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Clear Lake City, Texas Water Quality Report

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Sources Of Drinking Water in Clear Lake City, Texas

Local lakes and rivers supply the Clear Lake City surface water resources. Eighty-six percent of our supply flows from the Trinity River into Lake Livingston, and from the San Jacinto River into Lake Conroe and Lake Houston.  Deep underground wells drilled into the Evangeline and Chicot aquifers currently provide the other 14 percent of the City’s water supply. Can you drink tap water in Clear Lake City?

Source: City of Houston/Clear Lake City

Contaminants Found in Clear Lake City's 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.

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.

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. 

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 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 dibromochloromethane  in excess of health guideline

Cancer:  The health guideline of 0.1 ppb for dibromochloromethane 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 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.

Contaminant Levels in Clear Lake City, Texas Compared to Other Regions

1,2,3-Trichloropropane

 - Health Guideline: 0.0007 ppb

 - State: 0.000517 ppb

 - Clear Lake City, TX: 0.00143 ppb

 - National: 0.000318 ppb

Bromodichloromethane

- Health Guideline: 0.06 ppb

 - State: 4.29 ppb

 - Clear Lake City, TX: 9.18 ppb

 - National: 4.38 ppb

Chloroform

 - Health Guideline: 1.0 ppb

 - State: 6.64 ppb

 - National: 11.4 ppb

 - Clear Lake City, TX: 22.4 ppb

Dibromochloromethane

 - Health Guideline: 0.7 ppb

 - State: 6.35 ppb

 - National: 6.00 ppb

 - Clear Lake City, TX: 2.44 ppb

Dichloroacetic acid

 - Health Guideline: 0.7 ppb

 - State: 6.35 ppb

 - National: 6.00 ppb

 - Clear Lake City, TX: 21.2 ppb

Total trihalomethanes (TTHMs)

 - Health Guideline: 0.8 ppb

 - State: 25.8 ppb

 - National: 23.4 ppb

 - Clear Lake City, TX: 34.2 ppb

Trichloroacetic acid

 - Health Guideline: 0.5 ppb

 - State: 3.33 ppb

 - National: 4.93 ppb

 - Clear Lake City, TX: 7.19 ppb

Radiological contaminants  

No long term health 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.

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Jason Nash

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

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