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City reports improved lake levels, outlines algae-monitoring steps and temporary treatment costs
Summary
City staff briefed the council on lake levels, microcystin and MIB monitoring, use of powdered activated carbon this spring, and plans for a permanent PAC system and granular-activated carbon changeouts.
The Bloomington City Council received an update Aug. 25 on the city's drinking-water sources and treatment actions as staff outlined monitoring results for taste-and-odor compounds and the harmful-algae indicator microcystin. City staff said Lake Bloomington and Lake Evergreen have largely rebounded from last year's deficits and that staff are preparing treatment and monitoring plans for the coming seasons. "Lake Evergreen is just slightly down by 0.23 feet and Lake Bloomington is 0.87 feet," a city water director told the council.
The director said the city uses 10 nanograms per liter (ng/L) as a practical threshold for finished-water taste-and-odor complaints and that raw-water concentrations can be much higher. Lake Evergreen raw MIB (an odorous compound) recently measured about 270 ng/L; the director said with current treatment options the plant…
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