California · California (CIWQS)

Whittier City

Frequently reaches water

Reported events

334

Total volume

106K gal

Reached waterways

104 (31%)

Reporting since

2007

What caused the overflows

Root Intrusion

207

Other / Unknown

Equipment Failure

Grease / FOG

Reported overflow events (showing 200 of 334)

Date	Volume	Cause	Reached water	Receiving water
Sep 27, 2025	300 gal	Root Intrusion	—	Coyote Creek
Apr 19, 2025	850 gal	Root Intrusion	—	Coyote Creek
Dec 2, 2024	150 gal	Root Intrusion	Yes	Coyote Creek
Nov 21, 2024	3K gal	Equipment Failure	Yes	Coyote Creek
Sep 23, 2024	250 gal	Root Intrusion	Yes	Coyote Creek
Aug 21, 2024	200 gal	Equipment Failure	—	Coyote Creek
Dec 19, 2023	100 gal	Equipment Failure	—	—
Dec 7, 2023	100 gal	Other / Unknown	Yes	—
Jun 15, 2023	225 gal	Other / Unknown	Yes	—
Apr 8, 2023	250 gal	Root Intrusion	Yes	Separate Storm Drain
Feb 20, 2023	100 gal	Root Intrusion	—	Building or Structure
Jan 13, 2023	225 gal	Equipment Failure	Yes	Separate Storm Drain
Jan 7, 2023	200 gal	Root Intrusion	Yes	Separate Storm Drain
Dec 6, 2022	20 gal	Root Intrusion	—	Unpaved surface
Nov 10, 2022	90 gal	Root Intrusion	Yes	Separate Storm Drain
Nov 5, 2022	40 gal	Root Intrusion	—	Unpaved surface
Oct 31, 2022	25 gal	Root Intrusion	—	Unpaved surface
Oct 3, 2022	75 gal	Root Intrusion	Yes	Separate Storm Drain
Sep 26, 2022	200 gal	Equipment Failure	Yes	Separate Storm Drain
Sep 11, 2022	5 gal	Root Intrusion	—	Building or Structure;Unpaved surface
Aug 31, 2022	900 gal	Equipment Failure	—	Unpaved surface
Jun 7, 2022	25 gal	Equipment Failure	Yes	Separate Storm Drain
Jun 5, 2022	35 gal	Root Intrusion	Yes	Separate Storm Drain
May 3, 2022	20 gal	Root Intrusion	Yes	Separate Storm Drain
Apr 18, 2022	250 gal	Root Intrusion	Yes	Separate Storm Drain
Mar 6, 2022	400 gal	Root Intrusion	Yes	Separate Storm Drain
Feb 26, 2022	30 gal	Other / Unknown	Yes	Street/Curb and Gutter
Jan 17, 2022	350 gal	Other / Unknown	Yes	Separate Storm Drain
Aug 24, 2021	2K gal	Root Intrusion	Yes	Separate Storm Drain
May 23, 2021	650 gal	Equipment Failure	Yes	Separate Storm Drain
May 3, 2021	2K gal	Equipment Failure	Yes	Separate Storm Drain
Mar 17, 2021	525 gal	Equipment Failure	Yes	Separate Storm Drain
Mar 17, 2021	525 gal	Equipment Failure	Yes	Separate Storm Drain
Mar 13, 2021	200 gal	Equipment Failure	Yes	Separate Storm Drain
Mar 1, 2021	325 gal	Root Intrusion	Yes	Separate Storm Drain
Jan 30, 2021	200 gal	Root Intrusion	Yes	Separate Storm Drain
Jan 2, 2021	325 gal	Root Intrusion	Yes	Separate Storm Drain
Nov 21, 2020	200 gal	Root Intrusion	Yes	Separate Storm Drain
Oct 6, 2020	50 gal	Root Intrusion	—	Unpaved surface
Oct 1, 2020	50 gal	Root Intrusion	—	Unpaved surface
May 4, 2020	250 gal	Root Intrusion	Yes	Separate Storm Drain
Mar 23, 2020	250 gal	Root Intrusion	—	Building or Structure;Unpaved surface
Mar 17, 2020	225 gal	Root Intrusion	Yes	Separate Storm Drain
Nov 25, 2019	625 gal	Root Intrusion	Yes	Paved Surface;Separate Storm Drain
Nov 7, 2019	250 gal	Root Intrusion	Yes	Separate Storm Drain
Jun 25, 2019	750 gal	Root Intrusion	Yes	Separate Storm Drain
May 6, 2019	250 gal	Root Intrusion	Yes	Separate Storm Drain
Mar 28, 2019	260 gal	Root Intrusion	Yes	Separate Storm Drain;Unpaved surface
Mar 10, 2019	225 gal	Root Intrusion	Yes	Separate Storm Drain
