Orthophosphate Dosing

What is Orthophosphate Dosing?

Water utility companies started using Orthophosphate dosing as a way to reduce plumbosolvency (the ability to dissolve lead) and lead corrosion in public piping systems. Water traveling through metal pipes dissolves lead and other hard metals found in the pipes themselves, solder, and fittings.

For many years, phosphate dosing has been seen as a costeffective method for controlling plumbosolvency in drinking water supplies. If optimized and controlled, the orthophosphate dosing can reduce the levels of lead in many (but not all) water supply systems to less than the allowable limits.

Problems with Orthophosphate Dosing

Even though dosing has been shown to reduce lead levels in most lead piping systems to meet health requirements, many question its validity as a long term solution. There are concerns regarding its future availability, cost, and its long term effects on the environment.

The optimized dose of orthophosphate varies from system to system. Many factors including water type (surfacederived vs. groundwater), pH, alkalinity and temperature.

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