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EWG's Tap Water Database — 2021 UPDATE

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Atrazine

City of Clovis

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

 

110

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND110ND
2015ND110ND
2016ND250ND
2017ND220ND
2018ND170ND
2019ND240ND

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
2014-06-125810-052-1010ND
2014-06-135810-054-1057ND
2014-09-045810-048-1210ND
2014-09-085810-033-0840ND
2014-09-085810-034-0930ND
2014-09-125810-005-0949ND
2014-09-125810-019-0851ND
2014-09-155810-018-0822ND
2014-09-185810-024-1050ND
2014-09-185810-026-0954ND
2014-09-195810-025-1036ND
2015-03-185810-046-0928ND
2015-06-165810-049-1050ND
2015-09-115810-070-1045ND
2015-09-155810-077-0851ND
2015-09-165810-074-0915ND
2015-09-215810-072-0945ND
2015-09-235810-068-0947ND
2015-12-105810-074-0839ND
2015-12-115810-072-0930ND
2015-12-115810-077-1117ND
2015-12-165810-070-0917ND
2016-01-215810-068-1120ND
2016-06-085810-014-0752ND
2016-06-085810-082-0924ND
2016-06-135810-031-1020ND
2016-06-135810-032-1100ND
2016-06-175810-035-1023ND
2016-06-175810-050-1101ND
2016-06-205810-036-1109ND
2016-06-225810-012-0920ND
2016-06-225810-020-0738ND
2016-06-225810-040-0933ND
2016-06-225810-076-0750ND
2016-06-245810-016-0922ND
2016-09-085810-014-0800ND
2016-09-085810-040-0900ND
2016-09-095810-012-0950ND
2016-09-095810-031-0847ND
2016-09-095810-032-0815ND
2016-09-095810-035-1038ND
2016-09-095810-036-1126ND
2016-09-095810-076-0925ND
2016-09-095810-082-0845ND
2016-09-125810-050-0955ND
2016-09-145810-016-0923ND
2016-09-145810-020-0805ND
2017-06-025810-024-0906ND
2017-06-025810-026-0841ND
2017-06-065810-048-0845ND
2017-06-065810-052-0815ND
2017-06-075810-019-1020ND
2017-06-075810-033-0814ND
2017-06-075810-034-0800ND
2017-06-085810-005-0745ND
2017-06-085810-018-0805ND
2017-06-085810-054-0839ND
2017-07-285810-025-1120ND
2017-09-085810-054-0725ND
2017-09-115810-005-0714ND
2017-09-125810-033-0745ND
2017-09-125810-034-0810ND
2017-09-125810-048-0950ND
2017-09-135810-018-1030ND
2017-09-145810-019-0740ND
2017-09-145810-024-1225ND
2017-09-185810-052-0815ND
2017-09-205810-025-1330ND
2017-09-205810-026-1250ND
2018-03-055810-046-0831ND
2018-06-045810-046-1102ND
2018-06-065810-049-0705ND
2018-09-065810-049-0849ND
2018-09-065810-068-0737ND
2018-09-065810-070-0743ND
2018-09-065810-074-0856ND
2018-09-075810-046-0800ND
2018-09-115810-077-1046ND
2018-09-195810-072-1026ND
2018-10-175810-070-0801ND
2018-10-175810-074-0819ND
2018-10-175810-077-1027ND
2018-10-185810-049-0915ND
2018-10-185810-068-0830ND
2018-10-185810-072-1028ND
2018-10-225810-046-0845ND
2019-04-045810-082-0920ND
2019-04-055810-032-0845ND
2019-04-055810-036-0640ND
2019-04-055810-040-0955ND
2019-04-085810-020-0905ND
2019-04-115810-035-0832ND
2019-04-115810-050-0802ND
2019-04-245810-031-0935ND
2019-04-245810-076-0830ND
2019-04-295810-016-0918ND
2019-05-215810-014-0750ND
2019-06-145810-012-0632ND
2019-07-035810-040-1005ND
2019-07-055810-014-0814ND
2019-07-055810-035-0733ND
2019-07-055810-050-0653ND
2019-07-095810-016-0951ND
2019-07-095810-076-0700ND
2019-07-105810-012-0724ND
2019-07-105810-031-0655ND
2019-07-165810-032-0925ND
2019-07-175810-082-0730ND
2019-07-185810-036-0820ND
2019-07-265810-020-0832ND