Know Your Environment. Protect Your Health.

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

City of Alexandria Water System

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.

 

38

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
2019ND60ND
2020ND50ND
2021ND40ND
2022ND140ND
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
2019-07-2510485165001ND
2019-07-2510485165001ND
2019-09-1110492042002ND
2019-09-1110492042001ND
2019-09-1110492042002ND
2019-09-1110492042001ND
2020-03-2610513223001ND
2020-03-2610513223002ND
2020-06-1710522625001ND
2020-06-1710522625002ND
2020-11-0910539198001ND
2021-01-2610546534001ND
2021-05-0510559746001ND
2021-08-1010574770002ND
2021-08-1010574770001ND
2022-01-0410594243001ND
2022-01-1910595466001ND
2022-02-0210596929003ND
2022-02-0210596929002ND
2022-02-0210596929001ND
2022-02-2310599033001ND
2022-02-2310599298001ND
2022-03-0910600773001ND
2022-03-1610601681001ND
2022-03-2310602231001ND
2022-07-1810618559002ND
2022-07-1810618559001ND
2022-09-1310626422001ND
2022-11-3010636148001ND
2023-02-0610642862001ND
2023-05-3010656320001ND
2023-05-3010656320002ND
2023-07-3110664235001ND
2023-07-3110664235002ND
2023-07-3110664235003ND
2023-11-2710677807001ND
2023-11-2710677807002ND
2023-12-1910679887001ND