Well Water in Leelanau County: What to Test and Why

Low Risk
Informational — Low Risk Detected 126731 samples analyzed
Top Concerns in This County
Manganese Iron

Why This Happens Here

Your well water comes from old limestone and related stone layers deep underground. These rocks hold water in cracks and spaces between the minerals. Water moves slowly through these layers, picking up minerals as it goes.

Iron and manganese come naturally from the rock itself. As groundwater sits in contact with the stone, these metals dissolve into the water. Arsenic also occurs naturally in these rock layers. The geology here does not protect against these metals the way some other areas are protected.

Your water is extremely hard and contains high levels of sodium and sulfate. The hardness means white crusty buildup will form on faucets, pipes, and appliances. Iron will stain sinks and laundry orange-brown, and the water may taste metallic or bitter from the sulfate. Testing your well is the first step to deciding what treatment you need.

What This Means for You

Iron and manganese in Leelanau County wells exceed EPA health standards. Arsenic is also a contaminant of concern in the area. Your well needs testing to know what you are dealing with. The good news is that the urgency level for this area is low.

Iron causes orange-brown staining on sinks, laundry, and fixtures. The extremely high hardness and sulfate levels mean scale builds up on pipes and appliances, making them work harder and wear out faster. Your water may also taste bitter or metallic. These quality-of-life problems happen because groundwater moves slowly through mineral-rich rock layers under Leelanau County.

Get your well tested by a state-certified lab right away. A basic health screen for bacteria and nitrate costs fifty to one hundred dollars. A full mineral and metals panel runs two hundred to four hundred dollars. An iron filter can remove staining and improve water quality.

Contaminant Detection Data

Contaminant Samples % Above MCL Distribution Confidence Risk
Manganese 3 50% 67% · 0% · 33% Low High
Iron 4 33% 75% · 0% · 25% Low High
Fluoride 8 0% 100% · 0% · 0% Low Low
Sulfate 43 0% 98% · 2% · 0% Moderate Low
Arsenic 5 0% 100% · 0% · 0% Low Low
Chloride 36 0% 97% · 3% · 0% Moderate Low
Uranium 4 0% 100% · 0% · 0% Low Low
Nitrate 17 Moderate Low
Hardness 2 Low Low
Sodium 33 Moderate Low
pH 62 Moderate Low
E. coli 1 0% 100% · 0% · 0% Low Safe
Nitrite 1 0% 100% · 0% · 0% Low Safe
Fecal Coliform 1 Low Safe
Nitrate 1 0% 100% · 0% · 0% Low Safe
Lead 1 0% 100% · 0% · 0% Low Safe

MCL = Maximum Contaminant Level (EPA limit for public water; used as benchmark for private wells). Distribution shows % of sampled wells in each concentration band. Methodology.

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