Know Your Environment. Protect Your Health.

Atrazine

Triple R Mutual Water Company

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.

 

47

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019ND100ND
2020ND40ND
2021ND250ND
2022ND80ND
2023N/A00N/A

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2019-12-11CA5400670_010_010-201912111225ND
2019-12-11CA5400670_002_002-201912111155ND
2019-12-11CA5400670_001_001-201912111030ND
2019-12-11CA5400670_008_008-201912111255ND
2019-12-11CA5400670_006_006-201912111100ND
2019-12-11CA5400670_007_007-201912111240ND
2019-12-11CA5400670_005_005-201912111140ND
2019-12-11CA5400670_011_011-201912111210ND
2019-12-11CA5400670_009_009-201912111115ND
2019-12-11CA5400670_004_004-201912110955ND
2020-03-22CA5400670_011_011-202003221250ND
2020-06-29CA5400670_011_011-202006291640ND
2020-09-28CA5400670_011_011-202009281620ND
2020-12-20CA5400670_011_011-202012201140ND
2021-03-31CA5400670_011_011-202103311200ND
2021-06-24CA5400670_006_006-202106240835ND
2021-06-24CA5400670_005_005-202106240850ND
2021-06-24CA5400670_002_002-202106241030ND
2021-06-24CA5400670_008_008-202106241010ND
2021-06-24CA5400670_007_007-202106240950ND
2021-06-24CA5400670_001_001-202106240820ND
2021-06-24CA5400670_004_004-202106240800ND
2021-06-24CA5400670_009_009-202106240920ND
2021-09-27CA5400670_005_005-202109271645ND
2021-09-27CA5400670_001_001-202109271600ND
2021-09-27CA5400670_009_009-202109271700ND
2021-09-27CA5400670_008_008-202109271830ND
2021-09-27CA5400670_006_006-202109271740ND
2021-09-27CA5400670_004_004-202109271630ND
2021-09-27CA5400670_007_007-202109271800ND
2021-09-27CA5400670_002_002-202109271615ND
2021-12-21CA5400670_008_008-202112211257ND
2021-12-21CA5400670_005_005-202112211335ND
2021-12-21CA5400670_007_007-202112211240ND
2021-12-21CA5400670_004_004-202112211410ND
2021-12-21CA5400670_006_006-202112211340ND
2021-12-21CA5400670_001_001-202112211400ND
2021-12-21CA5400670_002_002-202112211315ND
2021-12-21CA5400670_009_009-202112211325ND
2022-03-27CA5400670_001_001-202203271400ND
2022-03-27CA5400670_006_006-202203271420ND
2022-03-27CA5400670_005_005-202203271645ND
2022-03-27CA5400670_007_007-202203271700ND
2022-03-27CA5400670_002_002-202203271630ND
2022-03-27CA5400670_009_009-202203271435ND
2022-03-27CA5400670_008_008-202203271720ND
2022-03-27CA5400670_004_004-202203271800ND