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EWG's Tap Water Database — 2019 UPDATE

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Perchlorate

Suburban Water Systems-covina Knolls

NOTE: Suburban Water Systems-covina Knolls purchases water from Covina Irrigating Company which is required to test for perchlorate. Sample information shown below was taken by Covina Irrigating 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.

 

200

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND490ND
2013ND570ND
2014ND540ND
2015ND380ND
20162.00 ppb21ND - 4.00 ppb
2017N/A00N/A

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

NOTE: Suburban Water Systems-covina Knolls purchases water from Covina Irrigating Company which is required to test for perchlorate. Sample information shown below was taken by Covina Irrigating Company.

Date Lab ID Result
2012-01-249588-001-0800ND
2012-01-249588-002-0815ND
2012-01-249588-003-1015ND
2012-01-249588-008-0800ND
2012-01-259588-002-1025ND
2012-01-259588-003-1030ND
2012-03-289588-001-1110ND
2012-03-289588-003-1100ND
2012-03-289588-008-1110ND
2012-04-239588-001-1000ND
2012-04-239588-002-1015ND
2012-04-239588-003-1100ND
2012-04-239588-008-1000ND
2012-04-269588-002-1010ND
2012-04-269588-003-1020ND
2012-05-079588-008-0956ND
2012-05-149588-001-0940ND
2012-05-149588-002-0950ND
2012-05-149588-003-1000ND
2012-05-149588-008-0940ND
2012-06-049588-001-0939ND
2012-06-049588-002-0943ND
2012-06-049588-003-0956ND
2012-06-049588-008-0952ND
2012-07-029588-001-1056ND
2012-07-029588-002-1048ND
2012-07-029588-003-1052ND
2012-07-029588-008-1045ND
2012-07-259588-001-1035ND
2012-07-259588-002-1045ND
2012-07-259588-003-1055ND
2012-08-069588-001-0950ND
2012-08-069588-002-1005ND
2012-08-069588-003-1010ND
2012-08-069588-008-0950ND
2012-09-049588-001-1030ND
2012-09-049588-002-1040ND
2012-09-049588-003-1045ND
2012-09-049588-008-1030ND
2012-10-019588-001-1115ND
2012-10-019588-002-1025ND
2012-10-019588-003-1035ND
2012-10-019588-008-1020ND
2012-10-249588-002-1055ND
2012-10-249588-003-1110ND
2012-11-059588-001-1232ND
2012-11-059588-002-1229ND
2012-11-059588-003-1226ND
2012-11-059588-008-1223ND
2013-01-219588-001-1120ND
2013-01-219588-002-1130ND
2013-01-219588-003-1140ND
2013-01-219588-008-1120ND
2013-01-259588-002-0950ND
2013-01-259588-003-1000ND
2013-02-219588-001-1030ND
2013-02-219588-002-1040ND
2013-02-219588-003-1045ND
2013-02-219588-008-1030ND
2013-03-049588-001-1010ND
2013-03-049588-008-1010ND
2013-03-059588-002-1055ND
2013-03-059588-003-1050ND
2013-04-169588-001-1010ND
2013-04-169588-002-1017ND
2013-04-169588-003-1025ND
2013-04-169588-008-1010ND
2013-04-259588-002-1540ND
2013-04-259588-003-1550ND
2013-05-139588-001-1000ND
2013-05-139588-002-1015ND
2013-05-139588-003-1025ND
2013-05-139588-008-1005ND
2013-06-039588-001-1024ND
2013-06-039588-002-1028ND
2013-06-039588-003-1033ND
2013-06-039588-008-1031ND
2013-07-089588-001-1000ND
2013-07-089588-002-1010ND
2013-07-089588-003-1020ND
2013-07-089588-008-1005ND
2013-07-259588-001-1025ND
2013-07-259588-002-1030ND
