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Thunder Bay's water authority maintains that its drinking water system meets provincial safety standards while evaluating lead corrosion mitigation measures. The recent annual report indicates approximately 8,000 privately-owned and 5,500 publicly-owned lead service connections.

The city previously attempted to use sodium hydroxide to reduce acidity but ceased in 2020 after copper pipes leaked. Currently, free water filters are provided to residents and this program has been extended through 2026.

The city offers loans for lead pipe replacements and replaced 107 municipally-owned lead services last year. A financial plan includes a $25 million investment for the next 20 years aimed at replacing lead services.