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Boise Water Quality Report

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Sources Of Drinking Water in Boise, Idaho

 Approximately 70% of your water is supplied from 79 wells located throughout the Boise area. The remaining 30% of your water comes from two surface water treatment plants (Marden Water Treatment Plant and Columbia Water Treatment Plant), which both treat water from the Boise River.

Source: https://www.mysuezwater.com/sites/default/files/IDCCR2017.pdf

Contaminants Found in Seattle'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. Click here to read more about arsenic.

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.

Manganese

Manganese is a naturally occurring element that is common in food and drinking water. Excessive manganese exposures may impair children's attention, memory and intellectual capacity. Click here to read more about manganese.

Radiological contaminants

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

Tetrachloroethylene (perchloroethylene)

Dry cleaning chemical tetrachloroethylene, or perc, can cause cancer. It pollutes soil and groundwater due to emissions from dry cleaning facilities, and automotive, metalworking and other industries.

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/tapwater/system.php?pws=ID4010016

Potential Health Effects of Consuming These Contaminants

Health risks of Arsenic in excess of the health guidelines

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 Chromium (hexavalent) in excess of the health guidelines

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 Manganese in excess of the health guidelines 

Harm to the brain and nervous system: The health guideline of 100 ppb for manganese was defined by Minnesota as a risk assessment advisory level, a non-enforceable guideline. This health guideline protects against harm to the brain and nervous system.

Health risks of Radiological contaminants in excess of the health guidelines

Cancer: 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.

Health risks of Tetrachloroethylene (perchloroethylene) in excess of the health guidelines

Cancer: The health guideline of 0.06 ppb for tetrachloroethylene 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 Total trihalomethanes (TTHMs) in excess of the health guidelines 

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/tapwater/system.php?pws=ID4010016

Contaminant Levels Compared to Other Regions

Arsenic

 - Health Guideline: 0.004 ppb

 - National: 1.33 ppb

 - Boise, ID: 2.47 ppb

 - State: 3.70 ppb

Chromium (hexavalent)

 - Health Guideline: 0.02 ppb

 - Boise, ID: 0.429 ppb

 - National: 0.782 ppb

 - State: 0.884 ppb

Manganese

 - National: 28.3 ppb

 - State: 52.7 ppb

 - Health Guideline: 100 ppb

 - Boise, ID: 120 ppb

Radiological Contaminants

 - N/A

Tetrachloroethylene (perchloroethylene)

 - National: 0.0146 ppb

 - State: 0.0188 ppb

 - Health Guideline: 0.0600 ppb

 - Boise, ID: 0.0840 ppb

Total trihalomethanes (TTHMs)

 - Health Guideline: 0.8 ppb

 - State: 13.6 ppb

 - National: 23.4 ppb

 - Boise, ID: 27.6 ppb

Source: https://www.ewg.org/tapwater/system.php?pws=ID4010016

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Jason Nash

A hiker, blogger, and water quality expert...

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