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California · California (CIWQS)

San Carlos City

B
Seldom reaches water
Reported events
435
Total volume
197K gal
Reached waterways
47 (11%)
Reporting since
2007

What caused the overflows

Root Intrusion
170
Equipment Failure
94
Other / Unknown
76
Grease / FOG
74
Rainfall / Flooding
18
Capacity Issue
3

Reported overflow events (showing 200 of 435)

DateVolumeCauseReached waterReceiving water
Mar 15, 2026375 galGrease / FOGYesBrittan Creek
Jan 24, 20263K galRoot Intrusion——
Jan 15, 2026675 galGrease / FOG——
Dec 9, 20252K galGrease / FOGYesPulgas Creek
Dec 5, 202559 galRoot Intrusion——
Aug 11, 20251K galGrease / FOG——
Jun 23, 202595 galEquipment Failure——
May 17, 20251K galGrease / FOG——
Apr 22, 2025162 galGrease / FOG——
Apr 20, 2025260 galGrease / FOGYesBrittan Creek
Mar 20, 2025245 galGrease / FOG——
Jan 5, 202514K galRoot IntrusionYesPulgas Creek
Oct 14, 2024222 galGrease / FOG——
Aug 7, 2024165 galGrease / FOG——
Jun 18, 20244K galRoot Intrusion——
Jan 22, 202433K galRainfall / FloodingYesPulgas Creek
Nov 21, 20232K galRoot Intrusion——
Oct 23, 2023180 galEquipment Failure——
Sep 22, 202374 galRoot Intrusion——
Sep 2, 20233K galOther / UnknownYesPulgas Creek
May 29, 2023385 galGrease / FOG——
Mar 22, 2023360 galRoot Intrusion—Unpaved surface
Mar 6, 202311 galRoot Intrusion—Street/Curb and Gutter
Mar 2, 202324 galRoot Intrusion—Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Feb 11, 202310 galRoot Intrusion—Other (specify below);Paved Surface;Unpaved surface
Nov 28, 2022333 galRoot Intrusion—Separate Storm Drain;Street/Curb and Gutter
Nov 25, 202210 galEquipment Failure—Paved Surface;Street/Curb and Gutter
Nov 11, 202210 galEquipment Failure—Paved Surface;Street/Curb and Gutter
Sep 4, 202245 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter
Aug 28, 20222K galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Jul 27, 20227 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Jul 26, 2022180 galGrease / FOG—Combined Storm Drain (Combined CS only);Paved Surface;Street/Curb and Gutter
Jun 27, 20229 galRoot Intrusion—Separate Storm Drain;Street/Curb and Gutter
Jun 2, 202260 galRoot Intrusion—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
May 21, 20228 galRoot Intrusion—Street/Curb and Gutter
May 1, 20224 galRoot Intrusion—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Apr 20, 2022640 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Apr 4, 20227 galRoot Intrusion—Street/Curb and Gutter
Jan 19, 2022750 galRoot Intrusion—Separate Storm Drain;Street/Curb and Gutter
Jan 11, 2022804 galRoot Intrusion—Unpaved surface
Jan 6, 2022390 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Dec 23, 20213K galGrease / FOGYesBuilding or Structure;Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Surface Water
Dec 23, 20211K galRoot Intrusion—Building or Structure;Paved Surface;Street/Curb and Gutter
Dec 14, 20213K galEquipment FailureYesSeparate Storm Drain;Street/Curb and Gutter;Unpaved surface
Nov 29, 202124 galRoot Intrusion—Unpaved surface
Nov 11, 202176 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter
Oct 27, 2021421 galOther / Unknown—Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Oct 20, 2021575 galRoot Intrusion—Separate Storm Drain;Street/Curb and Gutter
Oct 4, 20214 galRoot Intrusion—Paved Surface
Oct 4, 202112 galGrease / FOG—Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Aug 5, 20212 galGrease / FOG—Street/Curb and Gutter
Jun 16, 202110 galRoot Intrusion—Unpaved surface
Jun 10, 20212K galOther / UnknownYesPaved Surface;Separate Storm Drain;Street/Curb and Gutter
Jun 9, 2021340 galEquipment Failure—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
May 20, 202137 galRoot Intrusion—Paved Surface;Unpaved surface
May 19, 202117 galEquipment Failure—Unpaved surface