Jan 21, 2019	400 gal	Root Intrusion	Yes	Paved Surface
Dec 12, 2018	450 gal	Root Intrusion	Yes	Separate Storm Drain
Dec 9, 2018	225 gal	Root Intrusion	—	Unpaved surface
Nov 14, 2018	425 gal	Root Intrusion	Yes	Building or Structure;Separate Storm Drain
Nov 13, 2018	312 gal	Root Intrusion	—	Unpaved surface
Oct 14, 2018	90 gal	Root Intrusion	Yes	Separate Storm Drain;Unpaved surface
Sep 1, 2018	500 gal	Root Intrusion	—	Building or Structure;Unpaved surface
May 21, 2018	700 gal	Root Intrusion	—	Building or Structure;Unpaved surface
Apr 7, 2018	325 gal	Equipment Failure	Yes	Separate Storm Drain
Mar 6, 2018	65 gal	Root Intrusion	—	Building or Structure;Unpaved surface
Feb 18, 2018	820 gal	Equipment Failure	—	Building or Structure;Unpaved surface
Dec 27, 2017	70 gal	Root Intrusion	Yes	Separate Storm Drain
Oct 21, 2017	840 gal	Grease / FOG	—	Drainage Channel
Jun 11, 2017	400 gal	Root Intrusion	—	Unpaved surface
May 18, 2017	350 gal	Equipment Failure	—	Building or Structure;Unpaved surface
Apr 25, 2017	770 gal	Root Intrusion	Yes	Separate Storm Drain
Feb 24, 2017	260 gal	Equipment Failure	Yes	Separate Storm Drain
Feb 21, 2017	400 gal	Equipment Failure	Yes	Separate Storm Drain
Dec 6, 2016	3K gal	Equipment Failure	Yes	Separate Storm Drain
Oct 28, 2016	235 gal	Root Intrusion	Yes	Separate Storm Drain
Oct 7, 2016	2K gal	Root Intrusion	Yes	Separate Storm Drain
Aug 21, 2016	200 gal	Root Intrusion	Yes	Separate Storm Drain;Street/Curb and Gutter
Jun 24, 2016	75 gal	Equipment Failure	Yes	Separate Storm Drain
May 25, 2016	40 gal	Equipment Failure	Yes	Separate Storm Drain
Apr 26, 2016	350 gal	Root Intrusion	—	Building or Structure;Unpaved surface
Apr 2, 2016	475 gal	Root Intrusion	—	Unpaved surface
Mar 7, 2016	750 gal	Root Intrusion	Yes	Separate Storm Drain
Feb 20, 2016	50 gal	Root Intrusion	Yes	Separate Storm Drain
Jan 23, 2016	200 gal	Equipment Failure	Yes	Separate Storm Drain
Jan 1, 2016	400 gal	Equipment Failure	Yes	Separate Storm Drain;Unpaved surface
Dec 17, 2015	245 gal	Grease / FOG	Yes	Separate Storm Drain
Nov 23, 2015	500 gal	Root Intrusion	—	Unpaved surface
Nov 15, 2015	50 gal	Root Intrusion	—	Unpaved surface
Nov 3, 2015	250 gal	Root Intrusion	Yes	Separate Storm Drain
Nov 1, 2015	315 gal	Root Intrusion	Yes	Building or Structure;Separate Storm Drain
Oct 21, 2015	125 gal	Root Intrusion	Yes	Separate Storm Drain
Aug 9, 2015	86 gal	Root Intrusion	Yes	Separate Storm Drain
Jul 25, 2015	800 gal	Root Intrusion	Yes	Separate Storm Drain
Jul 19, 2015	40 gal	Root Intrusion	—	Unpaved surface
Jul 8, 2015	50 gal	Grease / FOG	—	Building or Structure
Jul 5, 2015	2K gal	Root Intrusion	Yes	Separate Storm Drain;Street/Curb and Gutter
Jun 18, 2015	50 gal	Root Intrusion	—	Street/Curb and Gutter
Jun 18, 2015	100 gal	Root Intrusion	Yes	Separate Storm Drain;Street/Curb and Gutter
Jun 17, 2015	120 gal	Root Intrusion	—	Paved Surface
Jun 11, 2015	200 gal	Root Intrusion	Yes	Separate Storm Drain
Jun 6, 2015	360 gal	Root Intrusion	—	Other (specify below)
Apr 7, 2015	980 gal	Root Intrusion	Yes	Separate Storm Drain
Mar 22, 2015	50 gal	Root Intrusion	—	Unpaved surface
Mar 13, 2015	225 gal	Root Intrusion	Yes	Separate Storm Drain
Mar 4, 2015	1K gal	Other / Unknown	Yes	Separate Storm Drain
Mar 3, 2015	750 gal	Root Intrusion	Yes	Separate Storm Drain
