« Is there sewage in the Chicago River?

History of combined sewer overflows

The Metropolitan Water Reclamation District of Greater Chicago tracks whenever they release raw sewage in to Chicago area rivers. Since January 1st 2007, raw, untreated sewage has been dumped in to rivers on 660 days.

These occurrences are referred to as combined sewer overflow events, or CSOs.

Date	# river segments affected	# sewage outfall locations
Mar, 01 2018	2	2
Feb, 23 2018	2	10
Feb, 21 2018	6	22
Feb, 20 2018	13	177
Nov, 18 2017	7	53
Nov, 17 2017	4	5
Nov, 16 2017	1	1
Nov, 15 2017	1	1
Oct, 25 2017	1	46
Oct, 24 2017	11	96
Oct, 23 2017	10	102
Oct, 22 2017	1	1
Oct, 19 2017	1	1
Oct, 15 2017	9	102
Oct, 14 2017	16	299
Oct, 12 2017	1	2
Oct, 11 2017	7	17
Oct, 10 2017	3	7
Aug, 27 2017	1	2
Aug, 22 2017	1	1
Aug, 21 2017	1	1
Aug, 03 2017	3	5
Jul, 22 2017	10	76
Jul, 21 2017	10	77
Jul, 20 2017	12	78
Jul, 19 2017	1	1
Jul, 13 2017	1	2
Jul, 12 2017	13	109
Jun, 29 2017	7	23
Jun, 28 2017	1	6
Jun, 23 2017	8	37
Jun, 17 2017	2	2
Jun, 14 2017	10	59
May, 28 2017	2	7
May, 26 2017	5	16
May, 25 2017	1	1
May, 24 2017	3	4
May, 23 2017	3	6
May, 18 2017	1	1
May, 16 2017	1	1
May, 13 2017	1	1
May, 12 2017	1	1
May, 11 2017	1	1
May, 10 2017	6	19
May, 02 2017	1	1
May, 01 2017	7	41
Apr, 30 2017	11	132
Apr, 29 2017	15	124
Apr, 16 2017	2	3
Apr, 10 2017	5	7
Apr, 06 2017	9	37
Apr, 05 2017	8	25
Mar, 31 2017	2	5
Mar, 30 2017	16	135
Mar, 26 2017	1	4
Mar, 25 2017	2	4
Mar, 01 2017	2	2
Feb, 28 2017	7	17
Feb, 24 2017	1	2
Feb, 23 2017	1	1
Feb, 07 2017	2	4
Jan, 20 2017	5	24
Jan, 19 2017	3	5
Jan, 18 2017	1	1
Jan, 17 2017	11	51
Jan, 16 2017	1	4
Jan, 11 2017	6	18
Jan, 10 2017	3	7
Dec, 26 2016	1	1
Nov, 30 2016	2	2
Nov, 29 2016	2	3
Nov, 28 2016	4	26
Nov, 24 2016	1	1
Nov, 23 2016	1	2
Nov, 18 2016	1	2
Nov, 09 2016	1	1
Nov, 02 2016	1	3
Oct, 31 2016	1	1
Oct, 30 2016	2	2
Oct, 26 2016	5	16
Oct, 24 2016	1	1
Oct, 17 2016	1	1
Oct, 16 2016	3	5
Oct, 06 2016	1	1
Oct, 01 2016	4	30
Sep, 28 2016	2	2
Sep, 21 2016	4	4
Sep, 08 2016	1	1
Sep, 07 2016	3	3
Aug, 30 2016	7	27
