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

 2018 E.coli Chart

AVON

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	TB-A1	Thompson Brook	5/21/2018	73
	TB-A1	Thompson Brook	6/11/2018	31
	TB-A1	Thompson Brook	6/25/2018	3255
	TB-A1	Thompson Brook	7/16/2018	41
	TB-A1	Thompson Brook	7/30/2018	10
	TB-A1	Thompson Brook	8/13/2018	20
	NB-A1	Nod Brook	5/21/2018	98
	NB-A1	Nod Brook	6/11/2018	175
	NB-A1	Nod Brook	6/25/2018	12997
	NB-A1	Nod Brook	7/16/2018	355
	NB-A1	Nod Brook	7/30/2018	121
	NB-A1	Nod Brook	8/13/2018	108

BURLINGTON

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	BB-B1	Bunnell Brook	6/4/2018	2143
	BB-B1	Bunnell Brook	6/18/2018	63
	BB-B1	Bunnell Brook	7/9/2018	20
	BB-B1	Bunnell Brook	7/23/2018	959
	BB-B1	Bunnell Brook	8/6/2018	41
	BB-B1	Bunnell Brook	8/20/2018	52

CANTON

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	CB-C1	Cherry Brook	6/4/2018	4106
	CB-C1	Cherry Brook	6/18/2018	2481
	CB-C1	Cherry Brook	7/9/2018	408
	CB-C1	Cherry Brook	7/23/2018	5172
	CB-C1	Cherry Brook	8/6/2018	1616
	CB-C1	Cherry Brook	8/20/2018	272

EAST GRANBY

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	FR-EG1	Farmington River	6/4/2018	1333
	FR-EG1	Farmington River	6/18/2018	121
	FR-EG1	Farmington River	7/9/2018	63
	FR-EG1	Farmington River	7/23/2018	813
	FR-EG1	Farmington River	8/6/2018	428
	FR-EG1	Farmington River	8/20/2018	179

FARMINGTON

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	RO-F1	Roaring Brook	6/4/2018	1785
	RO-F1	Roaring Brook	6/18/2018	75
	RO-F1	Roaring Brook	7/9/2018	97
	RO-F1	Roaring Brook	7/23/2018	75
	RO-F1	Roaring Brook	8/6/2018	142
	RO-F1	Roaring Brook	8/20/2018	74
	FR-F1	Farmington River	6/4/2018	97
	FR-F1	Farmington River	6/18/2018	41
	FR-F1	Farmington River	7/9/2018	31
	FR-F1	Farmington River	7/23/2018	250
	FR-F1	Farmington River	8/6/2018	213
	FR-F1	Farmington River	8/20/2018	187
	PR-F1	Pequabuck River	6/4/2018	857
	PR-F1	Pequabuck River	6/18/2018	1014
	PR-F1	Pequabuck River	7/9/2018	231
	PR-F1	Pequabuck River	7/23/2018	3873
	PR-F1	Pequabuck River	8/6/2018	530
	PR-F1	Pequabuck River	8/20/2018	231
	FR-F2	Farmington River	6/4/2018	256
	FR-F2	Farmington River	6/18/2018	323
	FR-F2	Farmington River	7/9/2018	52
	FR-F2	Farmington River	7/23/2018	1081
	FR-F2	Farmington River	8/6/2018	243
	FR-F2	Farmington River	8/20/2018	109
	FR-F3	Farmington River	6/4/2018	512
	FR-F3	Farmington River	6/18/2018	108
	FR-F3	Farmington River	7/9/2018	146
	FR-F3	Farmington River	7/23/2018	1178
	FR-F3	Farmington River	8/6/2018	480
	FR-F3	Farmington River	8/20/2018	197

