Lead in Door County groundwater is attached to small particles, which can be filtered out to remove the lead

This 1994 study looked for lead, finding it in Door County wells which received water from zones of high hydraulic connectivity. Hydraulic connectivity refers to how easily water moves; with more-fractured bedrock having greater connectivity.

A link: https://koreascience.kr/article/JAKO199423034628066.pdf

Other posts about pollution:
https://doorcounty.substack.com/t/pollution