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Clarifying What Madison's Water Data Can and Cannot Tell You

Data from the MADISON WATER UTILITY public water system covers the overall water quality for this groundwater source serving about 272,000 people. This record reflects system-wide sampling results and does not specify water quality in any individual household. Detected measurements in the system are not signals of safety issues by themselves but are measurements taken in the distribution network, with some parameters reflecting plumbing effects rather than source water alone. Knowing this distinction is essential before drawing conclusions about your own home's water.

Understanding Sampling Terms in the Madison Public Water System Record

What 'Detected' Means

'Detected' means a substance was measured anywhere in the system, using established instruments. Detection means the substance is present but does not automatically imply a health or safety concern.

What 'Median' and the '90th Percentile' Indicate

The median value represents the middle of the detected concentrations across multiple samples, showing what is typical in the sampled locations. For example, the lead 90th percentile reported is 0.0018 mg/L, which summarizes the higher end of lead levels found in water after it leaves the source, potentially affected by plumbing materials.

What 'Range' Signifies

The range indicates the spread from the lowest to the highest detected values, helping to understand variability across the distribution system but not confirming the levels in any single household.

Additional Questions Commercial or Industrial Users Consider

Water Volume and Variation

Large-scale users often analyze water quantity needs and potential fluctuations on a daily or seasonal basis to adjust treatment or storage.

Specific Regulatory Standards and Process Control

Commercial and industrial operations typically review compliance with specialized regulatory limits and often have in-house monitoring to rapidly detect changes or exceedances.

Impact on Equipment and Processes

These users assess water quality effects on machinery and product quality, requiring detailed constituent profiles beyond what residential customers regularly need.

Recommended Order to Narrow Down Your Household Water Quality Questions

1. Review the Public Water System's Health-Based Violation History

Madison Water Utility has two EPA health-based violations recorded recently. This is system-level information indicating the presence of regulatory attention but not necessarily reflecting current water safety at your tap.

2. Examine Your Home’s Plumbing Materials and Conditions

Since lead results can be influenced by pipes and fixtures, consider if your home has older plumbing that may contribute to lead levels independent of source water.

3. Arrange Certified Laboratory Testing of Your Tap Water

This is the definitive step to establish if your household water meets safety expectations, specifically testing lead and other points of concern identified in system data.

How the Fleck Safe Drinking Water Filter Addresses Lead and Other Concerns

The Fleck Safe Drinking Water Filter ships ready to configure and uses proven filtration technologies to reduce lead levels and other potential contaminants that can originate from plumbing or residual sources. It provides an added layer of protection for households seeking to improve their tap water quality beyond what the public system guarantees.

Worked Example: Interpreting Madison's Lead 90th Percentile for Your Home

The reported lead 90th percentile of 0.0018 mg/L comes from sampling across many locations, reflecting water after it exits the treatment facility and travels through distribution lines. Because this measure is influenced by plumbing, your home's lead concentration could be lower or higher. Without a tap water test, the system-level data informs general risks but not your specific water condition.

Conclusion: The Essential Test for Your Household Water

Order a certified lead test for your home’s tap water. If the lead concentration is at or below EPA’s action level, this indicates compliance at your location and reduces concerns. If not, filtration solutions like the Fleck Safe Drinking Water Filter can be considered to improve water quality effectively.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2023-09-30. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA SDWIS record for MADISON WATER UTILITY (WI1130224), groundwater supply, serving 272000 people: 2 health-based violations of 4 total; lead 90th percentile 0.0018 mg/L