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Missoula Water Quality Report

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Sources Of Drinking Water in Missoula, Montana

The water provided to the Missoula Valley comes from 40 ground water wells that draw water from the valley’s ground water aquifer. This aquifer is recharged by runoff from precipitation and snowmelt.

Source: 2018 - Consumer-Confidence-Report

Contaminants Found in Missoula's Water Supply

(Detected above health guidelines)

Arsenic 

Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S.

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.

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.

Radiological contaminants

This utility detected Radium, combined (-226 & -228)Radium-226Radium-228 & Uranium

Radiological contaminants leach into water from certain minerals and from mining. Drinking water contamination with radioactive substances increases the risk of cancer and may harm fetal development.

Potential Health Effects of Consuming These Contaminants

 Health risks of Arsenic in excess of health guideline

Cancer: The health guideline of 0.004 ppb for arsenic 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 bromodichloromethane in excess of health guideline

Cancer: The health guideline of 0.4 ppb for bromodichloromethane was defined 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 guidelines

Cancer & Birth Defects: Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.

Health risks of Radiological contaminants: Cancer

Contaminant Levels in Billings Compared to Other Regions

 Arsenic

 - Health Guideline: 0.004 ppb

- Missoula, MT: 1.11 ppb

- National: 1.30 ppb

 - State: 1.67 ppb

  Bromodichloromethane

 - Health Guideline: 0.06 ppb

- Missoula, MT: 0.123 ppb

 - State: 3.29 ppb

 - National: 4.38 ppb

Chromium (hexavalent)

 - Health Guideline: 0.02 ppb

- State: 0.135 ppb

- Missoula, MT: 0.154 ppb

- National: 0.782 ppb

Dibromochloromethane 

 - Health Guideline: 0.1 ppb

 - Missoula, MT: 0.185 ppb

 - State: 1.47 ppb

 - National: 3.01 ppb

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