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Mesa, Arizona Water Quality Report

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Sources Of Drinking Water in Mesa, Arizona

 

Where does Mesa get its water from? To ensure that your drinking water is always safe, a process is used to treat millions of gallons of raw water that arrive daily at the three water treatment facilities serving Mesa. The City and its water treatment plants must meet rigorous standards established by the Environmental Protection Agency and the Arizona Department of Environmental Quality (ADEQ). The Brown Road Water Treatment Plant is capable of processing 72 million gallons per day and the Signal Butte Water Treatment Plant is capable of processing 24 million gallons per day. Both facilities are operated by ADEQ-certified operators. The raw water that feeds into the plants comes from the Central Arizona Project. The City also gets a portion of its drinking water from the Val Vista Water Treatment Plant, which is owned jointly by the cities of Phoenix and Mesa. Salt River Project supplies the raw water to the Val Vista Plant. Is Mesa's water safe to drink?

Source: City of Mesa, Arizona 

Contaminants Found in Mesa'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.

Chlorite

Chlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide. Chlorite decreases hemoglobin levels and causes other hematologic effects.

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 Radon, Radium, combined (-226 & -228) & Radium-226. 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. 
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

Fluoride

Fluoride occurs naturally in surface and groundwater and is also added to drinking water by many water systems. The fluoride that is added to water is not the naturally occurring kind, the main chemicals used to fluoridate drinking water are known as “silicofluorides” (i.e., hydrofluorosilicic acid and sodium fluorosilicate). Silicofluorides are not pharmaceutical-grade fluoride products; they are unprocessed industrial by-products of the phosphate fertilizer industry (Gross!). Since these silicofluorides undergo no purification procedures, they can contain elevated levels of arsenic — more so than any other water treatment chemical. In addition, recent research suggests that the addition of silicofluorides to water is a risk factor for elevated lead exposure, particularly among residents who live in homes with old pipes.

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 Chlorite in excess of the health guidelines 

Change in blood chemistry: The health guideline of 50 ppb for chlorite 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 change in blood chemistry.

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: 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.

 

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 fluoride in excess of health guideline  

No standards exist for fluoride in water but many consider it to be a neurotoxin.

Contaminant Levels Compared to Other Regions

Arsenic

 - Health Guideline: 0.004 ppb

 - National: 1.33 ppb

 - State: 5.02 ppb

 - Mesa, AZ: 3.57 ppb

Chlorite

 - Health Guideline: 50.0 ppb

 - Mesa, AZ: 223.7 ppb

 - State: 150.1 ppb

 - National: 267.4 ppb

Chromium (hexavalent)

 - Health Guideline: 0.02 ppb

 - National: 0.782 ppb

 - State: 4.69 ppb

 - Mesa, AZ: 5.63 ppb

Radiological Contaminants

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

Total trihalomethanes (TTHMs)

 - Health Guideline: 0.8 ppb

 - State: 13.6 ppb

 - National: 23.4 ppb

 - Mesa, AZ: 45.8 ppb

 

Tetrachloroethylene (perchloroethylene)

 - National: 0.0146 ppb

 - State: 0.00777 ppb

 - Health Guideline: 0.0600 ppb

 - Mesa, AZ: 0.257 ppb

 

Fluoride

- Legal Limit: 4 ppb

 - State: 0.776 ppb

 - National: 0.440 ppb

 - Mesa, AZ: 0.318 ppb

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April Jones

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

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