Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Atrazine

Ayersville Water and Sewer District

NOTE: Ayersville Water and Sewer District purchases water from Defiance City which is required to test for atrazine. Sample information shown below was taken by Defiance City.

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

15

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.272 ppb63ND - 0.680 ppb
20130.392 ppb660.120 ppb - 0.800 ppb
20140.0313 ppb31ND - 0.0940 ppb
20150.106 ppb330.0780 ppb - 0.120 ppb
20160.150 ppb330.110 ppb - 0.220 ppb
20170.0533 ppb31ND - 0.160 ppb

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

NOTE: Ayersville Water and Sewer District purchases water from Defiance City which is required to test for atrazine. Sample information shown below was taken by Defiance City.

Date Lab ID Result
2012-01-1012-10448-05CND
2012-04-1012-13996-06ND
2012-04-1012-13996-07ND
2012-06-1212-16821-010.500 ppb
2012-07-1012-18181-030.680 ppb
2012-10-0912-22945-030.450 ppb
2013-01-0813-10383-03C0.690 ppb
2013-04-0913-14336-030.180 ppb
2013-05-1413-15935-040.120 ppb
2013-06-1813-17766-020.250 ppb
2013-07-0913-18860-140.800 ppb
2013-10-0813-23673-020.310 ppb
2014-04-0814-14258-01ND
2014-05-1314-15844-03ND
2014-06-1014-17413-010.0940 ppb
2015-04-1015-14528-010.120 ppb
2015-05-0815-15965-030.0780 ppb
2015-06-1215-18049-01B0.120 ppb
2016-04-1116-15196-010.110 ppb
2016-05-1316-17012-010.120 ppb
2016-06-1016-18686-010.220 ppb
2017-04-1017-16174-04ND
2017-05-1217-18378-03ND
2017-06-0917-20363-020.160 ppb