Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Perchlorate

San Gabriel Valley Water Company - Fontana

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

 

617

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.111 ppb1233ND - 5.20 ppb
20150.115 ppb892ND - 6.00 ppb
20160.424 ppb848ND - 9.50 ppb
2017ND1040ND
20180.0833 ppb1205ND - 3.00 ppb
2019ND970ND

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
2014-01-089588-003-1130ND
2014-01-089588-043-0910ND
2014-01-089588-063-0830ND
2014-01-089588-064-0900ND
2014-01-109588-001-1045ND
2014-01-213761-006-1100ND
2014-01-213761-007-1050ND
2014-01-213761-011-1035ND
2014-01-213761-020-1045ND
2014-01-213761-022-1150ND
2014-01-213761-023-1120ND
2014-01-213761-026-0845ND
2014-01-213761-028-1135ND
2014-01-213761-031-1000ND
2014-01-213761-034-0915ND
2014-01-213761-041-0930ND
2014-01-213761-043-0920ND
2014-01-213761-044-1200ND
2014-01-213761-045-1010ND
2014-01-213761-063-0938ND
2014-01-213761-064-0930ND
2014-01-213761-065-0845ND
2014-01-213761-068-1100ND
2014-01-213761-072-0905ND
2014-01-229588-022-1145ND
2014-01-229588-023-1030ND
2014-01-229588-028-1110ND
2014-01-283761-014-09055.20 ppb
2014-02-059588-043-0835ND
2014-02-059588-063-0800ND
2014-02-059588-064-0825ND
2014-03-059588-043-0935ND
2014-03-059588-063-0905ND
2014-03-059588-064-0925ND
2014-03-139588-077-1100ND
2014-03-183761-024-0805ND
2014-03-199588-006-0910ND
2014-03-199588-007-1000ND
2014-03-209588-077-0840ND
2014-03-269588-011-0900ND
2014-04-029588-043-0915ND
2014-04-029588-063-0840ND
2014-04-029588-064-0905ND
2014-04-073761-026-0800ND
2014-04-073761-065-0815ND
2014-04-169588-043-0850ND
2014-04-169588-044-1100ND
2014-04-169588-045-1010ND
2014-04-169588-064-0920ND
2014-04-179588-014-08354.30 ppb
2014-04-179588-031-0745ND
2014-04-179588-077-1146ND
2014-05-149588-043-1030ND
2014-05-149588-063-0945ND
2014-05-149588-064-1020ND
2014-05-169588-077-1305ND
2014-05-219588-063-0725ND
2014-06-049588-043-0810ND
2014-06-049588-063-0740ND
2014-06-049588-064-0800ND
2014-06-099588-070-1025ND
2014-06-109588-077-1002ND
2014-06-249588-070-0905ND
2014-06-249588-077-1105ND
2014-07-029588-043-0855ND
2014-07-029588-063-0820ND
2014-07-029588-064-0845ND
2014-07-029588-070-1220ND
2014-07-029588-077-1035ND
2014-07-073761-026-1035ND
2014-07-073761-065-0950ND
2014-07-099588-065-0850ND
2014-07-099588-068-1000ND
2014-07-099588-070-0905ND
2014-07-099588-077-1020ND
2014-07-169588-014-08004.20 ppb
2014-07-169588-070-0905ND
2014-07-169588-077-0935ND
2014-07-239588-026-0740ND
2014-07-239588-034-0945ND
2014-07-239588-072-0910ND
2014-07-249588-041-0800ND
2014-07-249588-070-0940ND
2014-07-249588-077-1050ND
2014-07-309588-070-0915ND
2014-07-319588-024-0740ND
2014-07-319588-077-0855ND
2014-08-069588-027-1020ND
2014-08-069588-043-0835ND
