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EWG's Tap Water Database — 2019 UPDATE

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Perchlorate

Valencia Heights Water Company

Perchlorate, a component of rocket fuel, occurs both naturally and as a synthetic chemical. Ingested perchlorate interferes with thyroid function. Exposure to perchlorate during pregnancy and childhood can impair cognitive development. Read More.

According to the EPA, perchlorate likely contaminates the water of more than 16 million Americans. Perchlorate interferes with iodine uptake in the thyroid, which can result in reduced thyroid hormones and an impact on metabolism, physical development and cognitive development. Children and developing fetuses are the most at risk from perchlorate contamination.

Perchlorate is the only unregulated contaminant for which the EPA has attempted to set a federal drinking water standard since 1996. However, the agency has yet to propose a draft limit for this contaminant. Perchlorate in drinking water is regulated in Arizona, California, Massachusetts, New Jersey, New York and Texas. California set a public health goal of 1 part per billion for perchlorate in 2015.

Click here to read more about perchlorate.

 

522

Samples

0

Samples exceeding legal limit (MCL)

108

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.04 ppb9820ND - 7.10 ppb
20131.22 ppb8921ND - 6.40 ppb
20140.710 ppb8811ND - 7.70 ppb
20151.34 ppb8621ND - 7.50 ppb
20161.34 ppb8218ND - 8.20 ppb
20171.35 ppb7917ND - 7.90 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 1 ppb

The EWG Health Guideline of 1 ppb for perchlorate was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against hormone disruption.