Aug, 29 2016	2	6
Aug, 27 2016	3	3
Aug, 20 2016	11	38
Aug, 19 2016	3	4
Aug, 18 2016	8	11
Aug, 15 2016	2	2
Aug, 13 2016	3	12
Aug, 12 2016	10	45
Jul, 25 2016	1	2
Jul, 24 2016	11	108
Jul, 23 2016	13	89
Jul, 21 2016	5	10
Jul, 18 2016	3	4
Jul, 17 2016	2	3
Jul, 13 2016	2	3
Jul, 07 2016	3	8
Jul, 06 2016	5	12
Jun, 23 2016	1	1
Jun, 22 2016	11	22
Jun, 15 2016	1	1
Jun, 02 2016	4	8
Jun, 01 2016	1	1
May, 31 2016	5	5
May, 27 2016	9	22
May, 26 2016	4	28
May, 25 2016	12	127
May, 14 2016	1	1
May, 13 2016	1	1
May, 12 2016	1	1
May, 10 2016	1	1
May, 09 2016	1	1
May, 02 2016	1	1
May, 01 2016	1	1
Apr, 30 2016	1	1
Apr, 28 2016	1	1
Mar, 24 2016	4	6
Mar, 15 2016	1	1
Feb, 03 2016	2	3
Feb, 02 2016	6	6
Jan, 25 2016	1	1
Jan, 14 2016	1	1
Jan, 09 2016	1	1
Jan, 08 2016	3	5
Dec, 30 2015	1	1
Dec, 29 2015	3	3
Dec, 28 2015	3	3
Dec, 23 2015	4	8
Dec, 14 2015	2	3
Dec, 13 2015	1	1
Nov, 27 2015	5	7
Nov, 21 2015	1	1
Nov, 18 2015	1	1
Nov, 17 2015	1	1
Oct, 24 2015	5	15
Sep, 19 2015	15	69
Sep, 18 2015	14	83
Sep, 17 2015	1	1
Sep, 12 2015	1	1
Sep, 09 2015	1	1
Sep, 08 2015	8	15
Aug, 19 2015	6	6
Aug, 18 2015	12	193
Aug, 17 2015	9	132
Aug, 16 2015	1	28
Aug, 15 2015	1	1
Aug, 06 2015	2	2
Aug, 04 2015	1	1
Aug, 03 2015	6	7
Aug, 02 2015	6	65
Aug, 01 2015	1	8
Jul, 13 2015	2	4
Jul, 07 2015	1	1
Jun, 22 2015	1	1
Jun, 20 2015	2	2
Jun, 19 2015	3	3
Jun, 18 2015	6	45
Jun, 17 2015	7	31
Jun, 16 2015	13	80
Jun, 15 2015	19	1324
Jun, 14 2015	11	54
Jun, 13 2015	2	34
Jun, 08 2015	1	1
May, 09 2015	1	1
May, 05 2015	2	2
Apr, 10 2015	1	1
Apr, 09 2015	8	33
Nov, 24 2014	1	1
Nov, 22 2014	1	1
Oct, 15 2014	7	17
Oct, 14 2014	8	19
Oct, 04 2014	1	1
Oct, 03 2014	4	4
Sep, 21 2014	1	1
Sep, 11 2014	2	4
Sep, 10 2014	7	20
Aug, 26 2014	6	16
Aug, 25 2014	7	32
Aug, 24 2014	5	8
Aug, 23 2014	11	43
Aug, 22 2014	10	35
Aug, 21 2014	3	5
Aug, 20 2014	1	1
Aug, 12 2014	1	1
Aug, 05 2014	11	48
Aug, 04 2014	9	45
Jul, 25 2014	1	5
Jul, 23 2014	1	1
Jul, 22 2014	1	1
Jul, 16 2014	1	1
Jul, 15 2014	1	2
Jul, 14 2014	8	13
Jul, 13 2014	15	60
Jul, 12 2014	13	61
Jul, 08 2014	1	1
Jul, 07 2014	2	2
