Manganese is a natural mineral common in groundwater. It is regulated mostly for staining and taste.
In Florida, Manganese was reported by 515 community water systems serving about 1,643,295 people. Every reported reading was at or below the federal legal limit.
The highest reading relative to the limit was at Otter Creek in Levy County, at 2800% of it.
Where it comes from: Erosion of natural deposits.
Enforceable. A utility must stay at or under this.
Health-based, not enforceable. Often lower than the limit, sometimes zero.
California has not published a PHG for this substance.
Health effects the EPA associates with it: Mainly an aesthetic issue: black or brown staining and a metallic taste. At much higher levels over long periods it can have neurological effects, which is why EPA also has a health advisory.
Water at or under the legal limit meets federal safety standards. A reading above a health goal is not the same as being unsafe, and health goals are set purely on health without regard to cost or treatability. Both are shown so the margin is visible either way.
Showing the 25 highest of 515 systems that reported Manganese.
These figures describe water as delivered by each utility, not what your home’s plumbing adds after it arrives. Informational; not a substitute for testing your own tap.