Can you treat a well with hydrogen peroxide?

Peroxide's home turf is continuous odor treatment, not a one-time treatment: injection systems feed it constantly to oxidize sulfur smells. As a treatment it is a poor fit for a drinking water well. The 3% bottle from the pharmacy is far too weak to matter, and the concentrated grades that could work are hazardous to handle and are not labeled for disinfecting a potable well. Use a product labeled for the job.

Treating a well with a disinfectant is also called shock chlorination.

The labeled options are chlorine, dosed at 50 to 200 ppm per extension guidance, or chlorine dioxide, dosed at 20 ppm per its manufacturer's published range. Both carry actual use directions for potable wells, which is exactly what a homemade peroxide dose lacks.

If a persistent sulfur smell is what pushed you toward peroxide, treat the source instead: the bacteria making the gas live in biofilm, and a properly sized treatment reaches them where they live.

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