Know Your Environment. Protect Your Health.

Atrazine

Windmill Ranch Subdivision

NOTE: Windmill Ranch Subdivision purchases water from Clwsc Canyon Lake Shores which is required to test for atrazine. Sample information shown below was taken by Clwsc Canyon Lake Shores.

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
2018ND10ND
2019ND80ND
2020ND30ND
2021ND20ND
2022ND70ND
2023ND70ND

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

NOTE: Windmill Ranch Subdivision purchases water from Clwsc Canyon Lake Shores which is required to test for atrazine. Sample information shown below was taken by Clwsc Canyon Lake Shores.

Date Lab ID Result
2018-02-07AE12864ND
2018-05-16AE26642ND
2018-05-16AE26641ND
2018-05-17AE26864ND
2018-05-17AE26868ND
2018-05-17AE26866ND
2018-05-17AE26865ND
2018-05-17AE26867ND
2018-07-26AE34740ND
2018-11-06AE45478ND
2019-02-06AE53297ND
2019-02-06AE53298ND
2019-02-06AE53299ND
2019-04-23AE63418ND
2019-10-29AE87872ND
2019-10-30AE88037ND
2019-10-30AE88039ND
2019-10-30AE88038ND
2020-03-17AF03393ND
2020-07-23AF20513ND
2020-10-14AF30692ND
2020-10-14AF30699ND
2021-03-11AF46649ND
2021-04-21AF50993ND
2021-05-12AF53669ND
2021-05-12AF53670ND
2021-05-12AF53672ND
2021-05-12AF53686ND
2021-05-12AF53667ND
2021-08-24AF67810ND
2021-08-24AF67811ND
2021-08-24AF67812ND
2021-11-30Q2133097001ND
2022-02-07AF83521ND
2022-02-07AF83522ND
2022-04-11AF92739ND
2022-06-22AG02034ND
2022-06-22AG02047ND
2022-08-23AG10641ND
2022-08-23AG10642ND
2023-02-08AG28130ND
2023-04-12AG36649ND
2023-06-29AG46875ND
2023-09-12AG55852ND
2023-09-12AG55855ND
2023-10-17AG60135ND
2023-11-09AG63136ND