Well Water in Alpena County, Michigan

Alpena County · Population ~29,000 · Aquifer: Glacial Drift / Devonian Limestone

Hardness: 300-600+ PPM — Very Hard to Extremely Hard

Alpena County and the broader Northeast Michigan region sit on a geology distinct from the rest of the state: glacial drift over Devonian-age limestone bedrock. This produces some of the hardest water in Michigan, along with naturally occurring arsenic at concentrations that frequently exceed EPA limits. The area also has the characteristic hydrogen sulfide (rotten egg smell) that comes from certain limestone formations.

Arsenic: The Primary Health Concern

Northeast Michigan — Alpena, Presque Isle, Alcona, and surrounding counties — has some of the highest naturally occurring arsenic concentrations in the state. The USGS has documented that wells in this region frequently exceed the EPA's 10 ppb maximum contaminant level.

The arsenic comes from the interaction between glacial deposits and the underlying Devonian-age bedrock. Certain geological conditions in this region concentrate arsenic in groundwater at levels that are among the highest in the Great Lakes region.

Every well in Alpena County should be tested for arsenic. No exceptions. See our arsenic guide.

Extremely Hard Water

The limestone bedrock beneath Alpena County dissolves readily, producing water with 300 to 600+ PPM hardness — among the hardest in Michigan. At these levels, scale buildup is severe and rapid. Expect to replace water heaters more frequently and budget for ongoing water softener maintenance.

Hydrogen Sulfide (Rotten Egg Smell)

Many Alpena County wells produce water with a distinct rotten egg odor — that's hydrogen sulfide gas, produced by bacteria in the limestone aquifer or by chemical reactions between the water and sulfur-containing minerals in the rock.

While low concentrations of hydrogen sulfide are mainly a nuisance (the smell is awful), higher concentrations can corrode pipes and affect the taste of food and beverages. Aeration systems or oxidation filters can treat it effectively.

Testing Priorities

Arsenic testing is non-negotiable in Alpena County. Beyond that, test annually for bacteria, nitrates, and pH. Test at least once for hardness, iron, manganese, sulfate, and hydrogen sulfide.

See our testing guide for certified labs and costs.

Every well is different. Two wells on the same street can produce completely different water. The data on this page reflects documented conditions in the Alpena County area, but the only way to know what's in your water is to test it.

Sources

  • USGS — Arsenic in Glacial Drift and Bedrock Aquifers, Northeast Michigan
  • Michigan EGLE — Wellogic Database, Alpena County Extract
  • Alpena County Health Department — Environmental Health Division
  • Michigan Geological Survey — Devonian Limestone Aquifer Characterization