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Missouri lead service line map

The 1,662 community and non-transient non-community water systems in the EPA Service Line Inventory (SDWIS Federal Reports) for Missouri, 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: Missouri DNR FY2026 DWSRF project priority list (fundable and planning lists). 67 of 70 list projects matched to a system on this map, by sponsor name. Read: the FY2026 plan's fundable list, including its planning and design loans, and its planning list. The FY2027 list was not yet final when this was pulled.
1,662systems scored45lead or galvanized line replacement candidates961,029lines to replace or investigate147with a health-based violation since 202452matched to the state SRF list, any project type5 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 (0–20): named on the state's project list for any project, lead related or not (+10); principal forgiveness or eligibility (+5); 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.