Know Your Environment. Protect Your Health.

Atrazine

Terra Bella Irrigation District - Tbt

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.

 

37

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND90ND
2019ND90ND
2020ND30ND
2021ND110ND
2022ND30ND
2023ND20ND

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
2018-09-24CA5410038_016_016-201809241335ND
2018-09-24CA5410038_020_020-201809241342ND
2018-09-24CA5410038_002_002-201809241345ND
2018-09-24CA5410038_024_024-201809241415ND
2018-09-24CA5410038_027_027-201809241445ND
2018-09-24CA5410038_032_032-201809241300ND
2018-09-24CA5410038_009_009-201809241354ND
2018-12-27CA5410038_027_027-201812271250ND
2018-12-27CA5410038_032_032-201812271200ND
2019-02-26CA5410038_032_032-201902261152ND
2019-02-26CA5410038_027_027-201902261318ND
2019-05-10CA5410038_027_027-201905101310ND
2019-05-10CA5410038_032_032-201905101155ND
2019-08-29CA5410038_027_027-201908291340ND
2019-08-29CA5410038_025_025-201908291300ND
2019-08-29CA5410038_032_032-201908291208ND
2019-11-21CA5410038_032_032-201911211158ND
2019-11-21CA5410038_027_027-201911211338ND
2020-08-27CA5410038_001_001-202008271300ND
2020-08-31CA5410038_009_009-202008311210ND
2020-12-29CA5410038_028_028-202012291250ND
2021-02-19CA5410038_032_032-202102191100ND
2021-02-19CA5410038_028_028-202102191125ND
2021-02-19CA5410038_027_027-202102191215ND
2021-05-27CA5410038_028_028-202105271235ND
2021-09-13CA5410038_009_009-202109131205ND
2021-09-13CA5410038_016_016-202109131140ND
2021-09-13CA5410038_020_020-202109131152ND
2021-09-13CA5410038_024_024-202109131244ND
2021-09-13CA5410038_002_002-202109131158ND
2021-09-13CA5410038_028_028-202109131325ND
2021-11-15CA5410038_028_028-202111151325ND
2022-03-29CA5410038_028_028-202203291115ND
2022-09-19CA5410038_025_025-202209191232ND
2022-09-19CA5410038_028_028-202209191305ND
2023-07-24CA5410038_001_001-202307241220ND
2023-12-04CA5410038_028_028-202312041315ND