Know Your Environment. Protect Your Health.

2,3,7,8-TCDD (Dioxin)

San Antonio Water Company

Dioxins are contaminants released from chemical manufacturing, pulp and paper bleaching, and incineration of products that contain chlorine. 2,3,7,8-Tetrachlorodibenzodioxin (2,3,7,8-TCDD) is the most toxic chemical in the group of dioxins. Read More.

Dioxins are among the most toxic known environmental pollutants. As a class, dioxins are extremely toxic, persistent and bioaccumulative; these contaminants build up and are stored in fatty tissues and fluids, such as breast milk, and pass from the mother to the child. Most people are exposed to dioxins through the food they eat, primarily from meat, dairy, fish and eggs. In humans, dioxins are associated with cancer, birth defects, damage to the nervous and immune systems, altered metabolism, thyroid disruption, altered menstrual cycling and damage to the cardiovascular system.

 

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

ppt = parts per trillion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.0002 ppt

The EWG Health Guideline of 0.0002 ppt for 2,3,7,8-TCDD was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

EPA Maximum Contaminant
Level (MCL): 0.03 ppt

ppt = parts per trillion

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_003_003-202010130830ND
2020-10-13CA3610085_011_011-202010130900ND
2020-10-14CA3610085_004_004-202010140930ND
2023-04-20CA3610085_021_021-202304201200ND
2023-07-06CA3610085_017_017-202307061400ND
2023-07-06CA3610085_011_011-202307061155ND
2023-07-06CA3610085_013_013-202307061425ND
2023-07-06CA3610085_003_003-202307061110ND
2023-07-10CA3610085_001_001-202307101445ND
2023-07-10CA3610085_016_016-202307101515ND
2023-07-12CA3610085_002_002-202307121140ND
2023-07-12CA3610085_004_004-202307120903ND