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Hillsboro, OR Water Quality Report

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Sources Of Drinking Water in Hillsboro, Oregon

Where does Hillsboro get its water from? Water from the Portland Water Bureau primarily comes from the Bull Run watershed and is piped to a 50-million gallon storage reservoir on Powell Butte, located on the east side of Portland. Currently, chlorine and ammonia are added to the water to disinfect it to meet federal drinking water standards. It is also adjusted for pH to make the water less corrosive to pipes. The Portland Water Bureau also uses the Columbia South Shore Wellfield to augment the Bull Run supply. Drawn from 25 wells and four aquifers, it is capable of producing close to 100 million gallons per day (MGD).

The Joint Water Commission (JWC) is comprised of water from Hagg Lake (Scoggins Reservoir) and the Barney Reservoir released into the upper portion of the Tualatin River. When flows are available, water from the Tualatin River is used. It is then withdrawn and filtered through the JWC water treatment plant. Chlorine and pH adjustments are added before leaving the plant. Is Hillsboro's water safe to drink?

Source: City of Hillsboro

 

 

Contaminants Found in Hillsboro'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).

Radiological contaminants

This utility detected 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.

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. 

Potential Health Effects of Consuming These Contaminants

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 Radiological contaminants in excess of the health guidelines

Cancer: No standard exist for this contaminant. This utility detected Radon, Radium, combined (-226 & -228), Radium-226 & 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.

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.

Contaminant Levels Compared to Other Regions

Chromium (hexavalent)

 - Health Guideline: 0.02 ppb

 - National: 0.782 ppb

 - State: 0.236 ppb

 - Hillsboro, OR: 0.153 ppb

Radiological Contaminants

 - No standard exists for this contaminant which cannot be good.

Total Trihalomethanes (TTHMs)

 - Health Guideline: 0.8 ppb

 - State: 22.9 ppb

 - National: 23.4 ppb

 - Hillsboro, OR: 34.1 ppb

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April Jones

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

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