Although there are many sources of excess nutrients and bacteria in the
watershed, outdated septic systems are one of the water quality concerns.
The majority of homes in the watershed could have failing septic systems
(residential location map). Of the homes
on the residential location map, Nicollet County Environmental Services
staff estimate that approximately 70% of the homes could potentially be
discharging sewage into tiles, drainage ditches, and eventually Seven
Residential septic system diagram
Bacteria levels are generally moderate to high throughout the summer and can pose a public heath risk.
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