DETROIT — Lead levels have fallen in Benton Harbor's drinking water in the latest half-year sampling, but are still at the federal action level, state officials in Michigan said Wednesday — a level that experts have said remains unsafe.
Water samples from 63 homes from August to November showed the 90th percentile was at 15 parts per billion, according to the Michigan Department of Environment, Great Lakes and Energy. The southwest Michigan city has exceeded the federal standard for three consecutive years, starting at 22 ppb in 2018 and 24 ppb in the last sampling for the first half of this year.
Public health experts have said no level of lead in drinking water is safe.
State and city officials treated Benton Harbor's drinking water with a corrosion chemical blend that failed to control harmful levels of lead for more than two years before the latest results.
The August-November samples showed that the results ranged from no lead detection to 48 ppb, which state officials described as a "significant reduction from high levels" found in previous sampling periods. Six samples, they added, still had more 15 ppb in the water tested.
"This is encouraging news, an indication that corrosion control treatment is taking hold and reducing the amount of lead getting into the water," said Eric Oswald, director of EGLE's Drinking Water and Environmental Health division, in a statement. "This does not lessen the urgency around our continuing efforts to assist the city in aggressively reducing lead exposure through lead service line replacement, corrosion control and working to overcome aging infrastructure challenges.
Benton Harbor has had three consecutive years of lead exceedances since 2018, which then triggered six-month rounds of testing to measure the lead in the drinking water in the impoverished city of nearly 10,000 residents.
Oswald said corrosion control treatment used in Benton Harbor is done by introducing phosphate into the water supply to coat the lead service lines and fixtures, which reduces the amount of lead that dissolves when water passes through those materials.
The corrosion control treatment had been criticized by environmentalists and water quality experts because the lead levels in Benton Harbor had been rising. It also was the subject of a scathing petition to the Environmental Protection Agency that criticized EGLE for not safeguarding the drinking water for residents or declaring an emergency.
The filing was followed by a pledge from Michigan Gov. Gretchen Whitmer's administration to spend millions of dollars to expedite lead pipe removals in hopes of lowering the lead levels faster.
The Detroit News reported last week that the consulting firm operating Benton Harbor's water treatment plant ordered additional water samples at homes in the first half of 2021 after lead testing through May showed the highest level of lead in three years in the city's drinking water.
The resampling reduced the initial result of 33 ppb to 24 ppb, a trajectory level from the previous six-month testing period.
"We appreciate the work of the experts at EGLE and the care that was taken in making sure the samples were collected the right way and that the tests were done properly," said Benton Harbor Mayor Marcus Muhammad in a statement. "We are making progress in our work and this instills more confidence in the process we are following."
