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Las Vegas Water Quality Report

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Sources Of Drinking Water in Las Vegas, Nevada

Nearly 90 percent of your water comes from Lake Mead. Nearly all of the lake's water originates as snowmelt in the Rocky Mountains that flows down the Colorado River. 

The remaining water–about 10 percent–comes from wells that tap a deep groundwater aquifer beneath the Las Vegas Valley. That aquifer is naturally replenished by precipitation in the Spring Mountains and the Sheep Range. 

Groundwater is used mainly May 1-Oct. 1 each year to meet peak water demand. Some groundwater wells also may operate Oct. 1-March 31 to optimize resources and minimize levels of trihalomethane, a treatment by-product. This helps the Water District ensure compliance with water-quality standards. If you live or work within several miles of the Water District's offices at Charleston and Valley View boulevards, or in the northwest valley, you may receive a blend of groundwater and treated Lake Mead water.

Source: Las Vegas Valley Water District

Contaminants Found in the Las Vegas Water Supply

(Detected above health guidelines)

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.

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. Read more about chromium (hexavalent).

Dibromochloromethane

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

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

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

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.

Hormones

This utility detected Testosterone.

Source: EWG Tap Water Database - Las Vegas

Potential Health Effects of Consuming These Contaminants

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 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 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 dibromochloromethane in excess of health guideline 

Cancer: The health guideline of 0.7 ppb for dibromochloromethane 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 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 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 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 hormones in excess of health guideline 

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

Source: EWG Tap Water Database - Las Vegas

Contaminant Levels Compared to Other Regions

Bromodichloromethane

 - Health Guideline: 0.4 ppb

 - State: 1.92 ppb

 - National: 4.37 ppb

 - Las Vegas, NV: 17.0 ppb

Chloroform

 - Health Guideline: 1.0 ppb

 - State: 3.07 ppb

 - National: 11.4 ppb

 - Las Vegas, NV: 22.5 ppb

Chromium (hexavalent)

 - Health Guideline: 0.02 ppb

 - Las Vegas, NV: 0.204 ppb

 - State: 0.640 ppb

 - National: 0.782 ppb

Dibromochloromethane

 - Health Guideline: 0.7 ppb

 - State: 1.82 ppb

 - National: 2.99 ppb

 - Las Vegas, NV: 13.2 ppb

Dichloroacetic acid

 - Health Guideline: 0.7 ppb

 - State: 1.61 ppb

 - National: 6.00 ppb

 - Las Vegas, NV: 11.9 ppb

Radiological Contaminants

 - N/A

Total trihalomethanes (TTHMs)

 - Health Guideline: 0.8 ppb

 - State: 9.5 ppb

 - National: 23.4 ppb

 - Las Vegas, NV: 55.2 ppb

Trichloroacetic acid

 - Health Guideline: 0.5 ppb

 - State: 1.29 ppb

 - National: 4.93 ppb

 - Las Vegas, NV: 5.83 ppb

Hormones

 - N/A

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Jason Nash

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