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 Number	Stream Name	Collection Date	E.coli colonies/100 mL
	TB-A1	Thompson Brook	5/20/19	20
	TB-A1	Thompson Brook	6/10/2019	75
	TB-A1	Thompson Brook	6/24/2019	20
	TB-A1	Thompson Brook	7/15/2019	20
	TB-A1	Thompson Brook	7/29/2019	20
	TB-A1	Thompson Brook	8/12/2019	31
	NB-A1	Nod Brook	5/20/2019	41
	NB-A1	Nod Brook	6/10/2019	74
	NB-A1	Nod Brook	6/24/2019	63
	NB-A1	Nod Brook	7/15/2019	74
	NB-A1	Nod Brook	7/29/2019	98
	NB-A1	Nod Brook	8/12/2019	41

BURLINGTON

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	BB-B1	Bunnell Brook	6/3/2019	20
	BB-B1	Bunnell Brook	6/18/2019	10
	BB-B1	Bunnell Brook	7/8/2019	52
	BB-B1	Bunnell Brook	7/22/2019	<10
	BB-B1	Bunnell Brook	8/5/2019	31
	BB-B1	Bunnell Brook	8/19/2019	52

CANTON

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	CB-C1	Cherry Brook	6/3/2019	813
	CB-C1	Cherry Brook	6/18/2019	712
	CB-C1	Cherry Brook	7/8/2019	571
	CB-C1	Cherry Brook	7/22/2019	1267
	CB-C1	Cherry Brook	8/5/2019	336
	CB-C1	Cherry Brook	8/19/2019	193

EAST GRANBY

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	FR-EG1	Farmington River	6/3/2019	75
	FR-EG1	Farmington River	6/18/2019	52
	FR-EG1	Farmington River	7/8/2019	161
	FR-EG1	Farmington River	7/22/2019	75
	FR-EG1	Farmington River	8/5/2019	62
	FR-EG1	Farmington River	8/19/2019	63

FARMINGTON

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	RO-F1	Roaring Brook	6/3/2019	41
	RO-F1	Roaring Brook	6/18/2019	98
	RO-F1	Roaring Brook	7/8/2019	121
	RO-F1	Roaring Brook	7/22/2019	110
	RO-F1	Roaring Brook	8/5/2019	20
	RO-F1	Roaring Brook	8/19/2019	134
	FR-F1	Farmington River	6/3/2019	134
	FR-F1	Farmington River	6/18/2019	63
	FR-F1	Farmington River	7/8/2019	63
	FR-F1	Farmington River	7/22/2019	41
	FR-F1	Farmington River	8/5/2019	20
	FR-F1	Farmington River	8/19/2019	10
	PR-F1	Pequabuck River	6/3/2019	1576
	PR-F1	Pequabuck River	6/18/2019	2359
	PR-F1	Pequabuck River	7/8/2019	377
	PR-F1	Pequabuck River	7/22/2019	295
	PR-F1	Pequabuck River	8/5/2019	2098
	PR-F1	Pequabuck River	8/19/2019	199
	FR-F2	Farmington River	6/3/2018	259
	FR-F2	Farmington River	6/18/2018	158
	FR-F2	Farmington River	7/8/2019	119
	FR-F2	Farmington River	7/22/2019	85
	FR-F2	Farmington River	8/5/2019	121
	FR-F2	Farmington River	8/19/2019	109

SIMSBURY

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	MB-S1	Munnisunk Brook	5/20/2019	10
	MB-S1	Munnisunk Brook	6/10/2019	10
	MB-S1	Munnisunk Brook	6/24/2019	20
	MB-S1	Munnisunk Brook	7/15/2019	30
	MB-S1	Munnisunk Brook	7/29/2019	98
	MB-S1	Munnisunk Brook	8/12/2019	10
	MS-S1	Minister Brook	5/20/2019	10
	MS-S1	Minister Brook	6/10/2019	85
	MS-S1	Minister Brook	6/24/2019	246
	MS-S1	Minister Brook	7/15/2019	448
	MS-S1	Minister Brook	7/29/2019	565
	MS-S1	Minister Brook	8/12/2019	275
	RB-S1	Russell Brook	5/20/2019	10
	RB-S1	Russell Brook	6/10/2019	10
	RB-S1	Russell Brook	6/24/2019	63
	RB-S1	Russell Brook	7/15/2019	171
	RB-S1	Russell Brook	7/29/2019	373
	RB-S1	Russell Brook	8/12/2019	1274
	FR-S1	Farmington River	5/20/2019	74
	FR-S1	Farmington River	6/10/2019	30
	FR-S1	Farmington River	6/24/2019	41
	FR-S1	Farmington River	7/15/2019	31
	FR-S1	Farmington River	7/29/2019	10
	FR-S1	Farmington River	8/12/2019	148
	FR-S3	Farmington River	5/20/2019	63
	FR-S3	Farmington River	6/10/2019	63
	FR-S3	Farmington River	6/24/2019	41
	FR-S3	Farmington River	7/15/2019	41
	FR-S3	Farmington River	7/29/2019	75
	FR-S3	Farmington River	8/12/2019	41
	HB-S2	Hop Brook	5/20/2019	110
	HB-S2	Hop Brook	6/10/2019	52
	HB-S2	Hop Brook	6/24/2019	75
	HB-S2	Hop Brook	7/15/2019	20
	HB-S2	Hop Brook	7/29/2019	457
	HB-S2	Hop Brook	8/12/2019	86
	FR-S2	Farmington River	5/20/2019	63
	FR-S2	Farmington River	6/10/2019	30
	FR-S2	Farmington River	6/24/2019	41
	FR-S2	Farmington River	7/15/2019	31
	FR-S2	Farmington River	7/29/2019	63
	FR-S2	Farmington River	8/12/2019	51