Jul, 02 2014	6	18
Jul, 01 2014	14	49
Jun, 30 2014	10	39
Jun, 25 2014	6	10
Jun, 24 2014	11	58
Jun, 23 2014	5	7
Jun, 22 2014	6	6
Jun, 21 2014	12	75
Jun, 20 2014	3	5
Jun, 19 2014	3	15
Jun, 18 2014	2	2
Jun, 11 2014	2	2
Jun, 10 2014	1	1
May, 28 2014	1	1
May, 21 2014	4	11
May, 20 2014	7	17
May, 15 2014	2	4
May, 13 2014	13	34
May, 12 2014	9	29
May, 11 2014	9	25
May, 10 2014	2	2
May, 09 2014	8	40
Apr, 29 2014	1	2
Apr, 09 2014	1	1
Apr, 04 2014	1	3
Apr, 03 2014	9	14
Mar, 12 2014	1	1
Feb, 22 2014	1	1
Feb, 21 2014	11	33
Feb, 20 2014	15	63
Jan, 26 2014	1	1
Jan, 25 2014	1	1
Jan, 14 2014	1	1
Jan, 13 2014	2	2
Jan, 12 2014	2	3
Jan, 11 2014	9	32
Jan, 10 2014	9	25
Jan, 03 2014	1	2
Dec, 20 2013	1	3
Dec, 19 2013	1	3
Dec, 15 2013	1	1
Dec, 14 2013	1	1
Dec, 13 2013	1	1
Dec, 12 2013	1	1
Dec, 11 2013	1	1
Dec, 10 2013	1	1
Dec, 09 2013	1	1
Dec, 08 2013	1	1
Dec, 07 2013	1	1
Dec, 06 2013	1	1
Dec, 05 2013	2	2
Dec, 04 2013	2	2
Dec, 03 2013	2	2
Dec, 02 2013	2	2
Dec, 01 2013	2	2
Nov, 30 2013	2	2
Nov, 29 2013	2	2
Nov, 28 2013	2	2
Nov, 27 2013	2	2
Nov, 26 2013	2	2
Nov, 25 2013	2	2
Nov, 24 2013	2	2
Nov, 23 2013	2	2
Nov, 22 2013	2	2
Nov, 21 2013	2	2
Nov, 20 2013	2	2
Nov, 19 2013	2	2
Nov, 18 2013	2	3
Nov, 17 2013	12	67
Nov, 16 2013	1	1
Nov, 15 2013	1	1
Nov, 14 2013	1	1
Nov, 13 2013	1	1
Nov, 12 2013	1	1
Nov, 11 2013	1	1
Nov, 10 2013	2	2
Nov, 09 2013	2	3
Nov, 08 2013	1	1
Nov, 07 2013	1	1
Nov, 06 2013	2	2
Nov, 05 2013	1	1
Nov, 04 2013	1	1
Nov, 03 2013	1	1
Nov, 02 2013	1	1
Nov, 01 2013	4	5
Oct, 31 2013	12	118
Oct, 30 2013	1	1
Oct, 05 2013	9	33
Sep, 20 2013	2	3
Sep, 19 2013	8	53
Sep, 18 2013	8	71
Sep, 15 2013	1	1
Aug, 31 2013	4	12
Aug, 30 2013	3	6
Aug, 02 2013	3	3
Jul, 31 2013	1	1
Jul, 20 2013	2	2
Jul, 19 2013	2	3
Jul, 15 2013	2	2
Jul, 08 2013	2	2
Jun, 28 2013	4	10
Jun, 27 2013	8	31
Jun, 26 2013	11	59
Jun, 21 2013	2	5
Jun, 12 2013	2	2
Jun, 10 2013	2	2
Jun, 02 2013	8	12
Jun, 01 2013	12	53
May, 31 2013	11	45
May, 30 2013	7	20
May, 29 2013	8	24
May, 28 2013	11	42
May, 23 2013	4	20
May, 22 2013	14	108
May, 21 2013	13	53
May, 20 2013	4	11
