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Six-month monitoring results

Six-month monitoring results

Since July 2016, the city of Flint's water system has met state and federal standards for lead in drinking water for 15 consecutive monitoring periods. The latest six-month round of monitoring shows Flint's 90th percentile at 3 parts per billion (ppb), below the requirement of 15 ppb.

Flint has conducted excavations to determine service line material composition at approximately 98 percent of the residential locations.

Lead and copper rule monitoring results in Flint showing levels consistently below federal action levels since the second half of 2016 The latest six-month round of monitoring (January - December 2024) shows Flint's 90th percentile at 3 parts per billion (ppb), below the requirement of 15 ppb.

Lead and copper rule monitoring results in Flint, Michigan

Levels above 15 parts per billion (PPB) require action per federal standards. Latest results are highlighted in yellow.

 

Date range

Results (parts per billion [ppb])
July - December 2024 3 PPB**
January - June 2024 1 PPB**
July - December 2023 10 PPB**
January - June 2023 8 PPB*
July - December 2022 9 PPB**
January - June 2022 10 PPB**
July - December 2021 7 PPB**
January - June 2021 3 PPB**
July - December 2020 6 PPB**
January - June 2020*** 4 PPB**
July - December 2019*** 4 PPB**
January - June 2019 6 PPB**
July - December 2018 4 PPB*
January - June 2018 6 PPB*
July - December 2017 6 PPB*
January - June 2017 7 PPB*
July - December 2016 12 PPB*
January - June 2016 20 PPB*

* Represents the 90th percentile value for 1st draw 1 liter samples user for compliance (federal Lead and Copper Rule [LCR])
** Represents the 90th percentile value using the highest of either the 1st or the 5th liter sample results (new Michigan LCR)
*** During this monitoring period, the 90th percentile value was calculated using only 49 sites validated for compliance