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California · California (CIWQS)

Pomona City

D
Frequently reaches water
Reported events
46
Total volume
185K gal
Reached waterways
21 (46%)
Reporting since
2007

What caused the overflows

Root Intrusion
19
Equipment Failure
15
Other / Unknown
7
Grease / FOG
5

Reported overflow events (showing 46 of 46)

DateVolumeCauseReached waterReceiving water
May 28, 20269K galEquipment FailureYesThompson Wash, Thompson Creek, San Gabriel River Watershed.
Sep 5, 20252K galEquipment FailureYesChino Creek Channel, Santa Ana River, Prado Dam.
Feb 23, 2025400 galGrease / FOG——
Sep 12, 2023198 galRoot Intrusion——
May 11, 202345K galGrease / FOGYesDrainage Channel;Surface Water
Jan 23, 20234K galGrease / FOG—Street/Curb and Gutter
Feb 17, 2022580 galRoot Intrusion—Paved Surface;Street/Curb and Gutter;Unpaved surface
Jan 14, 20224K galOther / Unknown—Paved Surface;Street/Curb and Gutter;Unpaved surface
Jan 3, 20226 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
Dec 1, 2021150 galOther / UnknownYesPaved Surface;Separate Storm Drain;Street/Curb and Gutter
Oct 14, 20211K galEquipment FailureYesPaved Surface
Nov 27, 20205K galEquipment FailureYesDrainage Channel;Paved Surface;Street/Curb and Gutter
Nov 6, 202014K galRoot IntrusionYesDrainage Channel
Oct 22, 20209K galRoot IntrusionYesDrainage Channel
Jun 21, 202021K galRoot IntrusionYesDrainage Channel;Separate Storm Drain
Nov 8, 20183K galRoot IntrusionYesDrainage Channel
May 3, 201848 galRoot Intrusion—Paved Surface
Mar 1, 2017800 galGrease / FOG—Unpaved surface
Feb 4, 2017940 galRoot IntrusionYesDrainage Channel
Jan 1, 201718K galOther / UnknownYesDrainage Channel
Dec 26, 20168K galEquipment FailureYesDrainage Channel
Jul 15, 2016150 galEquipment FailureYesSeparate Storm Drain;Surface Water
Jul 18, 20155 galEquipment Failure—Separate Storm Drain;Street/Curb and Gutter
May 26, 2014900 galRoot Intrusion—Separate Storm Drain
Nov 26, 2012240 galRoot Intrusion—Unpaved surface
Oct 4, 2010200 galRoot Intrusion—Street/curb and gutter
Jan 15, 2010120 galOther / Unknown—Street/curb and gutter
Jul 15, 2009400 galRoot Intrusion—Street/curb and gutter
Jul 13, 2009800 galRoot Intrusion—Building or structure
Jun 22, 2009500 galGrease / FOG—Building or structure;Other paved surface
May 4, 200940 galEquipment Failure—Storm drain;Street/curb and gutter
Mar 12, 2009600 galOther / Unknown—Other (specify below)
Mar 8, 2009200 galRoot Intrusion—Unpaved surface
Mar 1, 20092K galOther / UnknownYesStorm drain;Street/curb and gutter;Surface water
Jun 26, 200815 galRoot Intrusion—Unpaved surface
Jun 9, 200830 galRoot Intrusion—Unpaved surface
Apr 3, 2008500 galRoot IntrusionYesStorm drain;Street/curb and gutter;Surface water
Jan 22, 200890 galOther / UnknownYesOther paved surface;Separate storm drain;Street/curb and gutter;Unpaved surface
Jan 19, 200814K galEquipment FailureYesOther paved surface;Separate storm drain;Street/curb and gutter;Unpaved surface
Dec 10, 200717K galEquipment FailureYesBuilding or structure;Storm drain;Street/curb and gutter;Surface water;Unpaved surface
Oct 30, 200760 galEquipment Failure—Street/curb and gutter
Oct 29, 20072K galEquipment FailureYesStorm drain;Street/curb and gutter
Sep 24, 2007150 galEquipment Failure—Unpaved surface
Jul 29, 2007550 galRoot IntrusionYesStorm drain
Apr 17, 200750 galEquipment Failure—Unpaved surface
Jan 15, 2007140 galEquipment Failure—Other (specify below)

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