The Clam River in Sandisfield, MA

Postings of the E.coli levels will let you know more about the status of the river. The numbers in the chart below indicate a sample. The duplicates show you that 2 samples taken at the same time from the same location can have a very different measured level. Remember a sample is just that, a sample. At the end of the year the FRWA can calculate a geometric mean. Right now you can see how the numbers change depending on factors such as heavy rain increasing pollutant runoff, etc. Click here to see the FRWA’s Water Quality Map and for photos of the sites.

E. coli is not considered safe in drinking water at any levels; however the current standards for recreational use levels of E.coli are posted by the Massachusetts Environmental Public Health Tracking and used for their designated swimming areas. Use this as a guide for understanding the numbers in the chart below.

RecreationGeometric MeanSingle Sample Maximum
Designated Swimmingless than 126/100ml235/100ml

2021 E.coli Chart

OTIS

SITE NUMBERSTREAM NAMECOLLECTION DATEE.COLI COLONIES/100 ML
WBFR-15577-OtisWest Branch Farmington River6/7/202143
WBFR-15577-OtisWest Branch Farmington River6/21/202137
WBFR-15577-OtisWest Branch Farmington River7/12/2021687
WBFR-15577-OtisWest Branch Farmington River7/26/202146
WBFR-15577-OtisWest Branch Farmington River8/9/202123
WBFR-15577-OtisWest Branch Farmington River8/25/2021135
WBFR-15577-OtisWest Branch Farmington River9/1/202178
WBFR-19312-OtisWest Branch Farmington River6/7/202115
WBFR-19312-OtisWest Branch Farmington River6/21/202115
WBFR-19312-OtisWest Branch Farmington River7/12/2021961
WBFR-19312-OtisWest Branch Farmington River7/26/202120
WBFR-19312-OtisWest Branch Farmington River8/9/20216
WBFR-19312-OtisWest Branch Farmington River8/25/202179
WBFR-19312-OtisWest Branch Farmington River9/1/202151
Thom-140-OtisThomas Brook6/7/20214
Thom-140-OtisThomas Brook6/21/20216
Thom-140-OtisThomas Brook7/12/2021172
Thom-140-OtisThomas Brook7/26/202174
Thom-140-OtisThomas Brook8/9/20216
Thom-140-OtisThomas Brook8/25/202129
Thom-140-OtisThomas Brook9/1/202111
Shal-716-OtisShales Brook6/7/202188
Shal-716-OtisShales Brook6/21/202193
Shal-716-OtisShales Brook7/12/2021727
Shal-716-OtisShales Brook7/26/202135
Shal-716-OtisShales Brook8/25/202128
Shal-716-OtisShales Brook9/1/2021138
WBFR-20220- OtisWest Branch Farmington River6/7/202114
WBFR-20220- OtisWest Branch Farmington River6/21/202128
WBFR-20220- OtisWest Branch Farmington River7/12/2021410
WBFR-20220- OtisWest Branch Farmington River7/26/202116
WBFR-20220- OtisWest Branch Farmington River8/9/202115
WBFR-20220- OtisWest Branch Farmington River8/25/202174
Mine-37-OtisMiner Brook6/7/202140
Mine-37-OtisMiner Brook6/21/20215
Mine-37-OtisMiner Brook7/12/20211986
Mine-37-OtisMiner Brook7/26/202128
Mine-37-OtisMiner Brook8/9/202116
Mine-37-OtisMiner Brook8/25/202161
Mine-37-OtisMiner Brook9/1/202152
Fall-160-OtisFall River6/7/202114
Fall-160-OtisFall River6/21/20215
Fall-160-OtisFall River7/12/202149
Fall-160-OtisFall River7/26/202116
Fall-160-OtisFall River8/9/20215
Fall-160-OtisFall River8/25/202113
Unna-51-OtisUnnamed tributary between Big Pond and Otis Reservoir6/7/202124
Unna-51-OtisUnnamed tributary between Big Pond and Otis Reservoir6/21/2021938
Unna-51-OtisUnnamed tributary between Big Pond and Otis Reservoir7/12/2021613
Unna-51-OtisUnnamed tributary between Big Pond and Otis Reservoir7/26/202117
Unna-51-OtisUnnamed tributary between Big Pond and Otis Reservoir8/9/202113
Unna-51-OtisUnnamed tributary between Big Pond and Otis Reservoir8/25/202176
Unna-186-OtisUnnamed tributary between Big Pond and Otis Reservoir6/7/202114
Unna-186-OtisUnnamed tributary between Big Pond and Otis Reservoir6/21/202112
Unna-186-OtisUnnamed tributary between Big Pond and Otis Reservoir7/12/2021461
Unna-186-OtisUnnamed tributary between Big Pond and Otis Reservoir7/26/202118
Unna-186-OtisUnnamed tributary between Big Pond and Otis Reservoir8/9/202113
Unna-186-OtisUnnamed tributary between Big Pond and Otis Reservoir8/25/202161

