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

 2019 E.coli Chart

AVON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
TB-A1Thompson Brook5/20/1920
TB-A1Thompson Brook6/10/201975
TB-A1Thompson Brook6/24/201920
TB-A1Thompson Brook7/15/201920
TB-A1Thompson Brook7/29/201920
TB-A1Thompson Brook8/12/2019
31
NB-A1Nod Brook5/20/201941
NB-A1Nod Brook6/10/201974
NB-A1Nod Brook6/24/201963
NB-A1Nod Brook7/15/201974
NB-A1Nod Brook7/29/201998
NB-A1Nod Brook8/12/201941

BURLINGTON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
BB-B1Bunnell Brook6/3/201920
BB-B1Bunnell Brook6/18/201910
BB-B1Bunnell Brook7/8/201952
BB-B1Bunnell Brook7/22/2019<10
BB-B1Bunnell Brook8/5/2019
31
BB-B1Bunnell Brook8/19/201952

CANTON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
CB-C1Cherry Brook6/3/2019813
CB-C1Cherry Brook6/18/2019712
CB-C1Cherry Brook7/8/2019571
CB-C1Cherry Brook7/22/20191267
CB-C1Cherry Brook8/5/2019336
CB-C1Cherry Brook8/19/2019193

EAST GRANBY

 Site NumberStream NameCollection DateE.coli colonies/100 mL
FR-EG1Farmington River6/3/201975
FR-EG1Farmington River6/18/201952
FR-EG1Farmington River7/8/2019161
FR-EG1Farmington River7/22/201975
FR-EG1Farmington River8/5/201962
FR-EG1Farmington River8/19/201963

FARMINGTON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
RO-F1Roaring Brook6/3/201941
RO-F1Roaring Brook6/18/201998
RO-F1Roaring Brook7/8/2019121
RO-F1Roaring Brook7/22/2019110
RO-F1Roaring Brook8/5/2019
20
RO-F1Roaring Brook8/19/2019134
FR-F1Farmington River6/3/2019134
FR-F1Farmington River6/18/201963
FR-F1Farmington River7/8/201963
FR-F1Farmington River7/22/201941
FR-F1Farmington River8/5/201920
FR-F1Farmington River8/19/201910
PR-F1Pequabuck River6/3/20191576
PR-F1Pequabuck River6/18/20192359
PR-F1Pequabuck River7/8/2019377
PR-F1Pequabuck River7/22/2019295
PR-F1Pequabuck River8/5/20192098
PR-F1Pequabuck River8/19/2019199
FR-F2Farmington River6/3/2018259
FR-F2Farmington River6/18/2018158
FR-F2Farmington River7/8/2019119
FR-F2Farmington River7/22/201985
FR-F2Farmington River8/5/2019121
FR-F2Farmington River8/19/2019109

SIMSBURY

 Site NumberStream NameCollection DateE.coli colonies/100 mL
MB-S1Munnisunk Brook5/20/201910
MB-S1Munnisunk Brook6/10/201910
MB-S1Munnisunk Brook6/24/201920
MB-S1Munnisunk Brook7/15/201930
MB-S1Munnisunk Brook7/29/201998
MB-S1Munnisunk Brook8/12/201910
MS-S1Minister Brook5/20/201910
MS-S1Minister Brook6/10/201985
MS-S1Minister Brook6/24/2019246
MS-S1Minister Brook7/15/2019448
MS-S1Minister Brook7/29/2019565
MS-S1Minister Brook8/12/2019275
RB-S1Russell Brook5/20/201910
RB-S1Russell Brook6/10/201910
RB-S1Russell Brook6/24/201963
RB-S1Russell Brook7/15/2019171
RB-S1Russell Brook7/29/2019373
RB-S1Russell Brook8/12/20191274
FR-S1Farmington River5/20/201974
FR-S1Farmington River6/10/201930
FR-S1Farmington River6/24/201941
FR-S1Farmington River7/15/201931
FR-S1Farmington River7/29/201910
FR-S1Farmington River8/12/2019148
FR-S3Farmington River5/20/201963
FR-S3Farmington River6/10/201963
FR-S3Farmington River6/24/201941
FR-S3Farmington River7/15/201941
FR-S3Farmington River7/29/201975
FR-S3Farmington River8/12/201941
HB-S2Hop Brook5/20/2019110
HB-S2Hop Brook6/10/201952
HB-S2Hop Brook6/24/201975
HB-S2Hop Brook7/15/201920
HB-S2Hop Brook7/29/2019457
HB-S2Hop Brook8/12/201986
FR-S2Farmington River5/20/201963
FR-S2Farmington River6/10/201930
FR-S2Farmington River6/24/201941
FR-S2Farmington River7/15/201931
FR-S2Farmington River7/29/201963
FR-S2Farmington River8/12/201951

GRANBY

 Site NumberStream NameCollection DateE.coli colonies/100 mL
SB-EB1East Branch Salmon Brook6/3/2019233
SB-EB1East Branch Salmon Brook6/18/2019295
SB-EB1East Branch Salmon Brook7/8/2019631
SB-EB1East Branch Salmon Brook7/22/2019455
SB-EB1East Branch Salmon Brook8/5/2019142
SB-EB1East Branch Salmon Brook8/19/2019591
SB-2Salmon Brook6/3/201997
SB-2Salmon Brook6/18/2019373
SB-2Salmon Brook7/8/2019830
SB-2Salmon Brook7/22/2019282
SB-2Salmon Brook8/5/2019160
SB-2Salmon Brook8/19/2019187
SB-WB3West Branch Salmon Brook5/20/2019683
SB-WB3West Branch Salmon Brook6/10/201910
SB-WB3West Branch Salmon Brook6/24/2019135
SB-WB3West Branch Salmon Brook7/15/2019122
SB-WB3West Branch Salmon Brook7/29/2019121
SB-WB3West Branch Salmon Brook8/12/2019175

WINDSOR

 Site NumberStream NameCollection DateE.coli colonies/100 mL
FR-W1Farmington River6/3/201910
FR-W1Farmington River6/18/201941
FR-W1Farmington River7/8/201952
FR-W1Farmington River7/22/201910
FR-W1Farmington River8/5/201931
FR-W1Farmington River8/19/201951
PB-W1Phelps Brook6/3/2019132
PB-W1Phelps Brook6/18/201963
PB-W1Phelps Brook7/8/2019171
PB-W1Phelps Brook7/22/201974
PB-W1Phelps Brook8/5/201910
PB-W1Phelps Brook8/19/2019`262
ML-W1Mill Brook6/3/2019272
ML-W1Mill Brook6/18/2019383
ML-W1Mill Brook7/8/2019410
ML-W1Mill Brook7/22/2019246
ML-W1Mill Brook8/5/201963
ML-W1Mill Brook8/19/2019397
FR-W2Farmington River6/3/201952
FR-W2Farmington River6/18/201941
FR-W2Farmington River7/8/2019<10
FR-W2Farmington River7/22/2019231
FR-W2Farmington River8/5/2019420
FR-W2Farmington River8/19/2019265
             

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

Close Menu