May, 10 2013	1	1
May, 09 2013	1	1
Apr, 25 2013	2	3
Apr, 24 2013	6	18
Apr, 23 2013	8	31
Apr, 22 2013	4	8
Apr, 21 2013	8	11
Apr, 20 2013	10	30
Apr, 19 2013	20	58
Apr, 18 2013	24	227
Apr, 17 2013	15	115
Apr, 12 2013	1	2
Apr, 11 2013	12	62
Apr, 10 2013	2	5
Apr, 08 2013	3	4
Mar, 12 2013	5	12
Mar, 11 2013	15	40
Mar, 10 2013	16	67
Jan, 31 2013	2	2
Jan, 30 2013	13	80
Jan, 29 2013	12	60
Jan, 27 2013	1	1
Jan, 11 2013	1	1
Jan, 10 2013	1	1
Dec, 21 2012	4	7
Dec, 20 2012	6	14
Oct, 23 2012	3	5
Sep, 17 2012	1	1
Sep, 04 2012	2	2
Aug, 27 2012	10	28
Aug, 26 2012	13	71
Aug, 13 2012	1	2
Aug, 10 2012	3	4
Aug, 04 2012	5	13
Jul, 26 2012	2	4
Jul, 24 2012	4	12
Jul, 20 2012	1	3
Jul, 19 2012	14	65
Jul, 18 2012	3	5
Jul, 13 2012	2	2
Jul, 01 2012	2	4
May, 08 2012	2	5
May, 07 2012	14	67
May, 06 2012	6	43
May, 04 2012	12	38
May, 03 2012	6	27
Apr, 16 2012	7	20
Apr, 15 2012	11	70
Mar, 24 2012	3	3
Mar, 23 2012	11	60
Mar, 22 2012	1	1
Mar, 08 2012	1	1
Jan, 23 2012	2	2
Dec, 14 2011	2	2
Nov, 27 2011	2	2
Nov, 26 2011	2	2
Nov, 09 2011	8	29
Nov, 08 2011	8	13
Sep, 28 2011	3	9
Sep, 27 2011	4	17
Sep, 26 2011	8	28
Sep, 03 2011	6	12
Aug, 09 2011	1	1
Aug, 08 2011	3	5
Aug, 07 2011	5	17
Aug, 03 2011	4	6
Aug, 02 2011	8	21
Jul, 30 2011	3	6
Jul, 29 2011	14	131
Jul, 28 2011	11	45
Jul, 27 2011	4	9
Jul, 25 2011	2	3
Jul, 24 2011	15	46
Jul, 23 2011	20	149
Jul, 22 2011	8	33
Jul, 20 2011	2	3
Jul, 11 2011	4	6
Jun, 30 2011	1	1
Jun, 20 2011	3	4
Jun, 16 2011	5	9
Jun, 15 2011	5	16
Jun, 12 2011	1	1
Jun, 11 2011	6	9
Jun, 10 2011	16	54
Jun, 09 2011	17	111
Jun, 01 2011	1	1
May, 31 2011	2	2
May, 30 2011	6	21
May, 29 2011	17	175
May, 28 2011	5	11
May, 27 2011	2	4
May, 26 2011	15	61
May, 25 2011	12	115
May, 15 2011	1	4
May, 14 2011	1	1
Apr, 28 2011	4	8
Apr, 27 2011	13	47
Apr, 26 2011	15	83
Apr, 23 2011	7	15
Apr, 22 2011	15	76
Apr, 21 2011	2	7
Apr, 20 2011	8	31
Apr, 19 2011	14	85
Apr, 08 2011	2	4
Mar, 23 2011	1	1
Mar, 22 2011	1	1
Mar, 20 2011	1	1
Mar, 05 2011	8	30
Mar, 04 2011	11	34
Feb, 27 2011	2	3
Feb, 22 2011	1	1
Feb, 21 2011	8	17
Feb, 20 2011	9	18
