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In addition to removing all pipes and handing out filters, it also proposed an alternative water treatment method because the standard additive, orthophosphate, can harm waterways.

The next month, the state issued a permit for the city to pump orthophosphate and polyphosphate into the water to coat the pipes and prevent erosion.

Then, in May, officials added a new chemical to the water — orthophosphate — that has proved helpful at preventing leaching.

In about half of all American water companies, including the Detroit system, orthophosphates are added to the water at the treatment plant.

The Pittsburgh Tribune-Review reports the Pittsburgh Water and Sewer Authority will start adding orthophosphate to its water in August.