ppb = parts per billion

All test results

Date Lab ID Result
2012-01-043761-005-08154.20 ppb
2012-01-043761-006-0800ND
2012-01-043761-010-07457.10 ppb
2012-01-043761-012-0730ND
2012-01-109588-005-0805ND
2012-01-109588-010-07555.70 ppb
2012-01-113761-006-0715ND
2012-01-183761-006-0825ND
2012-01-253761-006-0730ND
2012-02-013761-005-0755ND
2012-02-013761-006-0805ND
2012-02-013761-010-07355.90 ppb
2012-02-013761-012-0720ND
2012-02-083761-006-0735ND
2012-02-153761-006-0720ND
2012-02-223761-006-0720ND
2012-02-293761-006-0730ND
2012-03-073761-005-0755ND
2012-03-073761-006-0805ND
2012-03-073761-010-07354.90 ppb
2012-03-073761-012-0715ND
2012-03-143761-006-0730ND
2012-03-213761-006-0730ND
2012-03-283761-006-0740ND
2012-04-043761-005-0855ND
2012-04-043761-006-0800ND
2012-04-043761-010-0730ND
2012-04-043761-012-0720ND
2012-04-113761-006-0730ND
2012-04-183761-006-0800ND
2012-04-209588-005-0825ND
2012-04-209588-010-0815ND
2012-04-209588-012-0805ND
2012-04-253761-006-0730ND
2012-05-023761-005-0805ND
2012-05-023761-006-0820ND
2012-05-023761-010-07455.90 ppb
2012-05-023761-012-0730ND
2012-05-093761-006-0735ND
2012-05-163761-006-0830ND
2012-05-233761-006-07304.00 ppb
2012-05-303761-006-0800ND
2012-06-063761-005-0730ND
2012-06-063761-006-0820ND
2012-06-063761-010-07506.00 ppb
2012-06-063761-012-0810ND
2012-06-133761-006-0725ND
2012-06-203761-006-0720ND
2012-06-273761-006-0720ND
2012-07-033761-005-0815ND
2012-07-033761-006-0755ND
2012-07-033761-010-08255.90 ppb
2012-07-033761-012-0900ND
2012-07-113761-006-0730ND
2012-07-183761-006-0725ND
2012-07-199588-005-0800ND
2012-07-199588-010-08154.20 ppb
2012-07-253761-006-0725ND
2012-08-013761-005-0800ND
2012-08-013761-006-0815ND
2012-08-013761-010-07454.20 ppb
2012-08-013761-012-0720ND
2012-08-083761-006-0745ND
2012-08-153761-006-0600ND
2012-08-223761-006-0700ND
2012-08-293761-006-0730ND
2012-09-053761-005-08004.60 ppb
2012-09-053761-006-0815ND
2012-09-053761-010-07455.00 ppb
2012-09-053761-012-0730ND
2012-09-123761-006-0725ND
2012-09-193761-006-0725ND
2012-09-263761-006-0715ND
2012-10-033761-005-0805ND
2012-10-033761-006-0820ND
2012-10-033761-010-07506.10 ppb
2012-10-033761-012-07305.40 ppb
2012-10-049588-005-08355.10 ppb
2012-10-049588-010-08454.50 ppb
2012-10-083761-012-0840ND
2012-10-103761-006-0900ND
2012-10-173761-006-0730ND
2012-10-243761-006-0810ND
2012-10-313761-006-0750ND
2012-11-073761-005-07304.00 ppb
2012-11-073761-006-0815ND
2012-11-073761-010-07505.30 ppb
2012-11-073761-012-0805ND
2012-11-133761-006-0725ND
2012-11-213761-006-0715ND
2012-11-283761-006-0720ND
2012-12-053761-005-0820ND
2012-12-053761-006-0830ND
2012-12-053761-010-07454.00 ppb
2012-12-053761-012-0735ND
2012-12-123761-006-0730ND
2012-12-193761-006-0820ND
2012-12-263761-006-0800ND
2013-01-023761-005-0805ND
2013-01-023761-006-0820ND
2013-01-023761-010-07505.80 ppb
2013-01-023761-012-0735ND
2013-01-093761-006-0740ND
2013-01-109588-005-0810ND
2013-01-109588-010-08004.70 ppb
2013-01-163761-006-1125ND
2013-01-233761-006-0730ND
2013-01-303761-006-0730ND
2013-02-053761-005-0800ND
2013-02-053761-010-0715ND
2013-02-053761-012-0730ND
2013-03-273761-006-0750ND
2013-04-033761-006-0845ND
2013-04-033761-010-07304.80 ppb
2013-04-033761-012-0745ND
2013-04-089588-005-0805ND
2013-04-089588-010-08106.20 ppb
2013-04-089588-012-0820ND
2013-04-103761-006-0730ND
2013-04-173761-006-0725ND
2013-04-243761-006-0830ND
2013-05-013761-005-0810ND
2013-05-013761-006-0830ND
2013-05-013761-010-07456.20 ppb
2013-05-013761-012-0730ND
2013-05-083761-006-0730ND
2013-05-153761-006-0800ND
2013-05-223761-006-0745ND
2013-05-293761-006-0730ND
