Public water systems sample for many different water quality indicators, also known as parameters, every day to help ensure the safety of your drinking water. The data shown in the tables below helps the City of Flint make decisions about the best way to treat the water. If more than one sample is collected per day at a particular location, the average or range of all daily samples may be shown.

This table shows water quality data for the GCDC system. The City of Flint will use this data to make treatment decisions when the GCDC is supplying water to the City of Flint. Visit Michigan.gov/FlintWater for more information.

The City of Flint purchases treated water from the Great Lakes Water Authority (GLWA) and the Genesee County Drain Commissioner (GCDC) and provides further treatment to optimize corrosion control.

• Data collected from the City's distribution system helps us know whether the treatment process is working correctly
• Some data in the table is informational only
• Some data shows whether target ranges for pH, orthophosphate, chlorine, and iron are being met.

Other testing that EGLE is doing for the City of Flint is Lead and Copper Sequential Sampling.

The four categories shown on the previous page (pH, Orthophosphate, Iron, and Chlorine) are main indicators of whether the City's corrosion control treatment is working properly. In 2017 EGLE set required ranges for pH and orthophosphate. An expanded dataset is available.

Visit Michigan.gov/FlintWater for more information.

The City of Flint purchases treated water from the Great Lakes Water Authority (GLWA) and the Genesee County Drain Commissioner (GCDC) and provides further treatment to optimize corrosion control.

• Data collected from the City's distribution system helps us know whether the treatment process is working correctly
• Some data in the table is informational only
• Some data shows whether target ranges for pH, orthophosphate, chlorine, and iron are being met.

Other testing that EGLE is doing for the City of Flint is Lead and Copper Sequential Sampling.

This expanded dataset helps the City of Flint make decisions about the best way to treat the water. If more than one sample is collected per day at a particular location, the average or range of all daily samples may be shown.

Visit Michigan.gov/FlintWater for more information.

Public water systems sample for many different water quality indicators, also known as parameters, every day to help ensure the safety of your drinking water. The data shown in the tables below helps the City of Flint make decisions about the best way to treat the water. If more than one sample is collected per day at a particular location, the average or range of all daily samples may be shown.

This table shows water quality data for the GLWA water system. The City will use this data to make treatment decisions when the GLWA is supplying water to the City of Flint.

For more information, visit Michigan.gov/FlintWater