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 CT DEEP as follows. There are no “designated swimming” areas in the Lower Farmington River. Use this as a guide for understanding the numbers in the chart below.

Recreation Geometric Mean Single Sample Maximum
Designated Swimming less than 126/100ml 235/100ml
Non-designated Swimming less than 126/100ml 410/100ml
All Other Recreational Uses less than 126/100ml 576/100ml

 2021 E.coli Chart

AVON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
TB-A1Thompson Brook6/29/202136
TB-A1Thompson Brook7/20/202184
TB-A1Thompson Brook8/3/202119
TB-A1Thompson Brook8/17/202115
TB-A1Thompson Brook8/24/2021276
TB-A1Thompson Brook8/31/202150
NB-A1Nod Brook6/15/2021249
NB-A1Nod Brook6/29/2021121
NB-A1Nod Brook7/20/2021104
NB-A1Nod Brook8/3/2021111
NB-A1Nod Brook8/17/202175
NB-A1Nod Brook8/31/2021161

BURLINGTON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
BB-B1Bunnell Brook6/8/20214
BB-B1Bunnell Brook6/22/202141
BB-B1Bunnell Brook7/13/202145
BB-B1Bunnell Brook7/27/202127
BB-B1Bunnell Brook8/10/202115
BB-B1Bunnell Brook8/24/2021285

CANTON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
CB-C1Cherry Brook6/8/2021365
CB-C1Cherry Brook6/22/202174
CB-C1Cherry Brook7/13/2021150
CB-C1Cherry Brook7/27/202142
CB-C1Cherry Brook8/10/202181
CB-C1Cherry Brook8/24/2021613

EAST GRANBY

 Site NumberStream NameCollection DateE.coli colonies/100 mL
FR-EG1Farmington River6/8/202154
FR-EG1Farmington River6/22/202142
FR-EG1Farmington River7/13/2021361
FR-EG1Farmington River7/27/202153
FR-EG1Farmington River8/10/202177
FR-EG1Farmington River8/24/20211414

FARMINGTON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
RO-F1Roaring Brook6/8/202124
RO-F1Roaring Brook6/22/202176
RO-F1Roaring Brook7/13/202199
RO-F1Roaring Brook7/27/202145
RO-F1Roaring Brook8/10/202129
RO-F1Roaring Brook8/24/2021219
FR-F1Farmington River6/8/202136
FR-F1Farmington River6/22/202125
FR-F1Farmington River7/13/2021345
FR-F1Farmington River7/27/202125
FR-F1Farmington River8/10/202130
FR-F1Farmington River8/24/20211203
PR-F1Pequabuck River6/8/2021727
PR-F1Pequabuck River6/22/2021272
PR-F1Pequabuck River7/13/2021250
PR-F1Pequabuck River7/27/2021214
PR-F1Pequabuck River8/10/2021201
PR-F1Pequabuck River8/24/2021517
FR-F2Farmington River6/8/2021155
FR-F2Farmington River6/22/202143
FR-F2Farmington River7/13/2021488
FR-F2Farmington River7/27/202145
FR-F2Farmington River8/10/202150
FR-F2Farmington River8/24/20211203

SIMSBURY

 Site NumberStream NameCollection DateE.coli colonies/100 mL
MS-S1Minister Brook 6/15/20211119
MS-S1Minister Brook 6/29/2021344
MS-S1Minister Brook 7/20/2021134
MS-S1Minister Brook8/3/2021326
MS-S1Minister Brook8/17/2021196
MS-S1Minister Brook8/31/2021214
RB-S1Russell Brook6/15/2021152
RB-S1Russell Brook6/29/202179
RB-S1Russell Brook7/20/2021250
RB-S1Russell Brook8/3/2021260
RB-S1Russell Brook8/17/2021365
RB-S1Russell Brook8/31/2021365
FR-S1Farmington River6/15/2021313
FR-S1Farmington River6/29/202129
FR-S1Farmington River7/20/202172
FR-S1Farmington River8/3/202164
FR-S1Farmington River8/17/202161
FR-S1Farmington River8/31/202170
FR-S3Farmington River6/15/2021193
FR-S3Farmington River6/29/202142
FR-S3Farmington River7/20/2021148
FR-S3Farmington River8/3/202170
FR-S3Farmington River8/17/202149
FR-S3Farmington River8/31/202147
HB-S2Hop Brook6/15/20212419
HB-S2Hop Brook6/29/202178
HB-S2Hop Brook7/20/202196
HB-S2Hop Brook8/3/202191
HB-S2Hop Brook8/17/202184
HB-S2Hop Brook8/31/2021121
FR-S2Farmington River6/15/2021980
FR-S2Farmington River6/29/202180
FR-S2Farmington River7/20/2021147
FR-S2Farmington River8/3/202166
FR-S2Farmington River8/17/202149
FR-S2Farmington River8/31/202158
MB-S1Minnisunk Brook6/15/202169
MB-S1Minnisunk Brook6/29/2021108
MB-S1Minnisunk Brook7/20/202127
MB-S1Minnisunk Brook7/20/202124
MB-S1Minnisunk Brook8/3/202189
MB-S1Minnisunk Brook8/17/202152
MB-S1Minnisunk Brook8/31/202123

