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Dallas Water Quality Report

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Sources Of Drinking Water in Dallas, Texas

Where does Dallas get its water from? Dallas’ water supply comes from 6 reservoirs and the Elm Fork of the Trinity River: Grapevine, Lewisville, Ray Roberts, Ray Hubbard, Fork and Tawakoni.  Ray Hubbard is the only reservoir completely owned and operated by the City of Dallas, Texas.  Although there is an aquifer below Dallas, well water hasn’t been used for multiple years due to the aquifer's poor water quality.

City of Dallas uses settling, filtering, chemicals, and ozone disinfection to purify its drinking water:  Chloramine (a combination of chlorine and ammonia, which is less hazardous than chlorine alone) and ozone for are used for disinfection; lime and iron sulfate are used to remove suspended solids and for corrosion control; and activated carbon is used to control taste and odor.  Fluoride (A known neurotoxin) is also added to the water to prevent tooth decay. Is Dallas' water safe to drink?

Source: City of Dallas

Contaminants Found in Dallas' Water Supply

(Detected above health guidelines)

1,2,3-Trichloropropane

1,2,3-Trichloropropane is a potent carcinogen that contaminates drinking water in agricultural regions where it was historically used as soil fumigant.

Arsenic

The health guideline of 0.0007 ppb for 1,2,3-trichloropropane 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.

Atrazine

Atrazine is a herbicide commonly detected in drinking water that comes from cornfield and other agricultural runoff. It is a hormone disrupter that harms the male and female reproductive systems of people and wildlife.

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.

Bromoform

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.

Chloroform

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform 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.

Dichloroacetic acid

Dichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.

Radiological contaminants 

Radiological contaminants leach into water from certain minerals and from mining. This utility detected Radium, combined (-226 & -228).

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.

Trichloroacetic acid

Trichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. 

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 — moreso 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 1,2,3-Trichloropropane in excess of health guideline

Unknown: The health guideline of 0.0007 ppb for 1,2,3-trichloropropane 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. 

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 atrazine in excess of health guideline 

Cancer: The health guideline of 0.1 ppb for atrazine was defined by EWG based on epidemiological studies of human exposure to atrazine in drinking water.. This health guideline protects against harm to the developing fetus, harm to the reproductive system and hormone disruption.

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 bromoform in excess of health guideline

Cancer: The health guideline of 0.5 ppb for bromoform was proposed in 2018 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 chloroform in excess of health guideline

Cancer: The health guideline of 1 ppb for chloroform 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 dichloroacetic acid in excess of health guideline

Cancer: The health guideline of 0.7 ppb for dichloroacetic acid was defined by the Environmental Protection Agency 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 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 trichloroacetic acid in excess of health guideline

Cancer: The health guideline of 0.5 ppb for trichloroacetic acid was defined by the Environmental Protection Agency 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 radiological contaminants in excess of health guidelines

Birth defects: Drinking water contamination with radioactive substances increases the risk of cancer and may harm fetal development.

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.

Source: Environmental Working Group

Contaminant Levels in Dallas, Texas Compared to Other Regions

1,2,3-Trichloropropane

 - Health Guideline: 0.0007 ppb

 - State: 0.000517 ppb

 - Dallas, TX: 0.00250 ppb

 - National: 0.000318 ppb

Arsenic

 - Health Guideline: 0.004 ppb

 - State: 1.99 ppb

 - Dallas, TX: 0.317 ppb

 - National: 1.30 ppb

Atrazine

 - Health Guideline: 0.1 ppb

 - State: 0.0188 ppb

 - Dallas, TX: 0.110 ppb

 - National: 0.0135 ppb

Bromodichloromethane

- Health Guideline: 0.06 ppb

 - State: 4.29 ppb

 - Dallas, TX: 6.08 ppb

 - National: 4.38 ppb

Bromoform

- Health Guideline: 0.5 ppb

 - State: 3.22 ppb

 - Dallas, TX: 0.567 ppb

 - National: 1.77 ppb

Chloroform

 - Health Guideline: 1.0 ppb

 - State: 6.64 ppb

 - National: 11.4 ppb

 - Dallas, TX: 6.65 ppb

Chromium (hexavalent)

 - Health Guideline: 0.02 ppb

 - Dallas, TX: 0.275 ppb

 - State: 0.265 ppb

 - National: 0.782 ppb

Dichloroacetic acid

 - Health Guideline: 0.7 ppb

 - State: 6.35 ppb

 - National: 6.00 ppb

 - Dallas, TX: 2.77 ppb

Total trihalomethanes (TTHMs)

 - Health Guideline: 0.8 ppb

 - State: 25.8 ppb

 - National: 23.4 ppb

 - Dallas, TX: 16.2 ppb

Trichloroacetic acid

 - Health Guideline: 0.5 ppb

 - State: 3.33 ppb

 - National: 4.93 ppb

 - Dallas, TX: 1.61 ppb

Radiological contaminants  

No information available about this contaminant but it cannot be good. This utility detected Radium, combined (-226 & -228). 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.

Fluoride

 - Legal Limit: 4 ppb

 - State: 0.684 ppb

 - National: 0.440 ppb

 - Dallas, TX: 0.529 ppb

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April Jones

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

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