From Lake Safety Director Steve Bischof regarding these test results: E Coli look excellent everywhere but south cove. The 175 levels in S Cove is the highest I’ve seen to date, but that said, the ducks & geese significantly congregate there.  Also the heavy usage on July 4 & 5 may have contributed to these values (Per Bob Craycraft @ UNH) . That said, even they are below the 400 for recreational use per DES.  The private beach (not a designated swimming area) may need to re-tested.

From NH Depatment of Environmental Services: The acceptable level of E. coli is determined by risk analysis based on statistics to protect human health. Drinking water should have no E. coli after treatment. E. coli levels at designated swimming beaches should not exceed 88 per 100 milliliter (mL) in any one sample, or exceed a three-sample geometric mean average over a 60-day period of 47/100 mL. Recreational waters that are not designated beaches should not have more than 406 E. coli/100 mL in any one sample, or more than 126/100 mL in a 60-day, three-sample geometric mean average. Occasional higher numbers are not unusual, particularly after storm events and where urban or agricultural runoff occurs. These levels are generally not considered unsafe unless investigation indicates the source to be sewage.