2013-07-259588-003-1035ND
2013-08-059588-001-1030ND
2013-08-059588-002-1055ND
2013-08-059588-003-1045ND
2013-08-059588-008-1035ND
2013-09-039588-001-1023ND
2013-09-039588-002-1030ND
2013-09-039588-003-1035ND
2013-09-039588-008-1042ND
2013-10-019588-001-1035ND
2013-10-019588-002-1045ND
2013-10-019588-003-1050ND
2013-10-019588-008-1040ND
2013-10-249588-002-1035ND
2013-10-249588-003-1040ND
2013-11-119588-001-0930ND
2013-11-119588-002-0940ND
2013-11-119588-003-0950ND
2013-11-119588-008-0930ND
2013-12-039588-001-1035ND
2013-12-039588-002-1041ND
2013-12-039588-003-1045ND
2013-12-039588-008-1035ND
2014-01-069588-001-0940ND
2014-01-069588-002-0955ND
2014-01-069588-003-1010ND
2014-01-069588-008-0940ND
2014-01-279588-002-0850ND
2014-01-279588-003-0900ND
2014-02-039588-001-1000ND
2014-02-039588-002-1010ND
2014-02-039588-003-1020ND
2014-02-039588-008-1000ND
2014-03-039588-001-1010ND
2014-03-039588-002-1020ND
2014-03-039588-003-1028ND
2014-03-039588-008-1010ND
2014-04-019588-001-0900ND
2014-04-019588-002-0910ND
2014-04-019588-003-0920ND
2014-04-019588-008-0900ND
2014-04-259588-002-1040ND
2014-04-259588-003-1045ND
2014-05-069588-001-0955ND
2014-05-069588-002-1005ND
2014-05-069588-003-1010ND
2014-05-069588-008-0955ND
2014-06-029588-001-1010ND
2014-06-029588-002-1025ND
2014-06-029588-003-1035ND
2014-06-029588-008-1010ND
2014-07-019588-001-1020ND
2014-07-019588-002-1030ND
2014-07-019588-003-1040ND
2014-07-019588-008-1020ND
2014-07-259588-001-1100ND
2014-07-259588-002-1105ND
2014-07-259588-003-1110ND
2014-08-059588-001-1035ND
2014-08-059588-002-1040ND
2014-08-059588-003-1050ND
2014-08-059588-008-1035ND
2014-09-029588-001-0935ND
2014-09-029588-002-0945ND
2014-09-029588-003-0950ND
2014-09-029588-008-0935ND
2014-10-069588-002-1224ND
2014-10-069588-003-1230ND
2014-10-069588-008-1202ND
2014-10-249588-002-1005ND
2014-10-249588-003-1015ND
2014-11-039588-002-1052ND
2014-11-039588-003-1105ND
2014-11-039588-008-1047ND
2014-12-029588-002-1047ND
2014-12-029588-003-1100ND
2014-12-029588-008-1108ND
2015-01-209588-002-1020ND
2015-01-209588-003-1030ND
2015-01-209588-008-1015ND
2015-01-269588-002-1000ND
2015-01-269588-003-1010ND
2015-02-029588-002-1035ND
2015-02-029588-003-1040ND
2015-02-029588-008-1030ND
2015-03-099588-002-1024ND
2015-03-099588-003-1030ND
2015-03-099588-008-1015ND
2015-04-069588-002-1138ND
2015-04-069588-003-1145ND
2015-04-069588-008-1122ND
2015-04-249588-002-1000ND
2015-04-249588-003-1010ND
2015-05-049588-002-0947ND
2015-05-049588-003-0952ND
2015-05-049588-008-0938ND
2015-06-019588-002-1103ND
2015-06-019588-003-1109ND
2015-06-019588-008-1056ND
2015-07-079588-002-1055ND
2015-07-079588-003-1105ND
2015-07-079588-008-1045ND
2015-07-249588-002-1015ND
2015-07-249588-003-1025ND
2015-08-039588-002-0955ND
2015-08-039588-003-1000ND
2015-08-039588-008-0945ND
2015-09-019588-002-1040ND
2015-09-019588-003-1050ND
2015-09-019588-008-1035ND
2015-11-029588-002-1033ND
2015-11-029588-008-1020ND
2015-11-109588-002-0900ND
2015-12-019588-002-1041ND
2015-12-019588-008-1034ND
2016-01-049588-002-1015ND
2016-01-049588-008-10104.00 ppb