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Jonesborough Water Quality Report

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Sources Of Drinking Water in Jonesborough, Tennessee

The City of Johnson City relies on water from the Watauga River and Unicoi Springs.

Source: 2017 Jonesborough Water Quality Report

Contaminants Found in Jonesborough, TN Water Supply

(Detected above health guidelines)

Bromodichloromethane

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.

Chloroform

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.

Chromium (hexavalent)

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater.

Dibromochloromethane

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.

 Total trihalomethanes (TTHMs)

Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform. 

 Source: https://www.ewg.org

Potential Health Effects of Consuming These Contaminants

Health risks of bromodichloromethane in excess of health guideline

Cancer: The health guideline of 0.06 ppb for bromodichloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment 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.

Health risks of chloroform in excess of health guideline

Cancer: The health guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment 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.

Health risks of chromium (hexavalent) in excess of health guideline

Cancer:  The health guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

Health risks of dibromochloromethane in excess of health guideline 

Cancer: The health guideline of 0.1 ppb for dibromochloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment 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.

Health risks of trihalomethanes in excess of health guideline

Cancer: The health guideline of 0.8 ppb for trihalomethanes was defined by the California Office of Environmental Health Hazard Assessment as a draft public health goal, the level of drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

 Source: https://www.ewg.org

Contaminant Levels in Jonesborough, TN Compared to Other Regions

Bromodichloromethane

 - Health Guideline: 0.06 ppb

- State: 2.81 ppb

 - National: 4.38 ppb

 - Jonesborough, TN: 5.97 ppb  

 Chloroform  

 - Health Guideline: 0.4 ppb

- State: 10.2 ppb

 - National: 11.5 ppb  

- Jonesborough , TN: 40.8 ppb       

Chromium (hexavalent)

 - Health Guideline: 0.02 ppb

- Jonesborough, TN: 0.105 ppb

- State: 0.127 ppb

 - National: 0.782 ppb  

Dibromochloromethane

  - Health Guideline: 0.1 ppb

- Jonesborough, TN: 0.577 ppb

 - State: 0.658 ppb

 - National: 3.01 ppb

Total trihalomethanes (TTHMs)

 - Health Guideline: 0.8 ppb

  - National: 23.7 ppb

 - State: 26.2 ppb

 - Knoxville, TN: 59.4 ppb

 

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