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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Fairview Water Company LLC

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.

MORE ABOUT THIS CONTAMINANT

 

198

Samples

0

Samples exceeding legal limit (MCL)

68

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.63 ppb197ND - 10.00 ppb
20153.79 ppb1810ND - 13.0 ppb
20163.52 ppb7335ND - 16.0 ppb
20172.33 ppb398ND - 15.0 ppb
20181.70 ppb255ND - 14.0 ppb
20190.529 ppb243ND - 4.70 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
2014-01-285810-001-130010.00 ppb
2014-01-285810-003-1320ND
2014-03-255810-005-09454.20 ppb
2014-04-155810-001-14408.20 ppb
2014-04-155810-003-1520ND
2014-04-155810-005-1430ND
2014-05-275810-005-0945ND
2014-06-235810-005-1005ND
2014-07-225810-001-12558.40 ppb
2014-07-225810-003-1230ND
2014-07-225810-005-1245ND
2014-08-195810-005-0950ND
2014-09-255810-005-1415ND
2014-10-205810-001-133010.00 ppb
2014-10-205810-003-1410ND
2014-10-205810-005-1320ND
2014-11-185810-005-13104.30 ppb
2014-12-185810-005-10004.80 ppb
2014-12-225806-003-1430ND
2015-01-265810-001-135010.00 ppb
2015-01-265810-003-1410ND
2015-01-265810-005-14254.10 ppb
2015-02-125810-005-09504.40 ppb
2015-03-175810-005-0930ND
2015-04-205806-001-134013.0 ppb
2015-04-205806-003-1310ND
2015-04-205806-005-13304.70 ppb
2015-05-205806-005-10154.60 ppb
2015-07-275806-001-125012.0 ppb
2015-07-275806-003-1315ND
2015-08-175806-005-1345ND
2015-09-095806-005-07054.10 ppb
2015-10-275806-001-13006.20 ppb
2015-10-275806-003-1320ND
2015-10-275806-005-1335ND
2015-11-185806-005-0930ND
2015-12-285806-005-04485.10 ppb
2016-01-075806-005-13156.60 ppb
2016-01-115806-005-09256.70 ppb
2016-01-185806-001-134012.0 ppb
2016-01-185806-003-1435ND
2016-01-185806-005-1400ND
2016-01-205806-001-09558.90 ppb
2016-01-205806-003-1130ND
2016-01-205806-005-1010ND
2016-01-255806-001-144014.0 ppb
2016-01-255806-003-1500ND
2016-01-255806-005-1450ND
2016-01-315806-005-1340ND
2016-02-045806-005-0220ND
2016-02-115806-005-01354.20 ppb
2016-02-165806-005-08554.40 ppb
2016-02-225806-005-1200ND
2016-03-105806-005-09154.40 ppb
2016-03-165806-005-15004.40 ppb
2016-03-205806-005-17504.50 ppb
2016-03-295806-005-14404.50 ppb
2016-04-065806-001-090011.0 ppb
2016-04-065806-003-0915ND
2016-04-065806-005-0930ND
2016-04-115806-005-1600ND
2016-04-215806-005-1100ND
2016-04-285806-005-1440ND
2016-05-055806-005-08304.30 ppb
2016-05-105806-005-0930ND
2016-05-175806-005-1340ND
2016-05-235806-005-1025ND
2016-06-075806-001-131513.0 ppb
2016-06-075806-003-1330ND
2016-06-075806-005-1340ND
2016-06-145806-005-1020ND
2016-06-215806-005-0940ND
2016-06-275806-005-14054.10 ppb
2016-07-075806-005-1430ND
2016-07-115806-005-16304.30 ppb
2016-07-185806-001-115516.0 ppb
2016-07-185806-003-1215ND
2016-07-185806-005-1235ND
2016-07-275806-005-14204.90 ppb
2016-08-035806-005-04304.10 ppb
2016-08-105806-001-122512.0 ppb
2016-08-105806-003-1300ND
2016-08-105806-005-13154.00 ppb
2016-08-155806-005-09354.40 ppb
2016-08-235806-005-09154.70 ppb
2016-09-075806-001-12309.60 ppb
2016-09-075806-005-1310ND
