Flint Water System Progress Robert Kaplan USEPA Region

Flint Water System Progress Robert Kaplan USEPA – Region 5 April 8, 2016 U. S. Environmental Protection Agency 1

The drinking water system is recovering, but is unstable. • Orthophosphate coating is forming on pipes where enough water is flowing through the pipes • Levels of lead dissolved in the water appear to be declining • Still problem of random small particles of lead in the pipes, additional evaluation is ongoing Flint residents can safely drink filtered water. • EPA and Virginia Tech testing has shown the filters are effective even at very high levels • Filters need to be maintained, with cartridges replaced regularly • Only run cold water through the filters We need your help - Residents need to run the water in their homes and businesses. • To help build the protective orthophosphate coating • To help distribute the chlorine, which protects against microbes • Flushing the pipes will help clean the sediment out U. S. Environmental Protection Agency 2

Drinking Water System Improving Chlorine U. S. Environmental Protection Agency 3

Drinking Water System Improving Orthophosphate U. S. Environmental Protection Agency 4

U. S. Environmental Protection Agency DS 03 g S 15 g S 14 g S 13 g S 12 g S 11 g S 10 g S 09 g S 08 g 0 S 07 g Site AT S 06 g 50 S 05 g 100 S 04 g 200 S 03 g 250 S 02 g 150 (ppb) 300 S 01 g DS 03 at S 14 at S 13 at S 12 at S 11 at S 10 at S 09 at S 08 at S 07 at S 06 at S 05 at S 04 at S 03 at S 02 at S 01 at (ppb) Particulate Lead – Random from House to House Site G 8 7 6 5 4 3 2 1 0 5

Filters Work U. S. Environmental Protection Agency 6