2014-08-069588-063-0825ND
2014-08-079588-077-0755ND
2014-08-139588-070-0800ND
2014-08-149588-077-0910ND
2014-08-209588-070-1105ND
2014-08-209588-077-1015ND
2014-08-279588-077-0945ND
2014-09-029588-043-0840ND
2014-09-029588-063-0730ND
2014-09-029588-077-1045ND
2014-09-089588-070-1100ND
2014-09-089588-077-0910ND
2014-09-159588-077-1125ND
2014-09-169588-070-1100ND
2014-09-229588-077-1110ND
2014-09-239588-070-0910ND
2014-09-299588-077-0950ND
2014-09-309588-070-0955ND
2014-10-063761-026-0805ND
2014-10-069588-043-1240ND
2014-10-069588-063-1150ND
2014-10-063761-065-0910ND
2014-10-069588-070-1010ND
2014-10-069588-077-0835ND
2014-10-149588-070-1045ND
2014-10-219588-070-0810ND
2014-10-299588-077-1040ND
2014-11-039588-043-0840ND
2014-11-039588-063-0810ND
2014-11-109588-064-0000ND
2014-12-019588-043-0815ND
2014-12-019588-063-1115ND
2014-12-019588-064-0820ND
2014-12-109588-070-1020ND
2015-01-059588-043-0845ND
2015-01-059588-063-0740ND
2015-01-123761-007-1250ND
2015-01-123761-011-1220ND
2015-01-123761-020-1205ND
2015-01-123761-022-0935ND
2015-01-123761-023-0900ND
2015-01-123761-024-0830ND
2015-01-123761-026-1140ND
2015-01-123761-027-1315ND
2015-01-123761-028-0915ND
2015-01-123761-031-1000ND
2015-01-123761-034-0930ND
2015-01-123761-041-1200ND
2015-01-123761-043-1115ND
2015-01-123761-044-0815ND
2015-01-123761-045-1010ND
2015-01-123761-063-1100ND
2015-01-123761-065-1010ND
2015-01-123761-068-1005ND
2015-01-123761-072-0940ND
2015-01-159588-077-1115ND
2015-01-229588-064-0805ND
2015-01-299588-077-1020ND
2015-01-309588-001-0815ND
2015-01-309588-003-0915ND
2015-01-309588-011-1050ND
2015-01-309588-022-0750ND
2015-01-309588-023-0845ND
2015-01-309588-027-1030ND
2015-02-029588-043-0845ND
2015-02-029588-063-0750ND
2015-02-029588-064-0815ND
2015-02-053761-014-08454.20 ppb
2015-02-269588-007-0855ND
2015-02-269588-020-0820ND
2015-02-269588-028-0745ND
2015-03-029588-043-0835ND
2015-03-029588-063-1010ND
2015-03-029588-064-0840ND
2015-03-129588-031-0800ND
2015-03-129588-044-0900ND
2015-03-129588-045-0740ND
2015-03-239588-043-0810ND
2015-03-239588-064-0750ND
2015-04-069588-043-0855ND
2015-04-069588-064-0850ND
2015-04-133761-024-0915ND
2015-04-133761-065-0930ND
2015-04-143761-026-0940ND
2015-04-279588-026-0840ND
2015-05-049588-064-0835ND
2015-05-123761-026-1010ND
2015-05-139588-070-1045ND
2015-05-139588-077-1225ND
2015-05-189588-024-0800ND
2015-05-189588-065-0900ND
2015-05-189588-068-0945ND
2015-06-019588-064-0755ND
2015-06-159588-034-0800ND
2015-06-159588-041-0715ND
2015-06-159588-072-0740ND
2015-07-019588-070-1018ND
2015-07-099588-043-0630ND
2015-07-153761-024-0720ND
2015-07-153761-041-0730ND
2015-07-153761-068-0740ND
2015-07-153761-082-1300ND
2015-07-163761-082-0810ND
2015-07-173761-082-0800ND
2015-08-039588-043-0840ND
2015-08-039588-064-0830ND
