Sampling Depth and Source Type Impact on Water Characteristics
Surface Water as a Primary Supply
The Duluth public water system in St. Louis County draws water from surface sources. This influences water quality characteristics that differ from ground water sources such as wells.
Effect of Distribution System on Lead Levels
Lead measurements reported reflect plumbing and distribution conditions, not the source water itself. The 90th percentile lead level was 0.008 mg/L as of 2025-12-31, specific to the system's water after treatment.
Routine Care for the Pentair City Whole-Home Protection System
Regular Media Replacement Cycle
This system offers 32,000 grain capacity and requires scheduled media replacement to maintain performance, based on household water usage.
System Monitoring and Filter Servicing
Users are advised to monitor water quality indicators and replace filter components as recommended to sustain treatment effectiveness.
Understanding Aesthetic Standards Versus Health-Based Limits
Distinguishing Secondary From Primary Standards
Water constituents that affect taste, staining, and corrosivity are governed by aesthetic secondary standards. These differ from health-based limits, which address safety concerns.
Clarifying Detected Levels and Their Implications
Detection of substances in the system does not imply unsafe water. For example, aesthetic thresholds guide water quality for comfort rather than health risk.
Recognizing Signs Related and Unrelated to Water Quality Issues
Common Household Symptoms That May Indicate Treatment Needs
Staining, unusual taste, or scaling can point to aesthetic issues in water supply, making treatment options worth considering.
Symptoms Not Necessarily Linked to Water Supply Quality
Leaks, low water pressure, or appliance faults typically are unrelated to water quality and should be investigated separately.
Interpretation of Water System Measurements in Context
Health-Based Violation Record and Its Meaning
The Duluth system has one EPA health-based violation on record among two total, indicating specific aspects of compliance monitoring in the system but does not denote general water safety for consumers.
Scope of Public Water System Data
These measurements reflect the overall public water system performance serving approximately 86,859 people across 28,850 connections in St. Louis County.
Understanding these factors helps in making an informed choice between different city water treatment technologies available. The Pentair City Whole-Home Protection System ships ready to configure and can address common household water quality concerns documented in this system.
This summary is based on government records from the EPA Safe Drinking Water Information System (SDWIS) public water system data for MN1690011, Duluth, St. Louis County, MN.
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
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