Know Your Environment. Protect Your Health.

Simazine

San Antonio Water Company

Simazine is a hormone-disrupting herbicide related to atrazine. It affects the male and female reproductive systems. In studies of laboratory animals, simazine increases blood levels of estrogen, decreases prolactin and progesterone, and causes mammary and ovarian tumors.

 

19

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
2019N/A00N/A
2020ND100ND
2021N/A00N/A
2022N/A00N/A
2023ND90ND

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 simazine 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): 4 ppb

The legal limit for simazine, established in 1992, was based on toxicity studies 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
2020-04-07CA3610085_021_021-202004071020ND
2020-09-29CA3610085_016_016-202009291145ND
2020-09-29CA3610085_001_001-202009291040ND
2020-09-29CA3610085_018_018-202009290800ND
2020-10-06CA3610085_013_013-202010061150ND
2020-10-06CA3610085_017_017-202010061130ND
2020-10-06CA3610085_002_002-202010061100ND
2020-10-13CA3610085_011_011-202010130900ND
2020-10-13CA3610085_003_003-202010130830ND
2020-10-14CA3610085_004_004-202010140930ND
2023-04-20CA3610085_021_021-202304201200ND
2023-07-06CA3610085_003_003-202307061110ND
2023-07-06CA3610085_017_017-202307061400ND
2023-07-06CA3610085_011_011-202307061155ND
2023-07-06CA3610085_013_013-202307061425ND
2023-07-10CA3610085_016_016-202307101515ND
2023-07-10CA3610085_001_001-202307101445ND
2023-07-12CA3610085_004_004-202307120930ND
2023-07-12CA3610085_002_002-202307121140ND