Orange or Black Stains From Well Water
Orange, brown or black stains usually mean iron or manganese. How to confirm it, what levels matter, and treatment costs.
Orange and brown: iron. Black: manganese.
EPA's secondary standards, which cover staining, taste and odor rather than health, are 0.3 mg/L for iron and 0.05 mg/L for manganese. Above those levels, laundry, tubs and fixtures stain, and water can taste metallic.
How common is it?
Very. In Johnston County, North Carolina, State Laboratory results show iron above the EPA secondary level in 476 of 1,458 tested wells (NC DHHS). Our county pages list local results for North Carolina and Florida.
Rule out iron bacteria
Red-brown slime in the toilet tank, a musty smell or stains that come and go point to iron bacteria. Florida DOH says iron bacteria are not known to cause disease, but they stain, cause odors and can reduce how much water the well produces. Shock chlorination comes before any filter.
Test, then treat
Order an inorganic panel that reports iron, manganese and pH; county programs such as Wake County's include all three. Low pH changes the answer: many iron filter media need a pH near neutral, so acidic water gets a neutralizer first. HomeGuide lists installed iron or manganese filters at $1,000 to $3,500 and calcite neutralizers at $800 to $2,500 (cited as text). A softener alone handles only small amounts of iron.
Sources
EPA, Secondary Drinking Water Standards; NC DHHS, Well Water and Health: Johnston County; Florida DOH, Well water facts: odor and staining; Wake County, Well water testing; HomeGuide, Well Water Filtration System Cost (Apr 24, 2026, cited as text).
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