2013-06-053761-005-0800ND
2013-06-053761-006-0810ND
2013-06-053761-010-07454.10 ppb
2013-06-053761-012-0730ND
2013-06-123761-006-0745ND
2013-06-193761-006-0830ND
2013-06-263761-006-0740ND
2013-07-033761-005-0815ND
2013-07-033761-006-0840ND
2013-07-033761-010-08004.20 ppb
2013-07-033761-012-0740ND
2013-07-099588-005-07454.70 ppb
2013-07-099588-010-07356.10 ppb
2013-07-103761-006-0720ND
2013-07-173761-006-0740ND
2013-07-243761-006-0745ND
2013-07-313761-006-0920ND
2013-08-073761-005-08305.60 ppb
2013-08-073761-006-0840ND
2013-08-073761-010-08106.40 ppb
2013-08-073761-012-0850ND
2013-08-143761-006-0740ND
2013-08-213761-006-07404.40 ppb
2013-09-043761-005-08004.60 ppb
2013-09-043761-006-0805ND
2013-09-043761-010-07456.30 ppb
2013-09-043761-012-0725ND
2013-09-113761-006-0755ND
2013-09-183761-006-0750ND
2013-09-253761-006-08004.20 ppb
2013-10-023761-005-08154.40 ppb
2013-10-023761-006-0830ND
2013-10-023761-010-08055.60 ppb
2013-10-023761-012-0745ND
2013-10-093761-006-0750ND
2013-10-169588-005-0825ND
2013-10-163761-006-0750ND
2013-10-169588-010-08105.70 ppb
2013-10-233761-006-0800ND
2013-10-303761-006-0800ND
2013-11-063761-005-0815ND
2013-11-063761-006-0825ND
2013-11-063761-010-07505.20 ppb
2013-11-063761-012-0730ND
2013-11-133761-006-0745ND
2013-11-203761-006-0750ND
2013-11-273761-006-0730ND
2013-12-043761-005-0730ND
2013-12-043761-006-0825ND
2013-12-043761-010-07155.00 ppb
2013-12-043761-012-0700ND
2013-12-113761-006-0720ND
2013-12-183761-006-0730ND
2013-12-243761-006-0750ND
2013-12-313761-005-0730ND
2013-12-313761-006-0825ND
2013-12-313761-010-07154.70 ppb
2013-12-313761-012-0700ND
2014-01-079588-005-0740ND
2014-01-079588-010-07305.60 ppb
2014-01-083761-006-0740ND
2014-01-153761-006-0730ND
2014-01-223761-006-0720ND
2014-01-293761-006-0800ND
2014-02-053761-005-0830ND
2014-02-053761-006-0745ND
2014-02-053761-010-0715ND
2014-02-053761-012-0700ND
2014-02-123761-006-0715ND
2014-02-193761-006-1025ND
2014-02-263761-006-0740ND
2014-03-053761-005-0720ND
2014-03-053761-006-0750ND
2014-03-053761-010-07054.70 ppb
2014-03-053761-012-0730ND
2014-03-123761-006-0745ND
2014-03-193761-006-0755ND
2014-03-263761-006-0720ND
2014-04-023761-005-0745ND
2014-04-023761-006-0755ND
2014-04-023761-010-07305.90 ppb
2014-04-023761-012-0715ND
2014-04-089588-005-0745ND
2014-04-089588-010-07305.60 ppb
2014-04-089588-012-0735ND
2014-04-093761-006-0725ND
2014-04-163761-006-0750ND
2014-04-233761-006-0715ND
2014-04-303761-006-0805ND
2014-05-073761-005-0730ND
2014-05-073761-006-0740ND
2014-05-073761-012-0715ND
2014-05-143761-006-0915ND
2014-05-213761-006-0815ND
2014-05-283761-006-0735ND
2014-05-283761-010-07205.70 ppb
2014-06-043761-005-0745ND
2014-06-043761-006-0740ND
2014-06-043761-010-07204.90 ppb
2014-06-043761-012-0730ND
2014-06-113761-006-0720ND
2014-06-183761-006-0720ND
2014-06-253761-006-0735ND
2014-07-023761-005-0745ND
2014-07-023761-006-0755ND
2014-07-023761-010-0710ND
2014-07-023761-012-0720ND
2014-07-093761-006-0810ND
2014-07-119588-005-1140ND
2014-07-119588-010-11054.80 ppb
2014-07-163761-006-0820ND
2014-07-233761-006-0740ND
2014-07-303761-006-0745ND
2014-08-063761-005-0750ND
2014-08-063761-006-0810ND
2014-08-063761-010-07207.70 ppb
2014-08-063761-012-0735ND
2014-08-133761-006-0745ND
2014-08-203761-006-0800ND
2014-08-273761-006-0735ND
2014-09-033761-005-0745ND
2014-09-033761-006-0755ND
2014-09-033761-010-07206.70 ppb
2014-09-033761-012-0730ND
2014-09-103761-006-0710ND
2014-09-173761-006-0800ND
2014-09-243761-006-0735ND
2014-10-013761-005-0800ND
2014-10-013761-006-0810ND
2014-10-013761-010-07104.20 ppb
2014-10-013761-012-0730ND
