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California · California (CIWQS)

Humboldt CSD

D
Frequently reaches water
Reported events
50
Total volume
294K gal
Reached waterways
24 (48%)
Reporting since
2007

What caused the overflows

Other / Unknown
19
Equipment Failure
18
Grease / FOG
8
Root Intrusion
3
Rainfall / Flooding
1
Capacity Issue
1

Reported overflow events (showing 50 of 50)

DateVolumeCauseReached waterReceiving water
Feb 25, 2026100 galOther / Unknown—None
Feb 24, 202630K galOther / UnknownYesHumboldt Bay
Jan 7, 20262K galEquipment FailureYesHumboldt Bay
Jan 1, 20262K galOther / UnknownYes—
Jan 1, 202636K galOther / UnknownYesHumboldt Bay/ Pacific ocean
Dec 21, 202531K galOther / UnknownYesEureka Slough
Dec 18, 2025175 galOther / Unknown——
Nov 10, 2025315 galGrease / FOG——
Sep 22, 2025100 galOther / Unknown——
Jun 23, 2025200 galOther / Unknown——
Jun 3, 2025750 galOther / Unknown——
Dec 29, 202422K galCapacity IssueYesEureka Slough
Dec 29, 202422K galOther / UnknownYes—
Oct 14, 202360 galGrease / FOG——
Sep 4, 2023225 galEquipment FailureYesMartin Slough, Swain Slough, Elk River Slough, Humboldt Bay
Jul 12, 2023450 galEquipment Failure——
Jul 1, 20231K galOther / UnknownYesElk River Slough, Humboldt Bay, Pacific Ocean
Mar 14, 2023200 galRainfall / FloodingYesSurface Water
May 16, 202215K galEquipment Failure—Unpaved surface
Nov 14, 2021700 galGrease / FOG—Other (specify below)
Oct 4, 20202K galRoot Intrusion—Other (specify below)
Apr 1, 202080 galEquipment Failure—Other (specify below)
Apr 1, 201950 galEquipment Failure—Unpaved surface
Feb 27, 20195K galOther / UnknownYesDrainage Channel;Other (specify below);Surface Water;Unpaved surface
Feb 25, 201910K galEquipment FailureYesDrainage Channel;Other (specify below);Surface Water;Unpaved surface
Dec 16, 20186K galEquipment Failure—Other (specify below)
Oct 11, 20172K galGrease / FOGYesDrainage Channel;Surface Water
Feb 21, 2017750 galEquipment FailureYesSurface Water
Feb 7, 201790 galGrease / FOGYesSurface Water
Dec 14, 2016300 galOther / UnknownYesSurface Water
Mar 11, 20169K galEquipment Failure—Other (specify below)
Jan 21, 20161K galRoot Intrusion—Unpaved surface
Dec 30, 2015500 galRoot IntrusionYesOther (specify below)
Jun 11, 201483K galEquipment FailureYesDrainage Channel;Surface Water;Unpaved surface
Feb 8, 201470 galOther / UnknownYesSeparate Storm Drain;Surface Water;Unpaved surface
Oct 23, 2013300 galGrease / FOG—Unpaved surface
Mar 10, 201345 galOther / Unknown—Other (specify below)
Apr 15, 20123K galGrease / FOG—Other (specify below)
Jan 21, 20122K galOther / UnknownYesSurface water
Jun 19, 2011300 galEquipment Failure—Other (specify below)
Jan 9, 201050 galOther / UnknownYesStorm drain
Nov 30, 2009425 galEquipment Failure—Other (specify below)
Sep 28, 200950 galGrease / FOGYesOther (specify below)
Jul 2, 200950 galOther / Unknown—Street/curb and gutter
Aug 30, 200850 galOther / UnknownYesOther (specify below)
Mar 14, 20082K galEquipment FailureYesStorm drain
Dec 4, 2007750 galEquipment Failure—Street/curb and gutter
Sep 7, 2007100 galEquipment Failure—Other paved surface
Jun 26, 2007500 galEquipment Failure—Building or structure;Street/curb and gutter
Jun 18, 2007600 galEquipment Failure—Other (specify below)

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