May 11, 202137 galGrease / FOG—Unpaved surface
Jan 30, 202118 galRoot Intrusion—Unpaved surface
Dec 17, 202074 galRoot Intrusion—Other (specify below);Separate Storm Drain;Street/Curb and Gutter
Dec 16, 202037 galRoot Intrusion—Unpaved surface
Dec 5, 202014 galRoot Intrusion—Other (specify below);Separate Storm Drain;Street/Curb and Gutter
Dec 2, 202081 galRoot Intrusion—Other (specify below);Street/Curb and Gutter
Nov 21, 2020672 galRoot IntrusionYesStreet/Curb and Gutter;Surface Water
Nov 19, 2020240 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter
Nov 12, 202051 galRoot Intrusion—Street/Curb and Gutter;Unpaved surface
Nov 1, 2020185 galEquipment Failure—Separate Storm Drain;Street/Curb and Gutter
Oct 21, 2020430 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Sep 14, 202040 galRoot Intrusion—Unpaved surface
Jul 15, 202010 galOther / Unknown—Unpaved surface
Jul 10, 2020131 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Jun 26, 2020105 galRoot Intrusion—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Jun 8, 2020910 galGrease / FOG—Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Jun 6, 2020728 galEquipment Failure—Street/Curb and Gutter;Unpaved surface
Feb 9, 2020275 galGrease / FOG—Drainage Channel;Street/Curb and Gutter
Nov 2, 2019700 galEquipment FailureYesDrainage Channel;Street/Curb and Gutter
May 10, 2019130 galOther / Unknown—Other (specify below)
Apr 29, 20195K galRoot IntrusionYesSeparate Storm Drain
Apr 29, 2019400 galEquipment Failure—Street/Curb and Gutter;Unpaved surface
Mar 29, 201990 galGrease / FOGYesOther (specify below)
Jan 18, 201945 galRoot Intrusion—Unpaved surface
Nov 16, 2018400 galEquipment FailureYesSeparate Storm Drain
Jul 11, 201840 galOther / Unknown—Paved Surface
Oct 11, 2017120 galGrease / FOG—Unpaved surface
Jun 25, 2017250 galEquipment Failure—Street/Curb and Gutter
May 16, 2017110 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
Apr 19, 201720 galEquipment Failure—Street/Curb and Gutter
Apr 12, 2017500 galOther / UnknownYesSeparate Storm Drain
Jan 27, 201760 galEquipment Failure—Unpaved surface
Jan 18, 201740 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
Jan 8, 201720 galRoot Intrusion—Unpaved surface
Jul 24, 201645 galEquipment Failure—Separate Storm Drain;Street/Curb and Gutter
Jul 8, 201690 galEquipment FailureYesSeparate Storm Drain;Street/Curb and Gutter
Jun 22, 2016120 galEquipment Failure—Paved Surface;Street/Curb and Gutter
May 10, 2016150 galGrease / FOG—Street/Curb and Gutter;Unpaved surface
Mar 17, 2016200 galEquipment FailureYesDrainage Channel;Street/Curb and Gutter
Mar 8, 2016100 galOther / UnknownYesSeparate Storm Drain
Jan 29, 201660 galGrease / FOG—Unpaved surface
Jan 21, 201630 galEquipment Failure—Paved Surface;Street/Curb and Gutter
Dec 24, 2015280 galEquipment Failure—Unpaved surface
Dec 18, 2015150 galEquipment Failure—Unpaved surface
Nov 30, 2015150 galEquipment Failure—Street/Curb and Gutter
Oct 22, 2015200 galEquipment Failure—Building or Structure;Unpaved surface
Jul 16, 2015200 galGrease / FOG—Separate Storm Drain
Apr 28, 2015120 galRoot Intrusion—Unpaved surface
Apr 13, 201530 galEquipment Failure—Street/Curb and Gutter
Mar 30, 2015125 galEquipment Failure—Paved Surface;Street/Curb and Gutter
Mar 21, 201550 galEquipment Failure—Paved Surface;Street/Curb and Gutter
Mar 5, 201520 galEquipment Failure—Street/Curb and Gutter
Feb 28, 20155 galRoot Intrusion—Street/Curb and Gutter
Feb 27, 20153K galRoot IntrusionYesBuilding or Structure;Separate Storm Drain;Street/Curb and Gutter
Feb 10, 201530 galGrease / FOG—Paved Surface;Street/Curb and Gutter
Nov 17, 2014120 galRoot Intrusion—Unpaved surface
Nov 12, 201430 galRoot Intrusion—Street/Curb and Gutter
Nov 10, 201420 galEquipment Failure—Street/Curb and Gutter