GRANBY

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	SB-EB1	East Branch Salmon Brook	6/3/2019	233
	SB-EB1	East Branch Salmon Brook	6/18/2019	295
	SB-EB1	East Branch Salmon Brook	7/8/2019	631
	SB-EB1	East Branch Salmon Brook	7/22/2019	455
	SB-EB1	East Branch Salmon Brook	8/5/2019	142
	SB-EB1	East Branch Salmon Brook	8/19/2019	591
	SB-2	Salmon Brook	6/3/2019	97
	SB-2	Salmon Brook	6/18/2019	373
	SB-2	Salmon Brook	7/8/2019	830
	SB-2	Salmon Brook	7/22/2019	282
	SB-2	Salmon Brook	8/5/2019	160
	SB-2	Salmon Brook	8/19/2019	187
	SB-WB3	West Branch Salmon Brook	5/20/2019	683
	SB-WB3	West Branch Salmon Brook	6/10/2019	10
	SB-WB3	West Branch Salmon Brook	6/24/2019	135
	SB-WB3	West Branch Salmon Brook	7/15/2019	122
	SB-WB3	West Branch Salmon Brook	7/29/2019	121
	SB-WB3	West Branch Salmon Brook	8/12/2019	175

WINDSOR

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	FR-W1	Farmington River	6/3/2019	10
	FR-W1	Farmington River	6/18/2019	41
	FR-W1	Farmington River	7/8/2019	52
	FR-W1	Farmington River	7/22/2019	10
	FR-W1	Farmington River	8/5/2019	31
	FR-W1	Farmington River	8/19/2019	51
	PB-W1	Phelps Brook	6/3/2019	132
	PB-W1	Phelps Brook	6/18/2019	63
	PB-W1	Phelps Brook	7/8/2019	171
	PB-W1	Phelps Brook	7/22/2019	74
	PB-W1	Phelps Brook	8/5/2019	10
	PB-W1	Phelps Brook	8/19/2019`	262
	ML-W1	Mill Brook	6/3/2019	272
	ML-W1	Mill Brook	6/18/2019	383
	ML-W1	Mill Brook	7/8/2019	410
	ML-W1	Mill Brook	7/22/2019	246
	ML-W1	Mill Brook	8/5/2019	63
	ML-W1	Mill Brook	8/19/2019	397
	FR-W2	Farmington River	6/3/2019	52
	FR-W2	Farmington River	6/18/2019	41
	FR-W2	Farmington River	7/8/2019	<10
	FR-W2	Farmington River	7/22/2019	231
	FR-W2	Farmington River	8/5/2019	420
	FR-W2	Farmington River	8/19/2019	265

YEARLY GEOMETRIC MEAN

AVON	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016
TB-A1	21	294	50	58	80	51	84	11	23	80
NB-A1	163	358	90	612	138	209	130	90	119	277
BURLINGTON	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016
BB-B1	N/A	N/A	N/A	N/A	150	47	39	24	162	364
CANTON	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016
CB-C1	N/A	355	207	408	332	160	105	56	265	770
EAST GRANBY	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016
FR-EG1	N/A	N/A	N/A	N/A	365	169	78	135	74	181
FARMINGTON	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016
RO-F1	N/A	N/A	102	104	85	88	62	85	192	221
FR-F1	28	120	83	55	79	120	62	53	73	60
PR-F1	846	1437	352	750	719	697	329	245	642	780
FR-F2	141	413	122	179	199	223	159	53	150	204
FR-F3	N/A	N/A	N/A	N/A	N/A	N/A	340
SIMSBURY	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016
SB-EB1	567	378	438	234	715	318	177	772	243	501
SB-2	N/A	N/A	N/A	N/A	445	313	218	910	178	367
MS-S1	90	770	607	1373	30	532	1312	78	118	191
RB-S1	190	431	172	415	338	172	568	143	77	167
FR-S1	102	447	198	155	165	95	61	151	41	93
GRANBY	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016
MB-S1	858	3361	67	64	30	35	58	54	258	66
SB-WB3	N/A	174	121	133	258	90	95	124	307	125
FR-S3	160	379	169	105	200	88	108	92	156	107
HB-S1	117	328	277	203	430	398	149	70	347	240
FR-S2	226	314	184	110	199	126	87	73	304	47
WINDSOR	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016
FR-W1	101	N/A	121	123	213	126	71	52	50	275
PB-W1	N/A	N/A	N/A	174	328	156	251	149	287	672
ML-W1	N/A	N/A	368	367	529	510	195	290	309	1271
FR-W2	N/A	N/A	N/A	N/A	213	126	71	91	74	112