2015-08-199588-014-1030ND
2015-08-199588-077-1028ND
2015-08-279588-077-0925ND
2015-09-083761-026-0900ND
2015-09-089588-043-0935ND
2015-09-089588-064-0930ND
2015-10-059588-043-0815ND
2015-10-059588-064-0805ND
2015-10-143761-063-1420ND
2015-10-269588-063-1000ND
2015-11-103761-026-0915ND
2015-11-133761-024-0720ND
2015-11-133761-065-0710ND
2015-11-193761-014-08306.00 ppb
2015-12-079588-043-0820ND
2015-12-079588-063-0755ND
2015-12-079588-064-0815ND
2016-01-113761-014-10005.20 ppb
2016-01-119588-043-0825ND
2016-01-119588-063-0740ND
2016-01-119588-064-0830ND
2016-01-123761-007-1155ND
2016-01-123761-020-1145ND
2016-01-123761-022-1100ND
2016-01-123761-023-1120ND
2016-01-123761-024-0840ND
2016-01-123761-028-1110ND
2016-01-123761-034-0935ND
2016-01-123761-041-0830ND
2016-01-123761-065-0820ND
2016-01-123761-068-0920ND
2016-01-123761-072-0930ND
2016-01-193761-001-1250ND
2016-01-193761-003-0940ND
2016-01-259588-001-1030ND
2016-01-259588-003-0910ND
2016-02-019588-043-0835ND
2016-02-019588-063-1005ND
2016-02-019588-064-0830ND
2016-02-179588-007-0925ND
2016-02-179588-022-0900ND
2016-02-179588-023-0850ND
2016-02-179588-028-0830ND
2016-02-179588-043-1030ND
2016-02-179588-063-1005ND
2016-02-179588-064-1020ND
2016-03-089588-043-0800ND
2016-03-089588-063-0730ND
2016-03-089588-064-0750ND
2016-03-149588-026-1100ND
2016-03-149588-068-0950ND
2016-04-049588-043-0925ND
2016-04-049588-063-0820ND
2016-04-049588-064-0830ND
2016-04-113761-026-10151.30 ppb
2016-04-133761-024-0815ND
2016-04-133761-041-0820ND
2016-04-133761-065-0730ND
2016-04-133761-068-0725ND
2016-05-049588-065-0745ND
2016-05-239588-027-0910ND
2016-06-069588-043-0935ND
2016-06-069588-063-0800ND
2016-06-069588-064-0925ND
2016-06-239588-070-0955ND
2016-06-239588-077-0805ND
2016-06-309588-024-0740ND
2016-06-309588-034-0820ND
2016-06-309588-041-0720ND
2016-06-309588-072-0810ND
2016-07-059588-043-0835ND
2016-07-053761-063-0815ND
2016-07-059588-063-0815ND
2016-07-059588-064-0850ND
2016-07-113761-026-1000ND
2016-07-133761-024-07103.10 ppb
2016-07-133761-065-0650ND
2016-07-133761-068-0655ND
2016-08-019588-043-0845ND
2016-08-019588-063-1025ND
2016-08-019588-064-0835ND
2016-08-229588-077-0830ND
2016-08-233761-014-10205.40 ppb
2016-09-069588-063-0805ND
2016-09-069588-064-0815ND
2016-09-289588-077-1140ND
2016-10-039588-043-0830ND
2016-10-039588-063-0800ND
2016-10-039588-064-0825ND
2016-10-113761-026-11301.50 ppb
2016-10-133761-041-08003.80 ppb
2016-10-133761-065-0810ND
2016-10-133761-068-0820ND
2016-10-313761-014-11555.80 ppb
2016-11-079588-043-1045ND
2016-11-079588-063-0800ND
2016-11-079588-064-1035ND
2016-11-299588-035-09309.50 ppb
2016-12-059588-043-0815ND
2016-12-059588-063-0745ND
2016-12-059588-064-0810ND
2017-01-039588-043-0805ND
2017-01-039588-063-0815ND
2017-01-039588-064-0800ND
