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EWG's Tap Water Database — 2019 UPDATE

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Atrazine

California Water Service (CWS) - Salinas

Atrazine is a herbicide commonly detected in drinking water that comes from cornfield and other agricultural runoff. It is a hormone disrupter that harms the male and female reproductive systems of people and wildlife. Read More.

Federal laws allow up to 3 parts per billion of atrazine in treated tap water. Water suppliers average atrazine measurements collected over a year, which means that the reported values underestimate intense spikes of elevated exposures during the periods in late spring and early summer when atrazine is applied in large amounts on farm fields.

Human epidemiological studies suggest that federal standards for atrazine are insufficient to protect public health. In 1999 the California Office of Environmental Health Hazard Assessment set a public health goal of 0.15 parts per billion for atrazine in drinking water, based on a study finding increased rates of breast cancer in rats exposed to the chemical. California’s legal maximum for atrazine in tap water is 1 ppb.

Click here to read more about atrazine.

 

133

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND190ND
2013ND660ND
2014ND130ND
2015ND80ND
2016ND220ND
2017ND50ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for atrazine was defined by EWG based on epidemiological studies of human exposure to atrazine in drinking water.. This health guideline protects against harm to the developing fetus, harm to the reproductive system and hormone disruption.

EPA Maximum Contaminant
Level (MCL) 3 ppb

The legal limit for atrazine, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s. This limit does not fully protect against harm to the reproductive system, harm to the developing fetus, and hormone disruption.

ppb = parts per billion

All test results

Date Lab ID Result
2012-02-019590-103-1120ND
2012-02-019590-106-1001ND
2012-02-019590-123-1326ND
2012-02-029590-102-1144ND
2012-03-089590-046-1102ND
2012-05-039590-106-1154ND
2012-05-109590-103-1104ND
2012-05-179590-104-1354ND
2012-05-229590-102-1120ND
2012-05-229590-123-1204ND
2012-08-169590-102-0944ND
2012-08-239590-123-1145ND
2012-08-309590-106-1311ND
2012-11-149590-102-1121ND
2012-11-149590-103-0951ND
2012-11-159590-106-1306ND
2012-11-199590-123-1024ND
2012-12-039590-103-1320ND
2012-12-049590-103-1112ND
2013-01-109590-005-1105ND
2013-01-109590-008-1010ND
2013-01-109590-009-1428ND
2013-01-309590-010-1126ND
2013-02-219590-102-1009ND
2013-02-269590-018-1051ND
2013-02-269590-019-1438ND
2013-02-279590-106-1256ND
2013-02-279590-123-1147ND
2013-02-289590-015-1130ND
2013-03-059590-014-1150ND
2013-03-059590-022-1436ND
2013-03-059590-024-1509ND
2013-03-059590-026-1333ND
2013-03-079590-017-1015ND
2013-03-079590-023-1338ND
2013-03-079590-027-1038ND
2013-03-199590-103-1401ND
2013-03-219590-020-1040ND
2013-03-279590-006-1410ND
2013-04-049590-028-1339ND
2013-04-049590-030-0957ND
2013-04-049590-037-1023ND
2013-04-119590-043-1431ND
2013-04-129590-041-1200ND
2013-04-189590-046-1007ND
2013-04-309590-029-1434ND
2013-05-029590-106-1021ND
2013-05-039590-104-1531ND
2013-05-099590-102-1257ND
2013-05-149590-103-1311ND
2013-05-149590-123-1603ND
2013-07-089590-005-1355ND
2013-07-109590-008-1456ND
2013-07-109590-009-1100ND
2013-07-179590-006-1353ND
2013-07-179590-010-1136ND
2013-08-079590-106-1217ND
2013-08-079590-123-1026ND
2013-08-089590-019-1201ND
2013-08-089590-102-1306ND
2013-08-089590-103-1023ND
2013-08-169590-020-1558ND
2013-08-209590-104-1056ND
2013-08-229590-014-1030ND
2013-08-229590-017-1309ND
2013-08-229590-046-1024ND
2013-08-279590-015-1245ND
2013-08-279590-018-1307ND
2013-09-119590-026-1502ND
2013-09-139590-022-1317ND
2013-09-189590-024-1455ND
2013-09-189590-027-1012ND
2013-09-209590-023-1559ND
2013-10-119590-030-1301ND
2013-10-179590-029-1144ND
2013-10-229590-028-1128ND
2013-10-229590-043-1422ND
2013-10-239590-037-1127ND
2013-10-239590-041-1113ND
2013-10-299590-039-1408ND
2013-11-069590-106-1544ND
2013-11-079590-102-1308ND
2013-11-079590-103-1341ND
2013-11-149590-123-1338ND
2013-12-189590-131-1116ND
2014-02-129590-102-1321ND
2014-02-129590-103-1352ND
2014-02-129590-123-0936ND
2014-02-199590-106-1143ND
2014-05-079590-102-1427ND
2014-05-079590-103-1448ND
2014-05-139590-123-1033ND
2014-08-049590-102-0912ND
2014-08-049590-103-1409ND
2014-08-049590-123-0940ND
2014-11-129590-102-1030ND
2014-11-129590-103-0949ND
2014-11-129590-123-1409ND
2015-02-079590-103-1044ND
2015-02-079590-123-1140ND
2015-03-109590-102-1500ND
2015-03-109590-123-1420ND
2015-04-219590-008-1356ND
2015-05-149590-102-1556ND
2015-05-149590-103-1504ND
2015-05-149590-123-1437ND
2016-01-079590-009-1048ND
2016-01-079590-020-1009ND
2016-01-209590-018-1244ND
2016-02-049590-027-0946ND
2016-02-099590-104-1214ND
2016-02-109590-006-1204ND
2016-02-229590-024-1519ND
2016-03-019590-037-1248ND
2016-03-039590-015-1426ND
2016-04-059590-022-1344ND
2016-04-279590-041-1039ND
2016-05-039590-026-1258ND
2016-05-049590-017-1424ND
2016-06-289590-023-1352ND
2016-08-029590-019-1102ND
2016-09-149590-106-0909ND
2016-09-209590-046-1102ND
2016-10-059590-029-1003ND
2016-10-059590-030-0904ND
2016-12-079590-043-1444ND
2016-12-299590-008-1413ND
2016-12-299590-104-0951ND
2017-01-199590-014-1048ND
2017-03-029590-132-1100ND
2017-04-059590-005-1428ND
2017-11-219590-131-1240ND
2017-12-149590-132-1456ND