Lead Water Information for Dane County Residences in Madison Area

Government water-quality data from the Madison Water Utility offers important insight into lead levels affecting the city's public water supply, but these figures characterize the entire system and do not specify conditions in any single home. This checklist explains key points about lead based on publicly available system records, clarifies common misunderstandings, and identifies what homeowners should track before considering treatment options such as the C-Series Lead in Water Filter.

1. Considerations for Large, Seasonal, or Secondary Residences

Lead Levels Can Vary Within a Household’s Plumbing

While the municipal system’s lead 90th percentile was 0.0018 mg/L in 2023, this value represents plumbing conditions across Madison’s connections, not your specific faucet or well.

Large Households May Experience Different Lead Exposure Patterns

Usage and water age in pipes can affect lead levels. Homes with many residents or extended usage may have different lead presence compared to single-person households.

Seasonal Homes May Have Stagnant Water Increasing Lead Uptake

Homes used seasonally might experience higher lead due to stagnant water in pipes; flushing lines before use is important.

2. Interpreting Lead Measurements Versus Federal Standards

The 90th Percentile Reflects Distribution, Not a Maximum Level

The reported 0.0018 mg/L lead figure means 90% of tested locations had this level or lower; it is not the highest detected value nor a direct measure at your tap.

Lead Data Does Not Indicate Source Water Concentration

The figure includes plumbing contributions and does not reflect lead concentrations in the groundwater source itself.

An EPA Health-Based Violation Indicates Past Compliance Issues

The Madison system has two recorded health-based violations among four overall, highlighting the importance of ongoing monitoring but not suggesting current tap water is unsafe without further test.

3. Differentiating Lead from Commonly Confused Water Concerns

Lead Is a Metal Concerned Primarily for Health, Not Aesthetics

Unlike discoloration or taste issues, lead presence relates to health risks and requires specific measurement and management.

Lead Detection Does Not Equate to Violation

Any detection in samples is a measured value, not automatically a water safety violation or unsafe condition.

Lead Issues Differ From Secondary Standards Like Staining or Corrosivity

Lead is regulated under health-based standards while other water parameters address taste and appearance separately.

4. How the C-Series Lead in Water Filter Addresses Lead

Specialized Filtration Targets Lead Particles

The C-Series System removes or neutralizes lead present in tap water to reduce exposure through drinking and cooking.

System Ships Ready to Configure Without Specialized Setup Services

No professional fitting is required; users can set up the system themselves according to provided instructions.

5. Information to Gather Before Seeking Treatment Advice

Have Your Specific Water Test Results Available

Only tests done on your own water source or tap can confirm actual lead levels affecting your household.

Document Household Use Patterns and Plumbing Age

This contextual information helps assess potential lead exposure and suitability of treatment options.

Note Any Past Water Quality Concerns or Notices

Keep records of water utility reports or advisories relevant to lead or other contaminants.

6. Why Aesthetic Secondary Standards Differ From Health-Based Lead Limits

Secondary Standards Govern Taste, Staining, and Corrosivity

These do not apply to lead, which is regulated based on health considerations, underscoring the importance of not confusing the two when evaluating water quality.

Lead Health-Based Limits Focus on Reducing Long-Term Exposure Risks

This distinction clarifies why lead measures in public records emphasize health risk monitoring.

In summary, the Madison Water Utility’s public system record covers water delivered broadly in Dane County’s Madison area through groundwater sources and reflects system-wide lead monitoring results. Individual households should obtain their own water tests to understand their specific condition. For more details, refer to the official EPA water system data for Madison Water Utility (WI1130224).

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