
Mountlake Terrace, Washington | Municipal Water Utility Company | Public Service Announcement
Local tap water in Mountlake Terrace may be compromised by several concerning contaminants including Bromochloroacetic acid, Trichlorofluoromethane, Alachlor (Lasso) and Bromochloromethane, along with elevated water hardness levels. The City of Mountlake Terrace supplies residents with municipal water sourced from purchased groundwater supplies throughout the service area.
What's in your tap water?
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City of Mountlake Terrace Area Details

Area served:
Mountlake Terrace, Washington

Population served:
20847

Water source:
Purchased groundwater

Phone:
425-776-1161

Address:
6100 219th Street Sw, Suite 200, Mountlake Terrace, WA 98043

3date
Contaminants Detected In Mountlake Terrace, Washington
Bromodichloromethane; Chloroform; Chromium (hexavalent); Dichloroacetic acid; Total trihalomethanes (TTHMs); Trichloroacetic acid; Arsenic; Monochloro… more

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City of Mountlake Terrace
Annual Municipal Water Report
List of Municipal Water Contaminants Tested by City of Mountlake Terrace
Tested But Not Detected:
1,1-Dichloroethane; 1,2,3-Trichloropropane; 1,3-Butadiene; 1,4-Dioxane; Bromochloroacetic acid; Bromochloromethane; Bromoform; Bromomethane; Chlorodifluoromethane; Chloromethane; Cobalt; Dibromoacetic acid; Dibromochloromethane; Molybdenum; Monobromoacetic acid; Perfluorobutane sulfonate (PFBS); Perfluoroheptanoic acid (PFHPA); Perfluorohexane sulfonate (PFHXS); Perfluorononanoic acid (PFNA); Perfluorooctane sulfonate (PFOS); Perfluorooctanoic acid (PFOA)

What's in your tap water?

Find out which contaminants are found above Legal and Health Guidelines.
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City of Mountlake Terrace
About Us
Every water source (including both tap and bottled water) contains some level of contaminants. As water flows across land surfaces or through the ground, it dissolves naturally-occurring minerals and can pick up substances from animal presence or human activities. Potential contaminants in source water include:
- Microbial contaminants such as viruses and bacteria, which may come from sewage treatment facilities, septic systems, agricultural operations, and wildlife.
- Inorganic contaminants like salts and metals, which can occur naturally or result from urban stormwater runoff, industrial/domestic wastewater discharges, oil/gas production, mining, or farming.
- Pesticides and herbicides from agriculture, urban stormwater runoff, and residential usage.
- Organic chemical contaminants, including synthetic and volatile organics that are byproducts of industrial processes and petroleum production, and can also come from gas stations, urban stormwater runoff, and septic systems.
- Radioactive contaminants that can occur naturally or result from oil/gas production and mining.
To ensure tap water safety, the EPA establishes regulations limiting contaminant levels in public water systems. FDA regulations set similar limits for bottled water to provide equivalent public health protection. Municipal water, including bottled varieties, can reasonably be expected to contain at least small amounts of some contaminants, though their presence doesn't necessarily indicate a health risk. For more information about contaminants and potential health effects, contact the EPA Safe Drinking Water Hotline at 1-800-426-4791.
Certain populations may be more vulnerable to water contaminants than others. Immuno-compromised individuals, including those undergoing chemotherapy, organ transplant recipients, people with HIV/AIDS or other immune disorders, some elderly persons, and infants may face increased infection risks. These individuals should seek advice about drinking water from their healthcare providers. EPA/CDC guidelines on reducing Cryptosporidium infection risk are available from the Safe Drinking Water Hotline at 1-800-426-4791.

For more information on your municipal water, visit the U.S. Environmental Protection Agency:
City of Mountlake Terrace Municipal Water Company and EPACity of Mountlake Terrace Municipal Water Report Info
The City of Mountlake Terrace, Moses Lake and surrounding water systems have a rich history dating back to indigenous communities. For generations, tribal peoples established camps along lake shores to gather natural resources including roots and waterfowl eggs. Chief Moses (1829-1899), a prominent Columbia-Sinkiuse tribal leader, gave his name to the region and waterways that would later support developing communities.
The arrival of settlers created competition for water access, transforming traditional native lands first into livestock ranges and later into irrigated orchards. The early settlement, initially platted in 1911, faced significant challenges from water rights disputes and economic hardships during the Great Depression. Fruit orchards eventually gave way to potato and onion fields as agricultural priorities shifted.
By 1913, legal complications regarding water distribution had significantly hindered community development. Infrastructure suffered, with livestock roaming freely through unpaved streets and wooden walkways falling into disrepair. Water rights conflicts directly impacted land sales until reassignment to local irrigation districts in 1929 allowed for dam construction and allocation of irrigation water.
Despite challenging times, residents collaborated to improve local conditions, forming business associations that influenced highway development and advocated for irrigation projects. The establishment of military facilities, tourism growth, and reliable irrigation transformed the region into a thriving agricultural center serving as the population and service hub for the surrounding basin.
Municipal Water Utility Company FAQ

For more information on your municipal water, visit the U.S. CDC:
City of Mountlake Terrace Municipal Water Company and CDC.. ...

City of Mountlake Terrace provides municipal water services to the public of Mountlake Terrace and Mountlake Terrace, Washington.
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