2016-09-135806-005-09154.40 ppb
2016-09-225806-005-12006.00 ppb
2016-09-275806-005-10204.80 ppb
2016-10-055806-005-05304.30 ppb
2016-10-115806-001-134015.0 ppb
2016-10-115806-003-1400ND
2016-10-115806-005-14204.30 ppb
2016-10-185806-005-1140ND
2016-10-315806-005-1345ND
2016-11-025806-005-1330ND
2016-11-095806-001-130013.0 ppb
2016-11-095806-003-1335ND
2016-11-095806-005-1350ND
2016-11-155806-005-10504.50 ppb
2016-11-295806-005-14454.70 ppb
2016-12-065806-001-133512.0 ppb
2016-12-065806-003-1350ND
2016-12-065806-005-1405ND
2016-12-155806-005-0940ND
2016-12-205806-005-1430ND
2016-12-265806-001-135013.0 ppb
2016-12-265806-003-1300ND
2016-12-285806-005-1400ND
2017-01-095806-001-143015.0 ppb
2017-01-095806-003-14455.00 ppb
2017-01-095806-005-1455ND
2017-01-165806-005-14254.80 ppb
2017-01-269588-005-1345ND
2017-02-125806-005-1350ND
2017-02-165806-001-130015.0 ppb
2017-02-165806-003-1315ND
2017-02-165806-005-1330ND
2017-02-205806-005-1600ND
2017-02-285806-005-1445ND
2017-03-075806-005-1500ND
2017-03-155806-001-134015.0 ppb
2017-03-155806-003-1355ND
2017-03-155806-005-1410ND
2017-03-275806-005-0645ND
2017-03-305806-005-0400ND
2017-04-055806-005-1700ND
2017-04-135806-005-0745ND
2017-04-305806-001-020011.0 ppb
2017-04-305806-003-0205ND
2017-05-315806-003-1545ND
2017-05-315806-005-1555ND
2017-06-295806-003-0620ND
2017-06-295806-005-0630ND
2017-07-315806-003-1610ND
2017-07-315806-005-1625ND
2017-08-245806-001-135012.0 ppb
2017-08-245806-003-1405ND
2017-08-245806-005-1415ND
2017-09-195806-003-1220ND
2017-09-195806-005-1230ND
2017-10-165806-001-140513.0 ppb
2017-10-165806-003-1425ND
2017-10-165806-005-1440ND
2017-11-135806-003-1210ND
2017-11-135806-005-1220ND
2017-12-215806-003-0830ND
2017-12-215806-005-0835ND
2018-01-115806-001-1210ND
2018-01-115806-005-1150ND
2018-02-205806-003-0950ND
2018-02-205806-005-0940ND
2018-03-275806-003-1345ND
2018-03-275806-005-1400ND
2018-04-165806-003-0915ND
2018-04-165806-005-1015ND
2018-05-305806-003-1050ND
2018-05-305806-005-1000ND
2018-06-185806-003-1030ND
2018-06-185806-005-1050ND
2018-07-195806-001-104014.0 ppb
2018-07-195806-003-1145ND
2018-07-195806-005-1120ND
2018-08-235806-003-0840ND
2018-08-235806-005-0910ND
2018-09-115806-003-1230ND
2018-09-115806-005-12358.70 ppb
2018-10-115806-003-07454.10 ppb
2018-10-115806-005-0730ND
2018-11-285806-003-09007.80 ppb
2018-11-285806-005-09307.80 ppb
2018-12-265806-003-0959ND
2018-12-265806-005-1030ND
2019-01-095806-003-1130ND
2019-01-095806-005-1155ND
2019-02-275806-003-1200ND
2019-02-275806-005-1242ND
2019-03-285806-003-1000ND
2019-03-285806-005-0915ND
2019-04-255806-003-1345ND
2019-04-255806-005-1315ND
2019-05-135806-003-1530ND
2019-05-135806-005-1535ND
2019-06-195806-003-0945ND
2019-06-195806-005-0915ND
2019-07-315806-003-1015ND
2019-07-315806-005-0950ND
2019-08-225806-003-1005ND
2019-08-225806-005-1035ND
2019-09-265806-003-1430ND
2019-09-265806-005-1450ND
2019-10-165806-003-1105ND
2019-10-165806-005-15254.00 ppb
2019-11-135806-003-0953ND
2019-11-135806-005-10354.70 ppb
2019-12-115806-003-1030ND
2019-12-115806-005-10454.00 ppb