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 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.

RECREATIONGEOMETRIC MEANSINGLE SAMPLE MAXIMUM
Designated Swimmingless than 126/100ml235/100ml
Non-designated Swimmingless than 126/100ml410/100ml
All Other Recreational Usesless than 126/100ml576/100ml

 2021 E.coli Chart

AVON

 Site NumberStream NameCollection DateE.coli colonies/100 mL
TB-A1Thompson Brook6/7/20227.5
TB-A1Thompson Brook6/21/20229.8
TB-A1Thompson Brook7/12/20222
TB-A1Thompson Brook7/26/202247.1
TB-A1Thompson Brook8/9/202233.1
TB-A1Thompson Brook8/23/202212.2
NB-A1Nod Brook6/7/202258.1
NB-A1Nod Brook6/21/2022110.0
NB-A1Nod Brook7/12/202279.8
NB-A1Nod Brook7/26/2022461.1
NB-A1Nod Brook8/9/2022275.5
NB-A1Nod Brook8/23/2022218.7

BURLINGTON

 Site NumberStream NameCollection DateE.Coli Colonies/100 ML
BB-B1Bunnell Brook6/14/202231.8
BB-B1Bunnell Brook6/28/2022
36.4
BB-B1Bunnell Brook7/19/2022435.2
BB-B1Bunnell Brook8/2/202221.6
BB-B1Bunnell Brook8/16/202212.2
BB-B1Bunnell Brook

CANTON

 Site NumberStream NameCollection DateE.Coli Colonies/100 ML
CB-C1Cherry Brook6/6/202253.6
CB-C1Cherry Brook
CB-C1Cherry Brook
CB-C1Cherry Brook
CB-C1Cherry Brook
CB-C1Cherry Brook

EAST GRANBY

 Site NumberStream NameCollection DateE.Coli Colonies/100 ML
FR-EG1Farmington River6/14/202285.5
FR-EG1Farmington River6/28/202275.4
FR-EG1Farmington River7/19/2022290.9
FR-EG1Farmington River8/2/202272.3
FR-EG1Farmington River8/16/202224.3
FR-EG1Farmington River

FARMINGTON

 Site NumberStream NameCollection Date
E.Coli Colonies/100 ML
RO-F1Roaring Brook6/14/202240.8
RO-F1Roaring Brook6/28/202260.2

RO-F1Roaring Brook7/19/2022307.6
RO-F1Roaring Brook8/2/202281.6
RO-F1Roaring Brook8/16/202267.0
RO-F1Roaring Brook
FR-F1Farmington River6/14/202240.8
FR-F1Farmington River6/28/202232.7
FR-F1Farmington River7/19/2022102.2
FR-F1Farmington River8/2/202234.5
FR-F1Farmington River8/16/202224.6
FR-F1Farmington River
PR-F1Pequabuck River6/14/2022185.0
PR-F1Pequabuck River6/28/20222419.6
PR-F1Pequabuck River7/19/2022>2419.6
PR-F1Pequabuck River8/2/2022461.1
PR-F1Pequabuck River8/16/2022143.9
PR-F1Pequabuck River
FR-F2Farmington River6/14/202291.0
FR-F2Farmington River6/28/2022547.5
FR-F2Farmington River7/19/20221553.1
FR-F2Farmington River8/2/202286.0
FR-F2Farmington River8/16/202218.9
FR-F2Farmington River

SIMSBURY

 Site NumberStream NameCollection Date
E.Coli Colonies/100 ML
MS-S1Minister Brook 6/7/202268.9
MS-S1Minister Brook 6/21/202286.5
MS-S1Minister Brook 7/12/2022816.4
MS-S1Minister Brook7/26/20221553.1
MS-S1Minister Brook8/9/2022517.2
MS-S1Minister Brook8/23/2022517.2
RB-S1Russell Brook6/7/2022146.7
RB-S1Russell Brook6/21/2022224.7
RB-S1Russell Brook7/12/2022920.8
RB-S1Russell Brook7/26/202276.2
RB-S1Russell Brook8/9/2022579.4
RB-S1Russell Brook8/23/2022187.2
FR-S1Farmington River6/7/202254.8
FR-S1Farmington River6/21/202266.3
FR-S1Farmington River7/12/202216.9
FR-S1Farmington River7/26/2022110.0
FR-S1Farmington River8/9/202245.2
FR-S1Farmington River8/23/202242.6
FR-S3Farmington River6/7/202252.9
FR-S3Farmington River6/21/202250.4
FR-S3Farmington River7/12/202252.0
FR-S3Farmington River7/26/202291.0
FR-S3Farmington River8/9/202253.6
FR-S3Farmington River8/23/202227.9
HB-S2Hop Brook6/7/2022248.9
HB-S2Hop Brook6/21/202262.0
HB-S2Hop Brook7/12/202235.5
HB-S2Hop Brook7/26/2022224.7
HB-S2Hop Brook8/9/2022261.3
HB-S2Hop Brook8/23/202271.2
FR-S2Farmington River6/7/202265.0
FR-S2Farmington River6/21/202251.2
FR-S2Farmington River7/12/202283.9
FR-S2Farmington River7/26/2022325.5
FR-S2Farmington River8/9/202257.3
FR-S2Farmington River8/23/202218.5
MB-S1Minnisunk Brook6/7/202229.2
MB-S1Minnisunk Brook6/21/202222.8
MB-S1Minnisunk Brook7/12/202213.4
MB-S1Minnisunk Brook7/26/20223.0
MB-S1Minnisunk Brook8/9/202227.5
MB-S1Minnisunk Brook8/23/202231.8
MB-S1Minnisunk Brook

