Drinking Water Quality Report

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The City of Tumwater’s annual Drinking Water Quality report details water quality sampling results collected during the previous year. The dedicated City staff who operate and maintain the water system continually strive to ensure that the water delivered to your tap is of the highest quality possible.

Download reports

2017 Water Quality Report pdf-icon-sm       

2016 Water Quality Report pdf-icon-sm

2015 Water Quality Report pdf-icon-sm

2014 Water Resources | Programs & Utilities pdf-icon-sm


2013 Water Quality Report
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2012 Water Quality Report  pdf-icon-sm

What we look for in your water

  • Microbial contaminants – such as viruses and bacteria – may come from sewage treatment plants, septic systems, agricultural livestock operations and wildlife.
  • Inorganic analyte – such as salts and metals – can occur naturally in soils or result from urban stormwater runoff, industrial or domestic wastewater discharges, oil and gas production, as well as mining or farming.
  • Pesticides and herbicides, coming from a variety of residential and agricultural sources, can easily infiltrate into the groundwater if over-applied or used incorrectly.
  • Organic chemical contaminants, including synthetic and volatile organic chemicals, are by-products of industrial processes and petroleum products. They can also come from gas stations, dry cleaners, urban stormwater runoff and septic systems.
  • Radioactive contaminants that are naturally occurring, or the result of oil and gas production and mining activities. 

To ensure that tap water is safe to drink, the EPA and the Washington State Department of Health regulate the maximum allowable amount of certain substances in water provided by public water systems. The U.S. Food and Drug Administration and/or Washington State Department of Agriculture regulations establish limits for contaminants in bottled water, which provide the same level of protection.

Drinking water may reasonably be expected to contain at least small amounts of some substances. The presence of a minute amount of a contaminant does not necessarily indicate that the water poses a health risk.

Some people may be more vulnerable to contaminants in drinking water than the general population. Persons with compromised immune systems (such as those undergoing chemotherapy), persons who have undergone organ transplants, people with HIV/AIDS or other autoimmune syndromes, as well as some elderly and infants can be particularly at risk. These populations should seek advice about drinking water from their health care providers.

Learn more...

For more information about groundwater, drinking water and possible contaminants including cryptosporidium and other microbial contaminants, and potential health effects, visit http://www.epa.gov/water, or call the EPA Safe Drinking Water Hotline at 1-800-426-4791.