2017-01-103761-022-1020ND
2017-01-103761-023-1030ND
2017-01-103761-034-1000ND
2017-01-103761-043-0838ND
2017-01-103761-063-0857ND
2017-01-103761-064-0830ND
2017-01-103761-065-0945ND
2017-01-103761-068-0940ND
2017-01-103761-072-0955ND
2017-01-113761-001-0800ND
2017-01-113761-003-0825ND
2017-01-113761-007-0800ND
2017-01-113761-026-0740ND
2017-01-113761-027-0800ND
2017-01-113761-028-0750ND
2017-02-019588-001-0935ND
2017-02-019588-003-0810ND
2017-02-069588-043-1045ND
2017-02-069588-063-0940ND
2017-02-069588-064-1035ND
2017-02-079588-007-1030ND
2017-02-079588-027-1000ND
2017-02-079588-028-0930ND
2017-02-239588-020-1030ND
2017-02-239588-022-1040ND
2017-02-239588-023-1020ND
2017-02-249588-026-0830ND
2017-02-249588-043-0920ND
2017-02-249588-063-0930ND
2017-02-249588-064-0910ND
2017-03-069588-043-0845ND
2017-03-069588-063-0810ND
2017-03-069588-064-0840ND
2017-03-319588-006-1010ND
2017-04-039588-043-0745ND
2017-04-039588-063-0915ND
2017-04-039588-064-0740ND
2017-04-103761-026-0710ND
2017-04-113761-065-0815ND
2017-04-113761-068-0800ND
2017-05-029588-043-0820ND
2017-05-029588-063-0920ND
2017-05-029588-064-0815ND
2017-05-089588-011-1105ND
2017-05-099588-024-1005ND
2017-05-099588-041-0925ND
2017-06-059588-043-0810ND
2017-06-059588-063-0730ND
2017-06-059588-064-0800ND
2017-06-199588-034-0910ND
2017-06-199588-072-0850ND
2017-06-229588-070-1140ND
2017-06-229588-077-1110ND
2017-06-269588-070-0805ND
2017-07-039588-043-0840ND
2017-07-039588-063-0715ND
2017-07-039588-064-0750ND
2017-07-039588-070-1130ND
2017-07-109588-070-1245ND
2017-07-113761-065-1217ND
2017-07-113761-068-1200ND
2017-07-123761-026-1025ND
2017-07-179588-070-1105ND
2017-07-249588-070-1215ND
2017-07-319588-070-0810ND
2017-08-079588-043-0855ND
2017-08-079588-063-0810ND
2017-08-079588-064-0845ND
2017-08-079588-070-1230ND
2017-08-149588-070-1340ND
2017-08-219588-070-1110ND
2017-08-229588-077-0925ND
2017-08-289588-070-1030ND
2017-09-059588-043-0955ND
2017-09-059588-063-0840ND
2017-09-059588-064-0935ND
2017-09-119588-070-1400ND
2017-09-149588-031-1320ND
2017-09-149588-044-1420ND
2017-09-149588-045-1340ND
2017-09-189588-077-0940ND
2017-09-279588-077-0910ND
2017-10-023761-026-0840ND
2017-10-029588-043-0930ND
2017-10-029588-063-0855ND
2017-10-029588-064-0920ND
2017-10-023761-065-1005ND
2017-10-023761-068-0955ND
2017-10-059588-077-0817ND
2017-10-169588-077-1138ND
2017-10-279588-077-0745ND
2017-11-069588-043-0815ND
2017-11-069588-063-0740ND
2017-11-069588-064-0805ND
2017-11-209588-070-1115ND
2017-11-279588-070-0955ND
2017-12-049588-043-0830ND
2017-12-049588-063-0800ND
2017-12-049588-064-0825ND
2017-12-183761-034-0930ND
2017-12-279588-070-0955ND
2018-01-029588-043-0845ND
2018-01-029588-063-0800ND
2018-01-029588-064-0835ND
2018-01-029588-070-1120ND
2018-01-043761-006-1125ND
2018-01-043761-007-1140ND