Feb 24, 2015	500 gal	Grease / FOG	Yes	Separate Storm Drain
Feb 22, 2015	100 gal	Grease / FOG	—	Unpaved surface
Feb 20, 2015	125 gal	Equipment Failure	Yes	Paved Surface;Separate Storm Drain
Jan 11, 2015	175 gal	Other / Unknown	Yes	Separate Storm Drain
Jan 11, 2015	125 gal	Grease / FOG	Yes	Separate Storm Drain
Jan 9, 2015	100 gal	Root Intrusion	Yes	Separate Storm Drain
Jan 4, 2015	80 gal	Equipment Failure	—	Building or Structure
Jan 1, 2015	64 gal	Equipment Failure	—	Unpaved surface
Dec 28, 2014	100 gal	Grease / FOG	—	Other (specify below)
Dec 26, 2014	855 gal	Root Intrusion	—	Building or Structure
Dec 25, 2014	15 gal	Root Intrusion	—	Other (specify below)
Dec 25, 2014	60 gal	Root Intrusion	—	Unpaved surface
Dec 6, 2014	3K gal	Equipment Failure	Yes	Separate Storm Drain
Dec 2, 2014	375 gal	Root Intrusion	—	Building or Structure
Nov 29, 2014	175 gal	Other / Unknown	Yes	Separate Storm Drain
Nov 27, 2014	38 gal	Equipment Failure	—	Other (specify below)
Nov 26, 2014	2K gal	Equipment Failure	Yes	Separate Storm Drain
Nov 14, 2014	60 gal	Root Intrusion	—	Separate Storm Drain
Nov 12, 2014	100 gal	Root Intrusion	Yes	Unpaved surface
Nov 12, 2014	225 gal	Root Intrusion	—	Unpaved surface
Nov 12, 2014	500 gal	Other / Unknown	Yes	Separate Storm Drain
Nov 10, 2014	150 gal	Root Intrusion	—	Unpaved surface
Nov 6, 2014	520 gal	Root Intrusion	Yes	Separate Storm Drain
Nov 3, 2014	850 gal	Other / Unknown	Yes	Separate Storm Drain;Unpaved surface
Oct 31, 2014	450 gal	Other / Unknown	Yes	Separate Storm Drain;Unpaved surface
Oct 29, 2014	80 gal	Equipment Failure	Yes	Separate Storm Drain
Oct 7, 2014	92 gal	Root Intrusion	Yes	Separate Storm Drain
Sep 26, 2014	75 gal	Root Intrusion	Yes	Separate Storm Drain
Sep 15, 2014	500 gal	Other / Unknown	Yes	Separate Storm Drain
Aug 31, 2014	100 gal	Equipment Failure	Yes	Separate Storm Drain
Aug 21, 2014	130 gal	Root Intrusion	Yes	Separate Storm Drain
Aug 17, 2014	75 gal	Other / Unknown	Yes	Separate Storm Drain
Aug 16, 2014	225 gal	Root Intrusion	Yes	Separate Storm Drain
Jun 23, 2014	555 gal	Root Intrusion	Yes	Separate Storm Drain
Jun 7, 2014	2K gal	Root Intrusion	Yes	Separate Storm Drain
May 11, 2014	537 gal	Root Intrusion	—	Street/Curb and Gutter;Unpaved surface
Apr 25, 2014	125 gal	Equipment Failure	Yes	Separate Storm Drain
Apr 11, 2014	850 gal	Other / Unknown	Yes	Separate Storm Drain;Street/Curb and Gutter
Feb 5, 2014	95 gal	Root Intrusion	—	Street/Curb and Gutter
Feb 1, 2014	925 gal	Root Intrusion	Yes	Separate Storm Drain
Jan 31, 2014	690 gal	Other / Unknown	Yes	Separate Storm Drain
Jan 24, 2014	60 gal	Other / Unknown	Yes	Separate Storm Drain
Jan 16, 2014	105 gal	Grease / FOG	Yes	Separate Storm Drain
Jan 7, 2014	175 gal	Root Intrusion	Yes	Separate Storm Drain
Jan 5, 2014	900 gal	Equipment Failure	Yes	Separate Storm Drain
Jan 2, 2014	150 gal	Root Intrusion	—	Paved Surface;Unpaved surface
Dec 4, 2013	40 gal	Root Intrusion	Yes	Separate Storm Drain
Nov 24, 2013	400 gal	Root Intrusion	—	Unpaved surface
Nov 12, 2013	1K gal	Other / Unknown	Yes	Other (specify below);Separate Storm Drain
Nov 5, 2013	144 gal	Grease / FOG	Yes	Separate Storm Drain
Nov 5, 2013	144 gal	Other / Unknown	Yes	Separate Storm Drain
Oct 1, 2013	140 gal	Root Intrusion	—	Other (specify below)
Sep 29, 2013	125 gal	Root Intrusion	Yes	Separate Storm Drain
