Know Your Environment. Protect Your Health.

Simazine

Terra Bella Irrigation District - Tbt

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.

 

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 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
2018-09-24CA5410038_024_024-201809241415ND
2018-09-24CA5410038_032_032-201809241300ND
2018-09-24CA5410038_009_009-201809241354ND
2018-09-24CA5410038_016_016-201809241335ND
2018-09-24CA5410038_020_020-201809241342ND
2018-09-24CA5410038_002_002-201809241345ND
2018-09-24CA5410038_027_027-201809241445ND
2018-12-27CA5410038_027_027-201812271250ND
2018-12-27CA5410038_032_032-201812271200ND
2019-02-26CA5410038_027_027-201902261318ND
2019-02-26CA5410038_032_032-201902261152ND
2019-05-10CA5410038_032_032-201905101155ND
2019-05-10CA5410038_027_027-201905101310ND
2019-08-29CA5410038_025_025-201908291300ND
2019-08-29CA5410038_032_032-201908291208ND
2019-08-29CA5410038_027_027-201908291340ND
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_027_027-202102191215ND
2021-02-19CA5410038_028_028-202102191125ND
2021-05-27CA5410038_028_028-202105271235ND
2021-09-13CA5410038_002_002-202109131158ND
2021-09-13CA5410038_016_016-202109131140ND
2021-09-13CA5410038_009_009-202109131205ND
2021-09-13CA5410038_020_020-202109131152ND
2021-09-13CA5410038_028_028-202109131325ND
2021-09-13CA5410038_024_024-202109131244ND
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