2018-01-043761-020-1110ND
2018-01-043761-027-1055ND
2018-01-083761-026-10201.40 ppb
2018-01-083761-034-1010ND
2018-01-083761-043-0820ND
2018-01-083761-063-1000ND
2018-01-083761-064-0830ND
2018-01-083761-065-1135ND
2018-01-083761-068-1135ND
2018-01-083761-072-1020ND
2018-01-113761-001-1130ND
2018-01-113761-022-1115ND
2018-01-113761-023-1150ND
2018-01-113761-076-1225ND
2018-01-113761-805-0930ND
2018-01-199588-076-0800ND
2018-01-303761-028-1000ND
2018-02-059588-043-0810ND
2018-02-059588-063-0740ND
2018-02-059588-064-0805ND
2018-03-059588-043-0805ND
2018-03-059588-064-0755ND
2018-03-129588-023-0940ND
2018-03-159588-006-1110ND
2018-03-159588-007-0810ND
2018-03-159588-020-0730ND
2018-03-269588-043-0950ND
2018-03-279588-070-1255ND
2018-04-029588-043-0745ND
2018-04-029588-064-0743ND
2018-04-123761-026-0825ND
2018-04-239588-070-1033ND
2018-04-243761-026-09251.60 ppb
2018-04-243761-044-1037ND
2018-04-243761-065-10202.00 ppb
2018-04-243761-068-10152.00 ppb
2018-04-249588-077-0835ND
2018-04-243761-805-10303.00 ppb
2018-05-079588-043-0750ND
2018-05-079588-064-0744ND
2018-05-079588-077-1039ND
2018-05-153761-026-1100ND
2018-05-219588-063-0840ND
2018-06-049588-043-0705ND
2018-06-049588-063-0835ND
2018-06-049588-064-0710ND
2018-06-119588-034-1030ND
2018-06-119588-068-0947ND
2018-06-119588-072-1020ND
2018-06-119588-077-1200ND
2018-06-259588-065-0900ND
2018-07-029588-043-0820ND
2018-07-029588-063-0800ND
2018-07-029588-064-0817ND
2018-07-053761-026-0840ND
2018-07-059588-028-0750ND
2018-07-059588-077-1050ND
2018-07-093761-034-1015ND
2018-07-093761-044-0940ND
2018-07-093761-065-0950ND
2018-07-093761-068-1000ND
2018-07-099588-070-1120ND
2018-07-099588-077-1150ND
2018-07-169588-077-1020ND
2018-07-179588-070-0900ND
2018-07-239588-070-1155ND
2018-07-239588-077-1015ND
2018-07-309588-031-0800ND
2018-07-309588-045-0730ND
2018-07-309588-077-0912ND
2018-08-069588-043-0920ND
2018-08-069588-063-1010ND
2018-08-069588-064-0915ND
2018-08-069588-070-1140ND
2018-08-069588-077-1043ND
2018-08-133761-065-1010ND
2018-08-133761-068-1130ND
2018-08-139588-077-0900ND
2018-08-209588-077-0800ND
2018-08-279588-077-1025ND
2018-09-049588-043-0850ND
2018-09-049588-063-0810ND
2018-09-049588-064-0840ND
2018-09-049588-077-1210ND
2018-09-079588-070-1330ND
2018-09-109588-070-0715ND
2018-09-179588-070-0735ND
2018-09-249588-070-1055ND
2018-09-249588-083-1125ND
2018-10-019588-043-0940ND
2018-10-019588-063-0910ND
2018-10-019588-064-0935ND
2018-10-019588-070-1200ND
2018-10-033761-065-1015ND
2018-10-043761-026-0840ND
2018-10-053761-068-1040ND
2018-10-099588-070-1000ND
2018-10-189588-077-1310ND
2018-10-229588-077-0815ND
2018-10-299588-077-0815ND
2018-11-059588-043-0750ND
2018-11-059588-063-0930ND
2018-11-059588-064-0740ND
2018-11-059588-077-1005ND
2018-11-083761-065-1000ND