GRANBY

 Site NumberStream NameCollection DateE.coli colonies/100 mL
SB-EB1East Branch Salmon Brook6/8/2021178
SB-EB1East Branch Salmon Brook6/22/2021456
SB-EB1East Branch Salmon Brook7/13/2021387
SB-EB1East Branch Salmon Brook7/27/2021248
SB-EB1East Branch Salmon Brook8/10/2021261
SB-EB1East Branch Salmon Brook8/24/20211986
SB-2Salmon Brook6/8/2021193
SB-2Salmon Brook6/22/2021290
SB-2Salmon Brook7/13/2021272
SB-2Salmon Brook7/27/2021147
SB-2Salmon Brook8/10/2021152
SB-2Salmon Brook8/24/20211986
SB-WB3West Branch Salmon Brook6/15/2021121
SB-WB3West Branch Salmon Brook6/29/2021114.5
SB-WB3West Branch Salmon Brook7/20/202170
SB-WB3West Branch Salmon Brook8/3/202136
SB-WB3West Branch Salmon Brook8/17/2021157
SB-WB3West Branch Salmon Brook8/31/2021144

WINDSOR

 Site NumberStream NameCollection DateE.coli colonies/100 mL
FR-W1Farmington River6/8/202118
FR-W1Farmington River6/22/202130
FR-W1Farmington River7/13/2021199
FR-W1Farmington River7/27/202139
FR-W1Farmington River8/10/202136
FR-W1Farmington River8/24/20212420
PB-W1Phelps Brook6/8/2021146
PB-W1Phelps Brook6/22/2021167
PB-W1Phelps Brook7/13/2021488
PB-W1Phelps Brook7/27/202199
PB-W1Phelps Brook8/10/202154
PB-W1Phelps Brook8/24/2021291
ML-W1Mill Brook6/8/2021285
ML-W1Mill Brook6/22/2021648
ML-W1Mill Brook7/13/2021866
ML-W1Mill Brook7/27/2021687
ML-W1Mill Brook8/10/2021727
ML-W1Mill Brook8/24/2021517
FR-W2Farmington River6/8/202168
FR-W2Farmington River6/8/202166
FR-W2Farmington River6/22/202116
FR-W2Farmington River7/13/2021613
FR-W2Farmington River7/27/202122
FR-W2Farmington River8/10/202124
FR-W2Farmington River8/24/20211553
             

YEARLY GEOMETRIC MEAN

AVON2007200820092010201120122013201420152016
TB-A1212945058805184 112380
NB-A116335890612138209130 90119277
BURLINGTON2007200820092010201120122013201420152016
BB-B1N/AN/AN/AN/A1504739 24162364
CANTON2007200820092010201120122013201420152016
CB-C1N/A35520740833216010556265770
EAST GRANBY2007200820092010201120122013201420152016
FR-EG1N/AN/AN/AN/A36516978 13574181
FARMINGTON2007200820092010201120122013201420152016
RO-F1N/AN/A102104858862 85192221
FR-F12812083557912062 537360
PR-F18461437352750719697329 245642780
FR-F2141413122179199223159 53150204
FR-F3N/AN/AN/A
N/AN/AN/A340
SIMSBURY2007200820092010201120122013201420152016
SB-EB1567378438234715318177 772243501
SB-2N/AN/AN/AN/A445313218 910178367
MS-S1907706071373305321312 78118191
RB-S1190431172415338172568 14377167
FR-S11024471981551659561 1514193
GRANBY2007200820092010201120122013201420152016
MB-S185833616764303558 5425866
SB-WB3N/A1741211332589095 124307125
FR-S316037916910520088108 92156107
HB-S1117328277203430398149 70347240
FR-S222631418411019912687 7330447
WINDSOR2007200820092010201120122013201420152016
FR-W1101N/A12112321312671 5250275
PB-W1N/AN/AN/A174328156251 149287672
ML-W1N/AN/A368367529510195 2903091271
FR-W2N/AN/AN/AN/A21312671 9174112