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Longmont Water Quality Report

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Sources Of Longmont, Colorado Drinking Water

The City of Longmont has a varied and extensive portfolio of water rights that include decrees for pipelines, storage reservoirs, irrigation rights, and contract rights as well as conditional decrees and applications filed in Water Court for additional decrees.

Source: https://www.longmontcolorado.gov/departments/departments-n-z/water/water-resources-supply

Contaminants Found in Longmont'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).

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.

Radiological Contaminants 

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

Source: https://www.ewg.org/tapwater

Potential Health Effects of Consuming These Contaminants

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 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 Radiological Contaminants in your drinking water

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

Source: https://www.ewg.org/tapwater/

Contaminant Levels Compared to Other Regions

Chromium (hexavalent)

Health Guideline: 0.02 ppb

  • State: 0.0832 ppb
  • Longmont, CO: 0.0428 ppb
  • National: 0.782 ppb

Total trihalomethanes (TTHMs)

Health Guideline: 0.8 ppb

  • National: 23.4 ppb
  • State: 24.2 ppb 
  • Longmont, CO: 31.2 ppb

Radiological Contaminants

Health Guideline: N/A

Source: https://www.ewg.org/tapwater/

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Jason Nash

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

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