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California · California (CIWQS)

Delta Diablo

D
Frequently reaches water
Reported events
52
Total volume
61.0M gal
Reached waterways
17 (33%)
Reporting since
2008

What caused the overflows

Equipment Failure
20
Other / Unknown
19
Grease / FOG
7
Root Intrusion
6

Reported overflow events (showing 52 of 52)

DateVolumeCauseReached waterReceiving water
Apr 27, 2026544 galGrease / FOG——
Jan 5, 2026194 galOther / Unknown——
Dec 3, 202552 galOther / Unknown——
Jul 31, 2025120 galEquipment Failure——
Mar 25, 2025840 galGrease / FOG——
Nov 5, 202420.0M galEquipment FailureYesUnnamed natural drainage channel in a marshland area leading to Suisun Bay on private property
Nov 5, 202420.0M galEquipment FailureYesUnnamed natural drainage channel in a marshland area leading to Suisun Bay on private property
Nov 5, 202420.0M galEquipment FailureYesUnnamed natural drainage channel in a marshland area leading to Suisun Bay on private property
May 15, 20249K galOther / Unknown—We recovered the spill and returned it to our system.
May 15, 20249K galOther / Unknown—We recovered the spill and returned it to our system.
May 31, 20236K galRoot IntrusionYesDrainage Channel
Dec 31, 20226K galOther / UnknownYesUnpaved surface
Dec 31, 2022678K galOther / UnknownYesDrainage Channel
Dec 31, 20221K galOther / UnknownYesDrainage Channel
Dec 31, 202250K galOther / UnknownYesDrainage Channel
Dec 14, 202115 galOther / Unknown—Unpaved surface
Aug 2, 2020127 galEquipment Failure—Unpaved surface
Dec 3, 201937K galEquipment FailureYesSeparate Storm Drain;Street/Curb and Gutter;Surface Water
Nov 26, 201960 galOther / Unknown—Paved Surface;Street/Curb and Gutter
Jun 13, 2018213 galOther / Unknown—Street/Curb and Gutter
Mar 19, 2018861 galEquipment FailureYesDrainage Channel;Unpaved surface
Sep 10, 201710K galEquipment Failure—Paved Surface;Street/Curb and Gutter;Unpaved surface
Feb 4, 20174K galRoot Intrusion—Unpaved surface
May 12, 2015678 galEquipment Failure—Unpaved surface
Jul 21, 2014300 galEquipment Failure—Unpaved surface
Dec 20, 201329 galRoot Intrusion—Unpaved surface
Dec 16, 201324 galRoot Intrusion—Paved Surface
Aug 21, 20131K galOther / UnknownYesSeparate storm drain;Street/curb and gutter;Unpaved surface
Aug 20, 2013150 galEquipment Failure—Other paved surface;Street/curb and gutter
Aug 10, 201345K galEquipment FailureYesOther (specify below)
Jan 24, 2013136K galRoot IntrusionYesSeparate storm drain;Unpaved surface
Sep 1, 2012157 galOther / Unknown—Street/curb and gutter
Aug 10, 2012200 galOther / UnknownYesUnpaved surface
Jun 14, 201250 galEquipment Failure—Other (specify below)
May 9, 2012875 galGrease / FOG—Separate storm drain
Dec 24, 20116K galOther / UnknownYesSeparate storm drain;Street/curb and gutter;Unpaved surface
Sep 21, 201180 galOther / Unknown—Unpaved surface
Dec 5, 2010300 galEquipment Failure—Other (specify below)
Nov 11, 2010500 galOther / UnknownYesOther (specify below)
Aug 30, 2010240 galGrease / FOG—Other paved surface
Aug 30, 2010240 galEquipment Failure—Storm drain;Street/curb and gutter
Aug 4, 201010K galEquipment Failure—Storm drain
Jul 21, 201025 galEquipment Failure—Other paved surface
Apr 7, 2010440 galGrease / FOG—Building or structure;Storm drain;Street/curb and gutter
Feb 15, 20102K galEquipment FailureYesStorm drain;Surface water
Feb 3, 201025 galOther / Unknown—Other paved surface
Jan 12, 20102K galRoot Intrusion—Storm drain
Dec 28, 200960 galGrease / FOG—Other (specify below)
Jul 2, 2009800 galEquipment Failure—Unpaved surface
Jun 22, 2009150 galGrease / FOG—Other paved surface
Sep 2, 20085 galOther / Unknown—Unpaved surface
Aug 17, 200835 galEquipment Failure—Other paved surface;Street/curb and gutter

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