If government sampling reports lead detected, what does that mean?
The Green Bay Waterworks system’s 2023 data shows a 90th percentile lead level of 0.0025 mg/L based on distribution system sampling. This figure reflects lead measured at the tap in homes across the system rather than in the source surface water. The 90th percentile represents a level below which 90% of samples fall, capturing a range of variation in plumbing and usage conditions. Detection means instruments measured lead but does not imply a violation or unsafe water, especially since the system has no EPA health-based violations on record.
If you want to compare Green Bay’s lead findings with another county, how should you do it?
Comparing lead levels across counties requires looking at similar public water system data and understanding the context. Neighboring counties may have different water sources, treatment methods, and infrastructure that affect lead measures. Differences in sampling dates or population sizes served also influence results. Avoid assuming your home's water exactly matches the regional data—local plumbing and individual testing are necessary for specific conclusions.
If you are weighing equipment by household water use, what matters for lead treatment?
When selecting lead reduction equipment, consider your household’s daily water demand alongside the system’s rated capacity. Treatment technology must handle peak and average consumption to ensure effective lead removal. Overestimating capacity can cause reduced performance, while underestimating may add unnecessary expense. Equipment like the Pentair Lead in Water Filter ships ready to configure for typical residential volumes and can accommodate adjustments based on usage patterns.
If your home’s plumbing is older or made with certain materials, how does that impact lead concerns?
Lead in drinking water often comes from corrosion of household plumbing rather than the source water itself, especially when the water system maintains compliance with health-based standards. Older homes or those with brass fixtures, lead solder, or lead pipes may see higher lead levels at the tap. Testing your own water is the only way to confirm if plumbing material affects your lead concentration, regardless of what government data shows for the public water system.
If lead’s aesthetic standards differ from health limits, why is that important?
Lead levels that affect taste, staining, or corrosion are governed by secondary aesthetic standards, which are distinct from health-based limits established by the EPA. The Green Bay system record shows no health-based violations, indicating lead levels are within regulated safety margins. Understanding this difference helps clarify that detectable lead does not necessarily mean a health risk but may motivate treatment to improve water quality and reduce exposure over time.
What you should not conclude: The Green Bay public water system record reflects system-wide measurements, not individual home water quality. Detecting lead in the system data does not establish your water’s lead level, nor is it a violation or proof of unsafe water. Testing your household water is the only way to determine your need for lead treatment equipment. For effective reduction, products such as the Pentair Lead in Water Filter offer a documented solution designed to address lead concerns when configured to your household’s demand.
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 GREEN BAY WATERWORKS (WI4050356), surface water supply, serving 107369 people: 0 health-based violations of 4 total; lead 90th percentile 0.0025 mg/L