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EWG's Tap Water Database — 2021 UPDATE

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Atrazine

Rancho California Water District

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.

MORE ABOUT THIS CONTAMINANT

 

148

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND210ND
2015ND360ND
2016ND220ND
2017ND210ND
2018ND300ND
2019ND180ND

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
2014-01-294790-036-1030ND
2014-02-074790-143-0924ND
2014-04-024790-084-1000ND
2014-04-034790-043-1015ND
2014-05-084790-143-1015ND
2014-06-034790-012-0850ND
2014-07-034790-084-1040ND
2014-07-084790-034-1015ND
2014-07-084790-043-1130ND
2014-08-064790-143-0905ND
2014-08-074790-048-1130ND
2014-09-034790-012-0852ND
2014-09-034790-038-1235ND
2014-09-044790-024-0855ND
2014-09-044790-059-0935ND
2014-09-174790-029-1108ND
2014-10-024790-034-1015ND
2014-12-104790-042-1111ND
2014-12-114790-024-0820ND
2014-12-164790-038-0810ND
2014-12-184790-029-0939ND
2015-01-074790-097-1215ND
2015-01-274790-047-0930ND
2015-01-294790-142-1030ND
2015-02-104790-143-0905ND
2015-03-044790-042-1127ND
2015-03-054790-028-0932ND
2015-04-084790-047-0957ND
2015-04-094790-041-1020ND
2015-04-164790-097-0915ND
2015-04-214790-085-1100ND
2015-04-214790-086-1120ND
2015-04-214790-090-1040ND
2015-04-224790-053-1200ND
2015-04-224790-142-1015ND
2015-05-144790-015-1025ND
2015-05-144790-095-1505ND
2015-05-144790-143-1505ND
2015-06-024790-028-1050ND
2015-06-174790-065-0945ND
2015-07-024790-041-1050ND
2015-07-074790-027-0915ND
2015-07-144790-142-1020ND
2015-07-154790-085-1106ND
2015-07-154790-086-1130ND
2015-07-154790-090-1050ND
2015-07-164790-053-1200ND
2015-08-054790-143-1455ND
2015-08-064790-019-1210ND
2015-09-024790-045-0000ND
2015-09-034790-065-1025ND
2015-10-084790-027-0915ND
2015-10-144790-142-1045ND
2015-10-224790-044-0830ND
2015-11-304790-143-1325ND
2015-12-024790-045-1042ND
2015-12-094790-046-0925ND
2016-01-134790-044-0900ND
2016-01-204790-142-1030ND
2016-02-294790-150-1830ND
2016-03-024790-071-1035ND
2016-03-154790-046-1300ND
2016-04-144790-142-1100ND
2016-06-094790-018-1020ND
2016-07-124790-040-0915ND
2016-07-194790-031-0830ND
2016-07-204790-017-0900ND
2016-07-254790-036-1015ND
2016-08-034790-025-1040ND
2016-08-034790-035-1205ND
2016-08-094790-142-1245ND
2016-09-074790-018-1125ND
2016-10-034790-031-1010ND
2016-10-044790-040-1100ND
2016-10-114790-015-0935ND
2016-10-114790-051-1030ND
2016-10-124790-037-1046ND
2016-10-184790-036-1100ND
2016-11-295810-153-1055ND
2017-01-175810-037-0920ND
2017-02-039588-153-1050ND
2017-03-234790-142-1020ND
2017-04-114790-043-1020ND
2017-04-114790-084-0940ND
2017-04-124790-142-1030ND
2017-05-044790-153-1010ND
2017-07-064790-034-1012ND
2017-07-134790-142-1035ND
2017-08-094790-095-1000ND
2017-08-104790-153-1215ND
2017-08-164790-048-1010ND
2017-09-014790-150-0925ND
2017-09-144790-029-0932ND
2017-09-144790-038-1111ND
2017-09-214790-024-1050ND
2017-09-284790-059-0943ND
2017-11-084790-150-1445ND
2017-11-224790-151-1100ND
2017-11-294790-012-0935ND
2017-12-064790-042-0912ND
2018-01-044790-097-1134ND
2018-01-044790-142-1242ND
2018-02-079588-150-1251ND
2018-02-079588-151-1127ND
2018-04-114790-041-0855ND
2018-04-124790-086-1115ND
2018-04-124790-090-1050ND
2018-04-274790-053-1156ND
2018-05-034790-150-1130ND
2018-05-034790-151-1235ND
2018-05-084790-015-1006ND
2018-05-224790-152-1051ND
2018-05-234790-047-1004ND
2018-06-074790-065-1015ND
2018-07-114790-027-0915ND
2018-07-174790-152-1045ND
2018-08-084790-085-0945ND
2018-08-094790-151-1000ND
2018-08-144790-150-0914ND
2018-08-224790-151-1007ND
2018-10-034790-152-1030ND
2018-10-094790-044-1135ND
2018-10-164790-045-1245ND
2018-10-174790-155-1240ND
2018-11-064790-150-0957ND
2018-11-064790-151-1116ND
2018-11-274790-143-1005ND
2018-11-274790-150-1113ND
2018-11-274790-151-1222ND
2018-12-174790-046-1210ND
2019-01-094790-152-1100ND
2019-01-094790-155-0930ND
2019-02-124790-153-1201ND
2019-02-194790-150-1022ND
2019-02-194790-151-0900ND
2019-03-124790-071-1030ND
2019-04-024790-155-1115ND
2019-06-044790-018-1030ND
2019-07-014790-031-1052ND
2019-07-114790-017-1045ND
2019-07-224790-036-0958ND
2019-07-224790-040-0930ND
2019-07-224790-155-0820ND
2019-07-254790-155-0945ND
2019-09-104790-025-0945ND
2019-09-104790-035-0915ND
2019-10-089588-051-1045ND
2019-10-154790-037-1024ND