Bacteria in St. Louis County Water: Understanding Local Water Records for Household Treatment
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Autotrol Bacteria & Coliform (Well) Filter
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Reading the Bacteria Sampling Record as a St. Louis County Homeowner
Understanding the Source and System Serving You
The Duluth public water system in St. Louis County draws water from surface sources, serving over 86,000 residents through nearly 29,000 connections. This broad system provides context but not specifics about any one household’s water.
Reported Health-Based Issues
EPA records show one health-based violation for this system, indicating an issue identified somewhere within the system’s service area at some time. This does not necessarily apply to every household's water supply.
Importance of Median and Range
Water quality data often include median values and ranges, which show typical and extreme levels found during sampling across the system. These indicate what has been detected but do not specify conditions at any single home.
What You Should Record Before Choosing Treatment for Bacteria
Source Type and Location
Note whether your water comes from a public surface supply or a private well, as treatment needs vary accordingly.
Water Testing Results for Your Household
To select appropriate treatment, obtain a current, certified laboratory test specifically for bacteria from your home's water source. This is essential because regional data reflect averages and extremes, not your specific water.
Current Treatment Processes on Record
The Duluth system uses multiple treatment steps, indicated by EPA codes, aimed at managing biological and chemical water quality. Knowing these can help you understand the baseline treatment your water has already received.
Seasonal and Multi-Year Variation in Local Bacteria Records
Sampling Dates and Frequency
Water quality data come from repeated samples over years, capturing variations influenced by weather, surface water conditions, and operational changes in the treatment system.
Implications of Variation
Fluctuations in bacteria detections highlight why ongoing testing is necessary. A single test or isolated data point does not define your water quality long-term.
How the Documented Technology Addresses Bacteria in Household Water
Function of the Autotrol Bacteria & Coliform (Well) Filter
This system is designed to reduce bacteria and coliform organisms by filtering water directly at the point of household supply. It uses proven filtration technology that physically removes these microorganisms to improve water safety and quality.
Compatibility and Configuration
The filter ships ready to configure, allowing household users to integrate it with existing water lines without specialized outside assistance, providing a convenient solution for bacterial reduction.
What Bacteria ‘Detected’, ‘Median’, and ‘Range’ Mean in This System’s Public Records
'Detected' Indicates Presence but Not Extent
A detection means that test instruments found bacteria during sampling, but this does not automatically mean a health violation or unsafe water.
'Median' Reflects Typical Levels Found
The median is the middle value of detected levels across multiple samples, showing what is generally expected over time at the system level.
'Range' Shows Variability
The range covers the lowest to highest levels seen in testing and indicates how bacteria levels may fluctuate in the system.
What You Should Not Conclude from Regional Data Alone
Area-wide water system records provide useful background but cannot replace testing specific to your household’s water. Detection in public system data is not proof that your home’s water is contaminated or unsafe. Selecting treatment should be based on your own water testing results and needs. The Autotrol Bacteria & Coliform (Well) Filter offers a direct approach to managing bacterial concerns for residential water where tests confirm it is needed.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for Duluth (MN1690011), surface water supply, serving 86859 people: 1 health-based violations of 2 total; lead 90th percentile 0.008 mg/L