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-19312-OtisWest Branch Farmington River6/7/202115
WBFR-19312-OtisWest Branch Farmington River6/21/202115
WBFR-19312-Otis Lab SplitWest Branch Farmington River6/21/202115
WBFR-19312-OtisWest Branch Farmington River7/12/2021961
Thom-140-OtisThomas Brook6/7/20214
Thom-140-OtisThomas Brook6/21/20216
Thom-140-OtisThomas Brook7/12/2021172
Shal-716-OtisShales Brook6/7/202188
Shal-716-OtisShales Brook6/21/202193
Shal-716-OtisShales Brook7/12/2021727
WBFR-20220- OtisWest Branch Farmington River6/7/202114
WBFR-20220- OtisWest Branch Farmington River6/21/202128
WBFR-20220- OtisWest Branch Farmington River7/12/2021410
Mine-37-OtisMiner Brook6/7/202140
Mine-37-Otis DupMiner Brook6/7/202143
Mine-37-OtisMiner Brook6/21/20215
Mine-37-OtisMiner Brook7/12/20211986
Fall-160-OtisFall River6/7/202114
Fall-160-OtisFall River6/21/20215
Fall-160-OtisFall River7/12/202149
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-Otis DupUnnamed tributary between Big Pond and Otis Reservoir7/12/20211553
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

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
Sand-15350-SandisfieldSandy Brook 6/7/2021101
Sand-15350-SandisfieldSandy Brook 6/21/202187
Sand-15350-SandisfieldSandy Brook 7/12/2021649
Buck-1030-SandisfieldBuck River6/7/202113
Buck-1030-SandisfieldBuck River6/21/202117
Buck-1030-SandisfieldBuck River7/12/20212419
Silv-877-SandisfieldSilver Brook6/21/202117
Silv-877-SandisfieldSilver Brook7/12/20211299
Clam-2000-SandisfieldClam River6/21/202113
Clam-2000-SandisfieldClam River7/12/20212419
WBFR-5680-SandisfieldWest Branch Farmington River6/7/20218
WBFR-5680-SandisfieldWest Branch Farmington River6/21/20216
WBFR-5680-SandisfieldWest Branch Farmington River7/12/2021365

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

GRANVILLE

SITE IDSTREAM NAMECOLLECTION DATEE.COLI COLONIES/100 ML
Hubb-1460-GranvilleHubbard River6/7/202114
Hubb-1460-GranvilleHubbard River6/21/20211
Hubb-1460-Granville DupHubbard River6/21/20211
Hubb-1460-GranvilleHubbard River7/12/2021548
Hubb-1460-Granville Lab SplitHubbard River7/12/2021291