SANDISFIELD

SITE IDSTREAM NAMECOLLECTION DATEE.COLI COLONIES/100 ML
Bent-526-SandisfieldBenton Brook6/7/20211
Bent-526-SandisfieldBenton Brook6/21/20210
Bent-526-SandisfieldBenton Brook7/12/202162
Bent-526-SandisfieldBenton Brook7/26/20216
Bent-526-SandisfieldBenton Brook8/9/202113
Bent-526-SandisfieldBenton Brook8/25/2021205
Bent-526-SandisfieldBenton Brook9/1/202113
Sand-15350-SandisfieldSandy Brook 6/7/2021101
Sand-15350-SandisfieldSandy Brook 6/21/202187
Sand-15350-SandisfieldSandy Brook 7/12/2021649
Sand-15350-SandisfieldSandy Brook 7/26/202142
Sand-15350-SandisfieldSandy Brook 8/9/202140
Sand-15350-SandisfieldSandy Brook8/25/2021152
Sand-15350-SandisfieldSandy Brook9/1/202176
Buck-1030-SandisfieldBuck River6/7/202113
Buck-1030-SandisfieldBuck River6/21/202117
Buck-1030-SandisfieldBuck River7/12/20212419
Buck-1030-SandisfieldBuck River7/26/202134
Buck-1030-SandisfieldBuck River8/9/202110
Buck-1030-SandisfieldBuck River8/25/2021120
Buck-1030-SandisfieldBuck River9/1/202146
Silv-877-SandisfieldSilver Brook6/21/202117
Silv-877-SandisfieldSilver Brook7/12/20211299
Silv-877-SandisfieldSilver Brook7/26/20215
Silv-877-SandisfieldSilver Brook8/9/202132
Silv-877-SandisfieldSilver Brook8/25/2021326
Silv-877-SandisfieldSilver Brook9/1/202128
Clam-2000-SandisfieldClam River6/21/202113
Clam-2000-SandisfieldClam River7/12/20212419
Clam-2000-SandisfieldClam River7/26/202118
Clam-2000-SandisfieldClam River8/9/202116
Clam-2000-SandisfieldClam River8/25/2021147
Clam-2000-SandisfieldClam River9/1/202154
WBFR-5680-SandisfieldWest Branch Farmington River6/7/20218
WBFR-5680-SandisfieldWest Branch Farmington River6/21/20216
WBFR-5680-SandisfieldWest Branch Farmington River7/12/2021365
WBFR-5680-SandisfieldWest Branch Farmington River7/26/202121
WBFR-5680-SandisfieldWest Branch Farmington River8/9/202111
WBFR-5680-SandisfieldWest Branch Farmington River8/25/2021105
WBFR-5680-SandisfieldWest Branch Farmington River9/1/202140

TOLLAND

SITE IDSTREAM NAMECOLLECTION DATEE.COLI COLONIES/100 ML
WBFR-727-TollandWest Branch Farmington River6/7/202120
WBFR-727-TollandWest Branch Farmington River6/21/202112
WBFR-727-TollandWest Branch Farmington River7/12/20211203
WBFR-727-TollandWest Branch Farmington River7/26/202141
WBFR-727-TollandWest Branch Farmington River8/9/202124
WBFR-727-TollandWest Branch Farmington River8/25/202184
WBFR-727-TollandWest Branch Farmington River9/1/202173

GRANVILLE

SITE IDSTREAM NAMECOLLECTION DATEE.COLI COLONIES/100 ML
Hubb-1460-GranvilleHubbard River6/7/202114
Hubb-1460-GranvilleHubbard River6/21/20211
Hubb-1460-GranvilleHubbard River7/12/2021548
Hubb-1460-GranvilleHubbard River7/26/202170
Hubb-1460-GranvilleHubbard River8/9/202116
Hubb-1460-GranvilleHubbard River8/25/202186