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Massachusetts lead service line map

The 771 community and non-transient non-community water systems in the EPA Service Line Inventory (SDWIS Federal Reports) for Massachusetts, 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: MassDEP 2026 Drinking Water SRF project priority list (tables 3 and 4) and the Clean Water Trust's current lead service line loans (October 2025). 76 of 76 list projects matched to a system on this map, by PWSID. MassDEP's 2026 list names no lead service line project by system: lead line work is financed from a statewide set-aside of $103,391,514 (2026 Final IUP, Table 1). The lead flags come from the Clean Water Trust's list of current lead service line construction loans (October 2025), which are awards already made, not 2026 applications.
771systems scored46lead or galvanized line replacement candidates391,709lines to replace or investigate44with a health-based violation since 202462on the state SRF list, any project type15 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 = on 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.