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Wisconsin lead service line map

The 1,903 community and non-transient non-community water systems in the EPA Service Line Inventory (SDWIS Federal Reports) for Wisconsin, each with a trigger score for lead service line replacement pressure: a 0–100 prioritisation index built from published records (line counts, funding signals and deadline timing), not a prediction that any system will start a project. Hover, tap or tab to a system for its trigger score, its lines and what the state's SRF list says about it.
State list used: Wisconsin DNR SDWLP SFY2027 Project Priority List and lead service line Intent To Apply list (both 15 May 2026). 428 of 448 list projects matched to a system on this map, by sponsor name. Wisconsin keeps lead service line projects off its main priority list; its separate lead service line Intent To Apply list is read too. An intent to apply is not an application or an award, and the SFY2027 lead service line funding list was not yet published.
1,903systems scored75lead or galvanized line replacement candidates339,528lines to replace or investigate308with a health-based violation since 2024225matched to the state SRF list, any project type72 of them report no lead, galvanized or unknown lines
County shading = replacement pool (lead + galvanized-requiring-replacement + unknown-material lines). Dots = the top 250 systems by trigger score, placed inside the county they serve (SDWIS publishes no coordinates), so position within a county is approximate and systems in one county overlap. Green ring = matched to the state SRF list for any project type.
How the trigger score works

Regulatory pressure (0–40): lead and galvanized-requiring-replacement line counts and unknown-material line counts. A latest lead action-level exceedance would add 6; it is not assessed in this snapshot, so the regulatory score can reach at most 34 here.

On the state SRF list, any project type (0–15): named on the state's project list for any project, lead related or not (+10); principal forgiveness or eligibility (+5), not scored for this list because no forgiveness information was read from it; listed projects totalling $1M or more (+5). The +5 for an active project cannot be scored: this list does not state project status. Each card shows what the list says about the project.

Deadline proximity (0–25): days to the 1 November 2027 baseline lead service line inventory deadline. Every system gets 15 points in this snapshot.

Recent change (0–10): needs a change history; every system scores 0 in this snapshot.

The trigger score is a prioritisation index built from published records, not a prediction. It does not say that a listed project is lead related.