2014-10-089588-005-0745ND
2014-10-083761-006-0720ND
2014-10-089588-010-07306.70 ppb
2014-10-153761-006-0845ND
2014-10-223761-006-0755ND
2014-10-293761-006-0740ND
2014-11-263761-006-0735ND
2014-12-033761-005-0740ND
2014-12-033761-006-0720ND
2014-12-033761-010-0710ND
2014-12-033761-012-0720ND
2014-12-103761-006-0735ND
2014-12-173761-006-0730ND
2014-12-243761-006-0930ND
2014-12-313761-006-0745ND
2015-01-073761-005-0800ND
2015-01-079588-005-0810ND
2015-01-073761-006-0810ND
2015-01-073761-010-07454.70 ppb
2015-01-079588-010-08005.00 ppb
2015-01-073761-012-0730ND
2015-01-143761-006-0720ND
2015-01-213761-006-0710ND
2015-01-283761-006-0745ND
2015-02-043761-005-0745ND
2015-02-043761-006-0800ND
2015-02-043761-010-07305.20 ppb
2015-02-043761-012-0715ND
2015-02-113761-006-0745ND
2015-02-183761-006-0745ND
2015-02-253761-006-0800ND
2015-03-043761-005-0800ND
2015-03-043761-006-0815ND
2015-03-043761-010-07107.00 ppb
2015-03-043761-012-0725ND
2015-03-123761-006-0700ND
2015-03-183761-006-0710ND
2015-03-253761-006-0715ND
2015-04-013761-005-0740ND
2015-04-013761-006-0800ND
2015-04-013761-010-07006.10 ppb
2015-04-013761-012-0715ND
2015-04-083761-006-0700ND
2015-04-099588-005-0815ND
2015-04-099588-010-07506.40 ppb
2015-04-099588-012-0800ND
2015-04-153761-006-0650ND
2015-04-223761-006-0810ND
2015-04-293761-006-0740ND
2015-05-063761-006-0725ND
2015-05-063761-010-07155.40 ppb
2015-05-063761-012-0735ND
2015-05-133761-005-0700ND
2015-05-133761-006-0720ND
2015-05-273761-006-0715ND
2015-06-033761-006-0800ND
2015-06-033761-010-07204.50 ppb
2015-06-033761-012-0740ND
2015-06-113761-006-0740ND
2015-06-243761-006-0735ND
2015-07-013761-006-0725ND
2015-07-013761-010-07055.70 ppb
2015-07-013761-012-0715ND
2015-07-083761-006-0720ND
2015-07-163761-006-0715ND
2015-07-169588-010-07455.40 ppb
2015-07-223761-006-0720ND
2015-07-293761-006-0745ND
2015-08-053761-006-0800ND
2015-08-053761-010-07304.90 ppb
2015-08-053761-012-0745ND
2015-08-123761-006-0720ND
2015-08-173761-005-0800ND
2015-08-193761-006-0715ND
2015-08-263761-006-0800ND
2015-09-023761-006-0705ND
2015-09-023761-010-06406.10 ppb
2015-09-023761-012-0655ND
2015-09-093761-006-0715ND
2015-09-163761-006-0715ND
2015-09-233761-006-0740ND
2015-09-303761-006-0730ND
2015-10-073761-006-0820ND
2015-10-073761-010-07106.70 ppb
2015-10-073761-012-0720ND
2015-10-143761-006-0715ND
2015-10-169588-010-07505.80 ppb
2015-10-213761-006-0730ND
2015-11-043761-006-07304.40 ppb
2015-11-043761-010-07007.10 ppb
2015-11-043761-012-0710ND
2015-11-113761-006-07154.50 ppb
2015-11-183761-006-07154.20 ppb
2015-11-253761-006-07454.30 ppb
2015-12-023761-006-0710ND
2015-12-023761-010-07007.50 ppb
2015-12-023761-012-0720ND
2015-12-093761-006-0740ND
2015-12-163761-006-07104.10 ppb
2015-12-233761-006-0740ND
2015-12-303761-006-0830ND
2016-01-059588-010-08006.20 ppb
2016-01-059588-012-0810ND
2016-01-063761-006-0750ND
2016-01-063761-010-07206.90 ppb
2016-01-063761-012-0730ND
2016-01-133761-006-0840ND
2016-01-203761-006-0810ND
2016-01-273761-006-0830ND
2016-02-033761-006-0750ND
2016-02-033761-010-07155.40 ppb
2016-02-033761-012-0730ND
2016-02-103761-006-0840ND
2016-02-173761-006-0825ND
2016-02-243761-006-0815ND
2016-03-023761-006-0745ND
2016-03-023761-010-07157.50 ppb
2016-03-023761-012-0725ND
2016-03-093761-006-0830ND
2016-03-163761-006-0825ND
2016-03-233761-006-0825ND
2016-04-063761-005-0800ND
2016-04-069588-005-0810ND
2016-04-063761-006-0745ND
2016-04-063761-010-07205.00 ppb
2016-04-069588-010-07505.40 ppb
2016-04-069588-012-0815ND
2016-04-063761-012-0820ND
2016-04-133761-006-0815ND
2016-04-273761-006-0845ND
2016-05-043761-006-08354.00 ppb
