Water is our most valuable shared resource and together we can keep it
that way for generations to come.
The Water Quality Report

2017 Consumer Confidence Report

In order to ensure that tap water is safe to drink, the United States Environmental Protection Agency (USEPA) and the Montana Department of Environmental Quality (DEQ) have established regulations for more than 90 substances in drinking water that limit the amount of certain contaminants in water provided by public water systems. Every year Mountain Water Company tests for the presence of metals, pesticides, inorganic and organic chemicals, and microbiological organisms, that provide our customers with the results in a detailed water quality report. The tables in these reports compare the levels of contaminants in your tap water to the USEPA health regulations so you can understand and be assured of the quality of the water delivered to your home. To view our Water Quality Reports, select one from the list to the left.

Mountain Water Company is proud to tell you that there have been no contaminants detected that exceed any federal or state drinking water standards.

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. This report describes those contaminants that have been detected in our analysis of 145 different potential contaminants, almost 100 of which are regulated by EPA and the DEQ. All primary (health related) and secondary (aesthetic) drinking water standards are being met. More information about contaminants and potential health effects can be obtained by calling the United States Environmental Protection Agency’s (USEPA) Safe Drinking Water Hotline at 1-800-426-4791 or visiting their website at http://www.epa.gov/safewater/ .

Some people may be more vulnerable to contaminants in drinking water than the general population. Immunocompromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. EPA/Centers for Disease Control guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are also available from http://www.epa.gov/safewater/ .

Complete records of water quality analyses are open for inspection by the public upon request.


- The Missoula Aquifer
- Watershed
- Rattlesnake Lakes
- Backflow/Cross-Connection
- The Water Quality Report
- Water Quality Questions
- Bottled Water vs. Tap Water
- The Milltown Dam
- Private Wells vs. Regulated Water
- Source Water Delineation & Assessment



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