Jan, 01 2011	3	5
Dec, 31 2010	15	40
Nov, 29 2010	1	1
Nov, 23 2010	5	13
Nov, 22 2010	12	88
Oct, 25 2010	1	1
Oct, 24 2010	1	1
Sep, 03 2010	6	10
Sep, 02 2010	8	63
Aug, 09 2010	2	2
Aug, 08 2010	1	2
Aug, 07 2010	1	1
Aug, 05 2010	4	10
Aug, 04 2010	17	109
Aug, 03 2010	11	30
Aug, 01 2010	1	1
Jul, 31 2010	15	60
Jul, 26 2010	16	95
Jul, 25 2010	18	109
Jul, 24 2010	23	178
Jul, 23 2010	8	36
Jul, 11 2010	3	4
Jul, 08 2010	1	1
Jul, 06 2010	1	1
Jun, 28 2010	5	14
Jun, 27 2010	15	67
Jun, 26 2010	13	76
Jun, 25 2010	5	7
Jun, 24 2010	14	37
Jun, 23 2010	16	130
Jun, 22 2010	2	3
Jun, 21 2010	2	3
Jun, 19 2010	9	21
Jun, 18 2010	8	35
Jun, 16 2010	6	14
Jun, 15 2010	10	41
Jun, 14 2010	1	1
Jun, 06 2010	3	4
Jun, 05 2010	8	23
Jun, 03 2010	3	6
Jun, 02 2010	17	152
Jun, 01 2010	4	7
May, 31 2010	7	25
May, 14 2010	4	37
May, 13 2010	15	156
May, 11 2010	1	1
May, 07 2010	3	3
May, 02 2010	3	5
Apr, 08 2010	2	2
Apr, 07 2010	9	26
Apr, 06 2010	6	61
Apr, 05 2010	10	51
Apr, 04 2010	4	16
Mar, 13 2010	1	1
Mar, 11 2010	1	1
Feb, 10 2010	1	1
Dec, 26 2009	2	9
Dec, 25 2009	15	91
Dec, 24 2009	1	2
Dec, 09 2009	1	1
Nov, 24 2009	2	3
Nov, 02 2009	1	1
Nov, 01 2009	2	2
Oct, 31 2009	8	16
Oct, 30 2009	17	217
Oct, 29 2009	2	3
Oct, 27 2009	1	2
Oct, 26 2009	9	22
Oct, 25 2009	6	11
Oct, 24 2009	6	13
Oct, 23 2009	17	145
Oct, 22 2009	7	19
Sep, 27 2009	1	1
Sep, 20 2009	1	1
Aug, 28 2009	10	32
Aug, 27 2009	11	85
Aug, 26 2009	2	2
Aug, 21 2009	1	2
Aug, 20 2009	1	1
Aug, 19 2009	4	5
Aug, 18 2009	1	1
Aug, 17 2009	9	39
Aug, 16 2009	4	5
Jul, 23 2009	3	6
Jul, 11 2009	3	5
Jun, 25 2009	2	2
Jun, 24 2009	6	37
Jun, 22 2009	2	2
Jun, 21 2009	2	3
Jun, 20 2009	10	26
Jun, 19 2009	14	123
Jun, 18 2009	5	9
Jun, 17 2009	9	26
Jun, 16 2009	12	61
Jun, 11 2009	1	2
Jun, 01 2009	3	4
May, 28 2009	3	3
May, 27 2009	10	21
May, 26 2009	10	20
May, 16 2009	1	1
May, 15 2009	3	3
May, 14 2009	9	24
May, 13 2009	5	14
May, 07 2009	4	21
May, 06 2009	5	11
May, 02 2009	1	1
May, 01 2009	3	5
Apr, 30 2009	13	61
Apr, 28 2009	14	59
Apr, 27 2009	15	65
Apr, 26 2009	5	18
Apr, 25 2009	3	10
Apr, 07 2009	2	4
