Track your tap water quality with EPA-verified data on contaminants, violations, and health guidelines, updated quarterly from official water system monitoring results.
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42 water systems serve San Juan, Washington. Select one or more to filter the data below.
Comprehensive analysis of your water quality, showing both detected contaminants and violations history. Note that exceeding EPA contaminant levels in a single test doesn't always constitute a violation, as violations typically require sustained exceedances or failure to follow required treatment protocols.
View detected contaminants and concentration levels for your water system(s).
Information about data sources, coverage, updates, and contact details for your local water systems.
Water quality data comes from 2024 Consumer Confidence Reports (CCRs), which detail 2023 water quality levels. Additional data is sourced from EPA's Safe Drinking Water Information System (SDWIS Federal Database). Fluoridation status data is provided by the CDC's My Water's Fluoride (MWF Database).
This comprehensive analysis covers all Community Water Systems serving San Juan. These systems provide water to at least 25 year-round residents through public infrastructure.
Consumer Confidence Reports (CCRs) are required annual reports that water systems must deliver to customers by July 1st each year, containing water quality data from the previous calendar year. Additionally, water systems submit quarterly reports to the EPA for violations, and fluoridation status information is provided by states on a voluntary basis.
For specific questions about water quality or violations in your area, contact information for each water system is provided in the Water Systems section above. Direct communication with your local water authority ensures the most current information.