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S 661

An Act relative to setting NDMA levels

194th Legislature (2025-2026) Introduced by Bruce Tarr

Massachusetts bill establishing enforceable NDMA contamination limits in water supplies to protect public health and require utility compliance with testing and treatment standards.

Accompanied a study order, see S2728
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Bill Summary · S 661

Legislative bill overview

S 661 establishes regulatory standards for NDMA (N-nitrosodimethylamine), a probable carcinogen, in Massachusetts water supplies. The bill addresses contamination concerns by setting maximum contaminant levels that water systems must meet and maintain.

Why is this important

NDMA contamination has been detected in water supplies across Massachusetts and nationwide, posing potential health risks with long-term exposure. Setting enforceable limits creates baseline protection standards and requires water utilities to monitor, report, and remediate contamination, affecting public health and water system operations.

Potential points of contention

  • Compliance costs: Water utilities may face substantial expenses for testing infrastructure, treatment upgrades, and operational changes to meet new NDMA standards
  • Standard-setting specificity: Debate over what NDMA level is appropriately protective versus economically feasible, and whether Massachusetts should align with federal EPA standards or set stricter limits
  • Implementation timeline: Whether utilities receive adequate time and resources to achieve compliance, particularly smaller municipal systems with limited budgets

Compiled from official sources — confirm details with the bill’s official record.

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