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        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        watershed, outdated septic systems are one of the water quality concerns.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 
        Mile Creek.   | 
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Residential 
        septic system diagram  | 
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        Bacteria levels are generally moderate to high throughout the summer and 
        can pose a public heath risk.  | 
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