Aug 23, 2013	160 gal	Grease / FOG	—	Separate storm drain
Aug 2, 2013	250 gal	Other / Unknown	—	Separate storm drain;Other (specify below)
Jun 26, 2013	200 gal	Other / Unknown	—	Separate storm drain
May 24, 2013	110 gal	Other / Unknown	—	Separate storm drain;Street/curb and gutter
May 22, 2013	800 gal	Root Intrusion	—	Separate storm drain;Unpaved surface
May 9, 2013	50 gal	Root Intrusion	—	Separate storm drain
Apr 23, 2013	50 gal	Other / Unknown	—	Separate storm drain;Other (specify below)
Apr 14, 2013	500 gal	Root Intrusion	—	Separate storm drain
Mar 26, 2013	2K gal	Root Intrusion	—	Separate storm drain;Street/curb and gutter
Feb 7, 2013	215 gal	Root Intrusion	—	Separate storm drain
Jan 10, 2013	450 gal	Root Intrusion	—	Separate storm drain
Dec 30, 2012	170 gal	Other / Unknown	—	Separate storm drain;Other (specify below)
Dec 2, 2012	100 gal	Root Intrusion	—	Separate storm drain
Nov 25, 2012	200 gal	Other / Unknown	—	Other (specify below)
Nov 20, 2012	650 gal	Root Intrusion	—	Separate storm drain
Nov 6, 2012	160 gal	Root Intrusion	—	Other (specify below)
Nov 5, 2012	20 gal	Root Intrusion	—	Separate storm drain
Nov 5, 2012	180 gal	Root Intrusion	—	Other (specify below)
Oct 31, 2012	800 gal	Root Intrusion	—	Unpaved surface
Oct 26, 2012	25 gal	Root Intrusion	—	Other (specify below)
Oct 19, 2012	200 gal	Root Intrusion	—	Separate storm drain
Sep 10, 2012	30 gal	Equipment Failure	—	Separate storm drain;Street/curb and gutter
Aug 15, 2012	25 gal	Root Intrusion	—	Separate storm drain;Street/curb and gutter
Aug 4, 2012	100 gal	Grease / FOG	—	Separate storm drain;Street/curb and gutter
Jun 19, 2012	1K gal	Root Intrusion	—	Separate storm drain;Street/curb and gutter
Jun 8, 2012	3K gal	Root Intrusion	—	Street/curb and gutter
May 22, 2012	525 gal	Root Intrusion	—	Separate storm drain;Street/curb and gutter
Apr 19, 2012	450 gal	Equipment Failure	—	Other paved surface;Separate storm drain;Street/curb and gutter
Apr 15, 2012	100 gal	Other / Unknown	—	Separate storm drain
Apr 7, 2012	80 gal	Root Intrusion	—	Separate storm drain;Street/curb and gutter
Mar 25, 2012	450 gal	Root Intrusion	—	Separate storm drain
Mar 18, 2012	100 gal	Root Intrusion	—	Separate storm drain;Street/curb and gutter
Mar 9, 2012	20 gal	Other / Unknown	—	Separate storm drain
Mar 6, 2012	5 gal	Root Intrusion	—	Other (specify below)
Feb 4, 2012	80 gal	Root Intrusion	—	Separate storm drain
Jan 30, 2012	275 gal	Root Intrusion	—	Unpaved surface
Jan 22, 2012	120 gal	Root Intrusion	—	Separate storm drain
Jan 4, 2012	312 gal	Root Intrusion	—	Street/curb and gutter
Jan 1, 2012	100 gal	Root Intrusion	—	Separate storm drain
Dec 25, 2011	25 gal	Root Intrusion	—	Separate storm drain
Dec 21, 2011	100 gal	Root Intrusion	—	Separate storm drain;Street/curb and gutter
Nov 25, 2011	15 gal	Root Intrusion	—	Separate storm drain
Oct 13, 2011	50 gal	Other / Unknown	—	Separate storm drain;Street/curb and gutter
Sep 27, 2011	70 gal	Other / Unknown	—	Separate storm drain;Street/curb and gutter
Sep 21, 2011	50 gal	Root Intrusion	—	Separate storm drain
Aug 24, 2011	100 gal	Other / Unknown	—	Separate storm drain;Street/curb and gutter
Aug 6, 2011	300 gal	Other / Unknown	—	Separate storm drain

Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.