2016-05-043761-010-07357.60 ppb
2016-05-043761-012-0720ND
2016-05-113761-006-0930ND
2016-05-183761-006-0840ND
2016-05-253761-006-0800ND
2016-06-013761-006-0815ND
2016-06-013761-010-06556.90 ppb
2016-06-013761-012-0710ND
2016-06-083761-006-0745ND
2016-06-153761-006-0810ND
2016-06-223761-006-0910ND
2016-06-293761-006-0820ND
2016-07-063761-006-0800ND
2016-07-063761-010-07007.40 ppb
2016-07-063761-012-0715ND
2016-07-133761-006-0815ND
2016-07-159588-010-08305.90 ppb
2016-07-203761-006-0815ND
2016-07-273761-006-0755ND
2016-08-033761-006-0705ND
2016-08-033761-010-06506.00 ppb
2016-08-033761-012-0700ND
2016-08-103761-006-0800ND
2016-08-173761-006-0715ND
2016-08-243761-006-0900ND
2016-08-313761-006-0725ND
2016-09-073761-006-0800ND
2016-09-073761-010-07008.20 ppb
2016-09-073761-012-0715ND
2016-09-143761-006-0815ND
2016-09-213761-006-0810ND
2016-09-283761-006-0915ND
2016-10-053761-006-0900ND
2016-10-053761-010-07206.60 ppb
2016-10-053761-012-0735ND
2016-10-123761-006-0815ND
2016-10-149588-010-08104.10 ppb
2016-10-193761-006-0830ND
2016-10-263761-006-0745ND
2016-11-023761-006-0710ND
2016-11-023761-010-06506.60 ppb
2016-11-023761-012-0705ND
2016-11-093761-006-0810ND
2016-11-163761-006-0810ND
2016-11-233761-006-0800ND
2016-11-303761-006-0845ND
2016-12-073761-006-0725ND
2016-12-073761-010-07055.90 ppb
2016-12-073761-012-0715ND
2016-12-143761-006-08154.30 ppb
2016-12-213761-006-0820ND
2016-12-283761-006-0800ND
2017-01-043761-006-0745ND
2017-01-043761-010-07307.00 ppb
2017-01-063761-005-1030ND
2017-01-113761-006-0820ND
2017-01-129588-005-0745ND
2017-01-129588-010-07357.20 ppb
2017-01-183761-006-0855ND
2017-02-083761-006-0815ND
2017-02-153761-006-0835ND
2017-02-223761-006-0810ND
2017-03-013761-006-0800ND
2017-03-013761-010-07105.30 ppb
2017-03-013761-012-0730ND
2017-03-083761-006-0740ND
2017-03-153761-006-0900ND
2017-03-223761-006-0900ND
2017-03-293761-006-0920ND
2017-04-053761-006-0800ND
2017-04-053761-010-07306.00 ppb
2017-04-053761-012-0740ND
2017-04-123761-006-0840ND
2017-04-189588-005-0910ND
2017-04-189588-010-09255.10 ppb
2017-04-189588-012-0935ND
2017-04-193761-006-0900ND
2017-04-263761-006-0840ND
2017-05-033761-006-0815ND
2017-05-033761-010-07207.20 ppb
2017-05-033761-012-0730ND
2017-05-103761-006-0750ND
2017-05-173761-006-0800ND
2017-05-243761-006-0750ND
2017-05-313761-006-0800ND
2017-06-073761-006-0745ND
2017-06-073761-010-07206.20 ppb
2017-06-073761-012-0735ND
2017-06-143761-006-0800ND
2017-06-213761-006-0900ND
2017-06-283761-006-0740ND
2017-07-129588-005-0905ND
2017-07-123761-006-0940ND
2017-07-129588-010-08505.50 ppb
2017-07-193761-006-0900ND
2017-07-263761-006-0750ND
2017-08-023761-005-0715ND
2017-08-023761-006-0825ND
2017-08-023761-010-07004.90 ppb
2017-08-023761-012-0730ND
2017-08-093761-006-0840ND
2017-08-163761-006-0830ND
2017-08-163761-010-07006.40 ppb
2017-08-163761-012-0715ND
2017-08-233761-006-0740ND
2017-08-303761-006-0810ND
2017-09-063761-006-0825ND
2017-09-063761-010-07207.10 ppb
2017-09-063761-012-0705ND
2017-09-133761-006-0845ND
2017-09-203761-006-0825ND
2017-09-273761-006-0850ND
2017-10-043761-006-0745ND
2017-10-043761-010-07207.50 ppb
2017-10-043761-012-0730ND
2017-10-113761-006-0810ND
2017-10-119588-010-08057.70 ppb
2017-10-183761-006-0850ND
2017-11-013761-006-07404.30 ppb
2017-11-013761-010-07207.90 ppb
2017-11-013761-012-07304.20 ppb
2017-11-083761-006-0730ND
2017-11-153761-006-0820ND
2017-11-223761-006-0730ND
2017-11-293761-006-0810ND
2017-12-063761-006-0720ND
2017-12-063761-010-07007.20 ppb
2017-12-063761-012-0710ND
2017-12-133761-006-0750ND
2017-12-203761-006-0800ND
2017-12-273761-006-0915ND