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Boulder Water Quality Report

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Sources Of Boulder, Colorado Drinking Water

The City of Boulder gets its water from Barker Reservoir, Lakewood Reservoir, Boulder Reservoir and Carter Lake (via the Boulder Feeder Canal). Water used at your home or business may come from any of these sources, depending on the season or availability.

Source: https://www-static.bouldercolorado.gov/docs/water-report.pdf

Contaminants Found in Boulder's Water Supply

(Detected above health guidelines)

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. Read more about chromium (hexavalent).

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.

Hormones

This utility detected Testosterone.

Source: https://www.ewg.org/tapwater/system.php?pws=CO0107152

Potential Health Effects of Consuming These Contaminants

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 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.

Health risks of hormones in your drinking water

Hormones in drinking water come from human and animal wastewater discharged into drinking water sources. Conventional drinking water treatment does not remove hormones.

Source: https://www.ewg.org/tapwater/system.php?pws=CO0107152

Contaminant Levels Compared to Other Regions

Chromium (hexavalent)

Health Guideline: 0.02 ppb

  • State: 0.0832 ppb
  • Boulder, CO: 0.171 ppb
  • National: 0.782 ppb

Total trihalomethanes (TTHMs)

Health Guideline: 0.8 ppb

  • National: 23.4 ppb
  • State: 24.2 ppb 
  • Boulder, CO: 36.0 ppb

Hormones

Health Guideline: N/A

Source: https://www.ewg.org/tapwater/system.php?pws=CO0107152

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Jason Nash

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

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