Related — A fishy situation: Mississippi, Lake Elmo flagged for perfluorochemicals

“State health officials are urging anglers not to eat fish they catch in two popular Twin Cities lakes, citing new evidence about a chemical contaminant found in fish that led the agency to cut the standard considered safe for consumption.

The Minnesota Department of Health on Thursday cautioned people against eating any fish caught from Lake Elmo in the east metro or any largemouth bass from Lake Harriet in Minneapolis, pointing the finger at perfluorooctane sulfonate, or PFOS.

‘In some studies, higher levels of PFOS in a person’s body have been associated with higher cholesterol, changes to liver function, changes in thyroid hormone levels and reduced immune response,” the agency said. “Based on updated scientific evidence and risk assessment for PFOS, MDH last month changed the level at which it begins to advise to not eat the fish at all — from 800 ng/g (nanograms per gram) to 200 ng/g — adding greater health protection.’

Lowering that threshold led to the warnings about Lake Elmo and Lake Harriet. The agency said several other Twin Cities waters — Bde Maka Ska (formerly Calhoun), Lake of the Isles, Johanna and Twin, as well as the Mississippi River between the Ford Dam and the lock and dam at Hastings — are getting additional guidance about the contamination.

Given the potential health effects of long-term exposure at elevated levels, the new guidance applies to everyone, not just higher risk populations, Assistant Health Commissioner Paul Allwood said in a statement…

State health and pollution control officials believe the most likely source of the elevated levels of PFOS in Lake Elmo is surface and groundwater contaminated by the former 3M disposal site in Oakdale. They said the recent 3M settlement will ‘allow further investigation and action as warranted to reduce the contamination.’ ”

Read the full article from MPR News