2018-11-089588-083-1100ND
2018-11-139588-077-1013ND
2018-11-199588-077-1025ND
2018-11-269588-077-1050ND
2018-12-039588-043-0830ND
2018-12-039588-063-0800ND
2018-12-039588-064-0820ND
2018-12-109588-083-1042ND
2018-12-173761-044-1315ND
2019-01-029588-043-0755ND
2019-01-029588-063-0735ND
2019-01-029588-064-0750ND
2019-01-029588-076-1000ND
2019-01-033761-043-0805ND
2019-01-043761-007-0740ND
2019-01-043761-020-0720ND
2019-01-043761-022-0840ND
2019-01-043761-023-0915ND
2019-01-043761-027-0815ND
2019-01-043761-028-0900ND
2019-01-043761-063-1100ND
2019-01-043761-064-1050ND
2019-01-073761-026-0740ND
2019-01-083761-034-0810ND
2019-01-083761-072-0800ND
2019-01-223761-065-0930ND
2019-01-243761-006-0945ND
2019-01-243761-044-1125ND
2019-01-243761-045-1412ND
2019-02-049588-043-0635ND
2019-02-049588-063-0800ND
2019-02-049588-064-0640ND
2019-02-073761-068-1400ND
2019-02-119588-077-1135ND
2019-02-139588-070-1255ND
2019-04-049588-070-0720ND
2019-04-073761-065-1030ND
2019-04-073761-068-0930ND
2019-04-089588-077-1015ND
2019-04-093761-026-0935ND
2019-04-119588-083-1000ND
2019-04-169588-070-0817ND
2019-05-089588-077-1031ND
2019-05-159588-077-1012ND
2019-05-249588-063-1110ND
2019-05-249588-064-1100ND
2019-06-039588-063-1010ND
2019-06-039588-064-0805ND
2019-06-139588-070-1147ND
2019-06-139588-083-1105ND
2019-06-179588-064-0915ND
2019-07-019588-043-0805ND
2019-07-019588-063-0730ND
2019-07-019588-064-0750ND
2019-07-039588-070-0725ND
2019-07-083761-026-1310ND
2019-07-089588-070-1155ND
2019-07-119588-043-0810ND
2019-07-153761-065-0750ND
2019-07-153761-068-0740ND
2019-07-179588-070-0855ND
2019-07-229588-070-0912ND
2019-07-299588-070-1035ND
2019-07-319588-083-0850ND
2019-08-059588-043-0725ND
2019-08-059588-063-0645ND
2019-08-059588-064-0715ND
2019-08-059588-070-1045ND
2019-08-059588-083-1000ND
2019-08-129588-070-1100ND
2019-08-129588-083-1020ND
2019-08-199588-070-1020ND
2019-08-279588-070-0905ND
2019-09-049588-043-0720ND
2019-09-049588-063-0800ND
2019-09-049588-064-0705ND
2019-09-049588-070-1043ND
2019-09-049588-083-1015ND
2019-09-099588-083-1040ND
2019-09-169588-083-0930ND
2019-09-239588-083-0950ND
2019-09-259588-070-0840ND
2019-09-309588-070-1105ND
2019-10-079588-043-0750ND
2019-10-079588-063-0720ND
2019-10-079588-064-0740ND
2019-10-079588-070-1230ND
2019-10-079588-083-1200ND
2019-10-083761-026-1025ND
2019-10-083761-065-1100ND
2019-10-083761-068-1145ND
2019-10-159588-070-1105ND
2019-10-219588-070-1107ND
2019-10-219588-083-1035ND
2019-10-283761-044-0920ND
2019-10-289588-083-1140ND
2019-11-049588-043-0915ND
2019-11-049588-063-0845ND
2019-11-049588-064-0905ND
2019-11-069588-083-0927ND
2019-11-129588-083-1100ND
2019-11-189588-083-1010ND
2019-11-253761-031-0920ND
2019-12-029588-043-0820ND
2019-12-029588-063-0740ND
2019-12-029588-064-0810ND