Houghton County, Michigan: drinking water report. Houghton County in Michigan's Upper Peninsula has about 36,000 residents, including Houghton and Michigan…
Houghton County in Michigan's Upper Peninsula has about 36,000 residents, including Houghton and Michigan Technological University. The county sits on the Keweenaw Peninsula, the site of one of the largest copper mining operations in American history. From the 1840s through the 1960s, billions of pounds of copper were extracted from the region, and the mining waste – stamp sands, tailings, and mine water – transformed the landscape.
Copper mining left enormous quantities of stamp sand along the shoreline and in waterways throughout Houghton County. According to Michigan EGLE's 2024 assessment, the Torch Lake area alone contains over 200 million tons of copper mine tailings. While copper itself is regulated at a secondary standard of 1.0 mg/L, the stamp sands also contain arsenic, mercury, and other metals that concentrate in the fine sediment fraction.
Most drinking water comes from Lake Superior or deep bedrock wells that are insulated from the surface contamination. A 2024 EGLE survey found that public water systems in the county meet all standards. Private wells near abandoned mining sites, however, showed copper at 0.3-0.8 mg/L in some cases – not exceeding standards but well above background levels.
Houghton County's Lake Superior water supply is among the cleanest in the country. The mining legacy is primarily a surface and shallow groundwater issue. If you are on a private well near historic mining operations, testing for copper, arsenic, and other metals is worthwhile.
Check your water for available data. For mining-related metals, specific media filters and reverse osmosis are effective options. Our water filter guide covers systems for mineral-rich well water. Get your detailed report for local data, and visit our Michigan page for statewide patterns.