SIMSBURY

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	MB-S1	Munnisunk Brook	5/21/2018	31
	MB-S1	Munnisunk Brook	6/11/2018	10
	MB-S1	Munnisunk Brook	6/25/2018	1956
	MB-S1	Munnisunk Brook	7/16/2018	74
	MB-S1	Munnisunk Brook	7/30/2018	<10
	MB-S1	Munnisunk Brook	8/13/2018	86
	MS-S1	Minister Brook	5/21/2018	677
	MS-S1	Minister Brook	6/11/2018	85
	MS-S1	Minister Brook	6/25/2018	>24196
	MS-S1	Minister Brook	7/16/2018	119
	MS-S1	Minister Brook	7/30/2018	108
	MS-S1	Minister Brook	8/13/2018	3076
	RB-S1	Russell Brook	5/21/2018	31
	RB-S1	Russell Brook	6/11/2018	52
	RB-S1	Russell Brook	6/25/2018	794
	RB-S1	Russell Brook	7/16/2018	132
	RB-S1	Russell Brook	7/30/2018	<10
	RB-S1	Russell Brook	8/13/2018	480
	FR-S1	Farmington River	5/21/2018	110
	FR-S1	Farmington River	6/11/2018	110
	FR-S1	Farmington River	6/25/2018	2282
	FR-S1	Farmington River	7/16/2018	74
	FR-S1	Farmington River	7/30/2018	74
	FR-S1	Farmington River	8/13/2018	144
	FR-S3	Farmington River	5/21/2018	158
	FR-S3	Farmington River	6/11/2018	74
	FR-S3	Farmington River	6/25/2018	767
	FR-S3	Farmington River	7/16/2018	20
	FR-S3	Farmington River	7/30/2018	146
	FR-S3	Farmington River	8/13/2018	426
	HB-S1	Hop Brook	5/21/2018	97
	HB-S1	Hop Brook	6/11/2018	134
	HB-S1	Hop Brook	6/25/2018	3968
	HB-S1	Hop Brook	7/16/2018	84
	HB-S1	Hop Brook	7/30/2018	74
	HB-S1	Hop Brook	8/13/2018	1658
	FR-S2	Farmington River	5/21/2018	122
	FR-S2	Farmington River	6/11/2018	74
	FR-S2	Farmington River	6/25/2018	1553
	FR-S2	Farmington River	7/16/2018	98
	FR-S2	Farmington River	7/30/2018	145
	FR-S2	Farmington River	8/13/2018	301

GRANBY

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	SB-EB1	East Branch Salmon Brook	6/4/2018	3448
	SB-EB1	East Branch Salmon Brook	6/18/2018	771
	SB-EB1	East Branch Salmon Brook	7/9/2018	324
	SB-EB1	East Branch Salmon Brook	7/23/2018	12033
	SB-EB1	East Branch Salmon Brook	8/6/2018	228
	SB-EB1	East Branch Salmon Brook	8/20/2018	199
	SB-2	Salmon Brook	6/4/2018	3255
	SB-2	Salmon Brook	6/18/2018	216
	SB-2	Salmon Brook	7/9/2018	259
	SB-2	Salmon Brook	7/23/2018	6867
	SB-2	Salmon Brook	8/6/2018	185
	SB-2	Salmon Brook	8/20/2018	305
	SB-WB3	West Branch Salmon Brook	5/21/2018	10
	SB-WB3	West Branch Salmon Brook	6/11/2018	31
	SB-WB3	West Branch Salmon Brook	6/25/2018	3873
	SB-WB3	West Branch Salmon Brook	7/16/2018	134
	SB-WB3	West Branch Salmon Brook	7/30/2018	122
	SB-WB3	West Branch Salmon Brook	8/13/2018	1281

WINDSOR

	Site Number	Stream Name	Collection Date	E.coli colonies/100 mL
	FR-W1	Farmington River	6/4/2018	350
	FR-W1	Farmington River	6/18/2018	31
	FR-W1	Farmington River	7/9/2018	52
	FR-W1	Farmington River	7/23/2018	121
	FR-W1	Farmington River	8/6/2018	262
	FR-W1	Farmington River	8/20/2018	131
	PB-W1	Phelps Brook	6/4/2018	11199
	PB-W1	Phelps Brook	6/18/2018	313
	PB-W1	Phelps Brook	7/9/2018	345
	PB-W1	Phelps Brook	7/23/2018	988
	PB-W1	Phelps Brook	8/6/2018	256
	PB-W1	Phelps Brook	8/20/2018	121
	ML-W1	Mill Brook	6/4/2018	10462
	ML-W1	Mill Brook	6/18/2018	565
	ML-W1	Mill Brook	7/9/2018	256
	ML-W1	Mill Brook	7/23/2018	2613
	ML-W1	Mill Brook	8/6/2018	389
	ML-W1	Mill Brook	8/20/2018	203
	FR-W2	Farmington River	6/4/2018	487
	FR-W2	Farmington River	6/18/2018	63
	FR-W2	Farmington River	7/9/2018	51
	FR-W2	Farmington River	7/23/2018	85
	FR-W2	Farmington River	8/6/2018	175
	FR-W2	Farmington River	8/20/2018	86

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