mercury permit limit exceedances in wastewater
Wastewater mercury levels going above allowed permit limits.
What to Watch
Future wastewater samples and any Wisconsin Department of Natural Resources response will determine whether further action is needed.
Coming Up
Typically discussed at Public Utilities Committee. Check back when the next agenda is published.
The Story
Two Rivers reported a wastewater mercury reading of 2.1 nanograms per liter, above its 1.3 permit limit. The next sample was 0.65, and continued testing is expected to show whether the higher result was isolated or recurring.
Record
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The wastewater plant reported a mercury result of 2.1 nanograms per liter to the Wisconsin Department of Natural Resources, exceeding its 1.3 nanograms-per-liter permit limit.
Public Utilities Committee -
Staff said the elevated result may have been an outlier tied to sediment flushed during water-plant tank cleaning and heavy rain; the next mercury sample measured 0.65 nanograms per liter.
Public Utilities Committee -
The committee discussed continued sampling to determine whether the permit exceedance was isolated or recurring.
Public Utilities Committee