Apr, 06 2009	4	6
Apr, 01 2009	2	3
Mar, 31 2009	9	13
Mar, 30 2009	1	1
Mar, 29 2009	9	41
Mar, 13 2009	1	1
Mar, 12 2009	3	6
Mar, 11 2009	11	20
Mar, 10 2009	16	117
Mar, 09 2009	13	35
Mar, 08 2009	19	179
Mar, 07 2009	11	88
Feb, 28 2009	2	3
Feb, 27 2009	14	61
Feb, 26 2009	15	96
Feb, 13 2009	1	1
Feb, 12 2009	1	1
Feb, 11 2009	3	3
Dec, 30 2008	1	1
Dec, 29 2008	5	5
Dec, 28 2008	14	34
Dec, 27 2008	19	167
Dec, 13 2008	1	1
Dec, 10 2008	1	1
Dec, 09 2008	6	18
Oct, 08 2008	4	9
Oct, 07 2008	3	8
Sep, 19 2008	1	3
Sep, 18 2008	2	2
Sep, 17 2008	5	11
Sep, 16 2008	12	28
Sep, 15 2008	20	59
Sep, 14 2008	24	121
Sep, 13 2008	22	293
Sep, 08 2008	5	32
Sep, 05 2008	10	19
Sep, 04 2008	19	106
Aug, 23 2008	1	1
Aug, 06 2008	1	1
Aug, 05 2008	10	28
Aug, 04 2008	12	113
Aug, 01 2008	1	2
Jul, 31 2008	1	1
Jul, 22 2008	1	1
Jul, 21 2008	2	4
Jul, 20 2008	10	79
Jul, 19 2008	10	36
Jul, 12 2008	4	11
Jul, 10 2008	1	1
Jul, 08 2008	1	2
Jun, 13 2008	1	2
Jun, 09 2008	9	54
Jun, 08 2008	1	1
Jun, 05 2008	5	16
Jun, 03 2008	3	3
May, 12 2008	1	3
May, 11 2008	8	27
Apr, 25 2008	2	2
Apr, 11 2008	4	7
Apr, 10 2008	8	28
Apr, 08 2008	2	3
Mar, 03 2008	1	1
Feb, 18 2008	5	24
Feb, 17 2008	14	65
Jan, 11 2008	1	2
Jan, 10 2008	5	17
Jan, 09 2008	5	15
Jan, 08 2008	14	72
Nov, 21 2007	1	1
Sep, 25 2007	3	4
Sep, 10 2007	1	1
Aug, 27 2007	3	3
Aug, 26 2007	4	6
Aug, 25 2007	15	49
Aug, 24 2007	18	112
Aug, 23 2007	19	268
Aug, 22 2007	9	52
Aug, 21 2007	2	3
Aug, 20 2007	17	128
Aug, 19 2007	12	91
Aug, 15 2007	3	4
Aug, 09 2007	4	6
Aug, 08 2007	3	5
Aug, 07 2007	8	69
Aug, 06 2007	1	1
Aug, 05 2007	11	44
Jul, 27 2007	3	4
Jul, 26 2007	12	25
Jul, 19 2007	7	28
Jul, 18 2007	11	35
Jul, 10 2007	3	4
Jul, 04 2007	5	8
Jun, 27 2007	5	15
Jun, 26 2007	4	16
Jun, 13 2007	1	1
May, 26 2007	3	4
Apr, 30 2007	2	2
Apr, 28 2007	4	9
Apr, 27 2007	6	12
Apr, 26 2007	13	68
Apr, 25 2007	14	55
Apr, 13 2007	1	1
Apr, 12 2007	5	8
Apr, 11 2007	1	1
Mar, 31 2007	2	2
Mar, 28 2007	1	1
Mar, 22 2007	1	2
Mar, 21 2007	4	5
Mar, 01 2007	9	19
Feb, 25 2007	1	1
Jan, 06 2007	1	3
Jan, 05 2007	7	14
Jan, 04 2007	11	24