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SD 170

An Act relative to setting NDMA levels

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

Massachusetts bill establishing enforceable drinking water limits for NDMA carcinogen to protect public health and require water system compliance.

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Bill Summary · SD 170

Legislative bill overview

SD 170 addresses N-nitrosodimethylamine (NDMA), a probable human carcinogen, by establishing regulatory limits for this contaminant in Massachusetts drinking water and potentially other sources. The bill aims to protect public health by setting enforceable standards for NDMA detection and remediation in water supplies.

Why is this important

NDMA contamination has been detected in drinking water systems across Massachusetts and the nation, raising health concerns as the compound is classified as a probable carcinogen. Setting specific NDMA levels creates accountability for water providers, establishes clear compliance benchmarks, and triggers mandatory action when contamination exceeds safe thresholds—protecting residents from prolonged exposure to this chemical.

Potential points of contention

  • Compliance costs: Water treatment facilities may face substantial expenses upgrading infrastructure to meet new NDMA standards, potentially increasing consumer water bills
  • Standard-setting methodology: Disagreement may arise over what NDMA levels are truly "safe" and whether Massachusetts should adopt federal EPA recommendations or set more stringent state-specific limits
  • Scope of regulation: Unclear whether the bill covers only municipal water systems or extends to private wells, wastewater treatment, and industrial sources, affecting different stakeholders differently

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

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