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EWG's Tap Water Database — 2019 UPDATE

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Chlorate

Hollidaysburg Municipal Authority

NOTE: Hollidaysburg Municipal Authority purchases water from Altoona Water Authority which is required to test for chlorate. Sample information shown below was taken by Altoona 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.

 

42

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
201314.2 ppb104ND - 38.0 ppb
20144.38 ppb324ND - 49.0 ppb
2015N/A00N/A
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: Hollidaysburg Municipal Authority purchases water from Altoona Water Authority which is required to test for chlorate. Sample information shown below was taken by Altoona Water Authority.

Date Lab ID Result
2013-11-18201311190095AM36.0 ppb
2013-11-18201311190109AM32.0 ppb
2013-11-18201311190119AM38.0 ppb
2013-11-18201311190134AM36.0 ppb
2013-11-19201311200331AMND
2013-11-19201311200627AMND
2013-11-19201311200339AMND
2013-11-19201311200367AMND
2013-11-19201311200425AMND
2013-11-19201311200384AMND
2014-02-25201402260726AMND
2014-02-25201402260842AMND
2014-02-25201402260697AMND
2014-02-25201402260732AMND
2014-02-25201402260624AMND
2014-02-25201402260667AMND
2014-02-26201402270296AMND
2014-02-26201402270177AM20.0 ppb
2014-02-26201402270315AMND
2014-02-26201402270369AM49.0 ppb
2014-02-26201402270305AM22.0 ppb
2014-02-26201402270331AM49.0 ppb
2014-05-27201405280255AMND
2014-05-27201405280308AMND
2014-05-27201405280302AMND
2014-05-27201405280262AMND
2014-05-28201405290423AMND
2014-05-28201405290394AMND
2014-05-28201405290639AMND
2014-05-28201405290427AMND
2014-05-28201405290390AMND
2014-05-28201405290463AMND
2014-08-20201408210520AMND
2014-08-20201408210522AMND
2014-08-20201408210518AMND
2014-08-21201408220555AMND
2014-08-21201408220523AMND
2014-08-21201408220521AMND
2014-08-21201408220452AMND
2014-08-21201408220529AMND
2014-08-21201408220519AMND
2014-09-29201409300395AMND