2013-04-10201304120417AMND
2013-04-10201304120419AMND
2013-04-10201304120421AM30.0 ppb
2013-04-12201304160082AM35.0 ppb
2013-04-12201304160086AM29.0 ppb
2013-04-12201304160070AMND
2013-04-15201304170635AMND
2013-04-15201304170633AM23.0 ppb
2013-04-16201304180489AMND
2013-04-16201304180487AMND
2013-04-17201304190454AM22.0 ppb
2013-04-17201304190456AM23.0 ppb
2013-04-19201304230198AM110.0 ppb
2013-04-19201304230200AMND
2013-04-22201304240299AM36.0 ppb
2013-04-22201304240301AM28.0 ppb
2013-04-23201304250519AMND
2013-04-24201304260160AM83.0 ppb
2013-04-24201304260158AM42.0 ppb
2013-04-26201304300275AM42.0 ppb
2013-04-26201304300183AM22.0 ppb
2013-10-01201310030508AM24.0 ppb
2013-10-01201310030504AM150.0 ppb
2013-10-01201310030506AM33.0 ppb
2013-10-01201310030502AM34.0 ppb
2013-10-02201310040387AMND
2013-10-02201310040383AM23.0 ppb
2013-10-02201310040385AM24.0 ppb
2013-10-04201310080411AMND
2013-10-04201310080415AM49.0 ppb
2013-10-04201310080413AMND
2013-10-04201310080419AMND
2013-10-04201310080417AM27.0 ppb
2013-10-04201310080421AM72.0 ppb
2013-10-07201310090449AM37.0 ppb
2013-10-07201310090445AM32.0 ppb
2013-10-07201310090447AM81.0 ppb
2013-10-08201310100584AM30.0 ppb
2013-10-08201310100582AM32.0 ppb
2013-10-08201310100578AM56.0 ppb
2013-10-08201310100580AM55.0 ppb
2013-10-09201310110394AM46.0 ppb
2013-10-09201310110396AM46.0 ppb
2013-10-11201310150231AM65.0 ppb
2013-10-11201310150225AM30.0 ppb
2013-10-11201310150229AMND
2013-10-11201310150233AM43.0 ppb
2013-10-11201310150227AM38.0 ppb
2013-10-14201310160251AM38.0 ppb
2013-10-14201310160255AMND
2013-10-14201310160257AM22.0 ppb
2013-10-14201310160253AM40.0 ppb
2013-10-15201310170263AMND
2013-10-16201310180369AMND
2013-10-16201310180365AM38.0 ppb
2013-10-16201310180363AM50.0 ppb
2013-10-16201310180367AM51.0 ppb
2013-10-16201310180456AM33.0 ppb
2013-10-16201310180458AM56.0 ppb
2013-10-16201310180371AMND
2013-10-16201310180361AM44.0 ppb
2013-10-18201310220217AM20.0 ppb
2013-10-18201310220215AMND
2013-10-18201310220219AM29.0 ppb
2013-10-18201310220228AM38.0 ppb
2013-10-21201310230542AMND
2013-10-21201310230540AMND
2013-10-21201310230538AM22.0 ppb
2013-10-21201310230577AMND
2013-10-21201310230575AM100.0 ppb
2013-10-22201310240443AMND
2013-10-22201310240445AMND
2013-10-23201310250245AM84.0 ppb
2013-10-23201310250247AM47.0 ppb
2013-10-23201310250249AMND
2014-04-09201404120300AM41.0 ppb
2014-07-15201407170569AM30.0 ppb