GRANBY

 Site NumberStream NameCollection Date
E.Coli Colonies/100 ML
SB-EB1East Branch Salmon Brook6/14/2022261.3
SB-EB1East Branch Salmon Brook6/28/2022410.6
SB-EB1East Branch Salmon Brook7/19/2022547.5
SB-EB1East Branch Salmon Brook8/2/2022517.2
SB-EB1East Branch Salmon Brook8/16/2022172.5
SB-EB1East Branch Salmon Brook
SB-2Salmon Brook6/14/2022218.7
SB-2Salmon Brook6/28/2022365.4
SB-2Salmon Brook7/19/2022261.3
SB-2Salmon Brook8/2/2022209.8
SB-2Salmon Brook8/16/2022185.0
SB-2Salmon Brook
SB-WB3West Branch Salmon Brook6/7/2022260.3
SB-WB3West Branch Salmon Brook6/21/202264.4
SB-WB3West Branch Salmon Brook7/12/202258.3
SB-WB3West Branch Salmon Brook7/26/202290.9
SB-WB3West Branch Salmon Brook8/9/2022161.6
SB-WB3West Branch Salmon Brook

WINDSOR

 Site NumberStream NameCollection DateE.Coli Colonies/100 ML
FR-W1Farmington River6/14/202260.2
FR-W1Farmington River6/28/2022139.6

FR-W1Farmington River7/19/2022224.7
FR-W1Farmington River8/2/2022579.4
FR-W1Farmington River8/16/202225.6
FR-W1Farmington River
PB-W1Phelps Brook6/14/2022161.6
PB-W1Phelps Brook6/28/2022218.7
PB-W1Phelps Brook7/19/2022517.2
PB-W1Phelps Brook8/2/202281.6
PB-W1Phelps Brook8/16/202271.2
PB-W1Phelps Brook
ML-W1Mill Brook6/14/2022261.3
ML-W1Mill Brook6/28/2022387.3
ML-W1Mill Brook7/19/20222419.6
ML-W1Mill Brook8/2/2022209.8
ML-W1Mill Brook8/16/2022307.6
ML-W1Mill Brook
FR-W2Farmington River6/14/202271.2
FR-W2Farmington River6/28/2022206.4
FR-W2Farmington River7/19/2022435.2
FR-W2Farmington River8/2/202240.2
FR-W2Farmington River8/16/202229.5
FR-W2Farmington River
FR-W2Farmington River

       

YEARLY GEOMETRIC MEAN

AVON20072008200920102011201220132014201520162017201820192021
TB-A1212945058805184 11238019632742
NB-A116335890612138209130 9011927717231862112
BURLINGTON20072008200920102011201220132014201520162017201820192021
BB-B1N/AN/AN/AN/A1504739 241623641951332343
CANTON20072008200920102011201220132014201520162017201820192021
CB-C1N/A355207408332160105562657704371454548135
EAST GRANBY20072008200920102011201220132014201520162017201820192021
FR-EG1N/AN/AN/AN/A36516978 1357418121929375194
FARMINGTON20072008200920102011201220132014201520162017201820192021
RO-F1N/AN/A102104858862 851922213581477270
FR-F12812083557912062 53736012610340120
PR-F18461437352750719697329 245642780829676746282
FR-F2141413122179199223159 53150204235223133181
SIMSBURY20072008200920102011201220132014201520162017201820192021
SB-EB1567378438234715318177 772243501523882344457
SB-2N/AN/AN/AN/A445313218 910178367631643252324
MS-S1907706071373305321312 7811819150617156222
RB-S1190431172415338172568 14377167739789285
FR-S11024471981551659561 1514193631674068
GRANBY20072008200920102011201220132014201520162017201820192021
MB-S185833616764303558 542586624582043
SB-WB3N/A1741211332589095 12430712511217111688
FR-S316037916910520088108 92156107611495271
HB-S1117328277203430398149 703472407828583107
FR-S222631418411019912687 7330447881984479
WINDSOR20072008200920102011201220132014201520162017201820192021
FR-W1101N/A12112321312671 525027524411526142
PB-W1N/AN/AN/A174328156251 14928767261557781165
ML-W1N/AN/A368367529510195 2903091271984824253667
FR-W2N/AN/AN/AN/A21312671 91741122011290135