Oct 31, 201455 galEquipment Failure—Paved Surface;Unpaved surface
Oct 27, 201420 galRoot Intrusion—Street/Curb and Gutter
Oct 24, 2014250 galEquipment Failure—Unpaved surface
Oct 20, 201439 galRoot Intrusion—Street/Curb and Gutter
Oct 18, 201430 galRoot Intrusion—Street/Curb and Gutter
Oct 17, 201448 galRoot Intrusion—Street/Curb and Gutter
Sep 3, 201420 galGrease / FOG—Street/Curb and Gutter
Aug 4, 201415 galRoot Intrusion—Street/Curb and Gutter
Jul 20, 20145 galGrease / FOG—Street/Curb and Gutter
Jul 16, 201450 galEquipment Failure—Separate Storm Drain;Street/Curb and Gutter
Jul 4, 201420 galEquipment Failure—Street/Curb and Gutter
Jun 23, 201440 galEquipment Failure—Street/Curb and Gutter
Jun 11, 20143 galRoot Intrusion—Street/Curb and Gutter
Jun 5, 201420 galRoot Intrusion—Street/Curb and Gutter
Jun 3, 201430 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
May 27, 2014150 galGrease / FOG—Unpaved surface
May 3, 20148 galEquipment Failure—Paved Surface
Mar 21, 201430 galOther / Unknown—Paved Surface
Mar 20, 2014100 galOther / Unknown—Paved Surface
Mar 10, 2014140 galOther / Unknown—Separate Storm Drain
Mar 7, 20145 galEquipment Failure—Street/Curb and Gutter
Mar 7, 20145 galRoot Intrusion—Unpaved surface
Mar 4, 201450 galEquipment Failure—Paved Surface;Street/Curb and Gutter
Feb 11, 2014123 galRoot Intrusion—Unpaved surface
Feb 5, 201420 galEquipment Failure—Street/Curb and Gutter
Dec 17, 201330 galEquipment Failure—Paved Surface;Street/Curb and Gutter
Nov 17, 201330 galRoot Intrusion—Unpaved surface
Nov 13, 201320 galEquipment Failure—Unpaved surface
Nov 6, 201350 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
Oct 23, 201375 galEquipment Failure—Street/Curb and Gutter
Oct 20, 2013135 galEquipment Failure—Street/Curb and Gutter
Sep 24, 201320 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
Sep 9, 201310 galOther / Unknown—Street/Curb and Gutter
Sep 5, 201312 galOther / Unknown—Street/curb and gutter
Jul 4, 201350 galRoot Intrusion—Street/curb and gutter
Jun 21, 201320 galGrease / FOG—Street/curb and gutter
Jun 20, 201310 galEquipment Failure—Street/curb and gutter
May 1, 201328 galGrease / FOG—Other paved surface;Street/curb and gutter
Mar 5, 201360 galGrease / FOG—Street/curb and gutter
Jan 23, 201330 galOther / Unknown—Street/curb and gutter
Dec 2, 2012100 galRainfall / Flooding—Building or structure
Nov 22, 201235 galRoot Intrusion—Building or structure
Nov 13, 2012300 galRoot Intrusion—Street/curb and gutter;Unpaved surface
Nov 8, 201225 galOther / Unknown—Building or structure
Oct 2, 201230 galRoot Intrusion—Street/curb and gutter
Oct 1, 201260 galRoot Intrusion—Unpaved surface
Jul 20, 201210 galGrease / FOG—Street/curb and gutter
Jul 10, 201230 galOther / Unknown—Street/curb and gutter
Jun 27, 20125 galRoot Intrusion—Street/curb and gutter
Jun 20, 201230 galOther / Unknown—Street/curb and gutter
Jun 15, 201215 galOther / Unknown—Street/curb and gutter
Jun 14, 201222 galOther / Unknown—Street/curb and gutter
Jun 9, 20121 galRoot Intrusion—Unpaved surface
May 11, 20125 galOther / Unknown—Street/curb and gutter
May 6, 20121 galOther / Unknown—Other paved surface
Apr 30, 20126 galOther / Unknown—Separate storm drain;Street/curb and gutter
Mar 23, 20122 galOther / Unknown—Building or structure
Mar 12, 20123 galOther / Unknown—Building or structure
Mar 6, 201260 galOther / Unknown—Street/curb and gutter
Feb 24, 201210 galOther / Unknown—Unpaved surface
Feb 13, 20125 galRoot Intrusion—Building or structure
Feb 4, 201230 galGrease / FOG—Street/curb and gutter
Jan 31, 201250 galRoot Intrusion—Street/curb and gutter
Nov 1, 201120 galOther / Unknown—Street/curb and gutter
Oct 28, 201120 galOther / Unknown—Street/curb and gutter
Oct 22, 201145 galRoot Intrusion—Street/curb and gutter
Sep 7, 201140 galGrease / FOG—Unpaved surface
Aug 13, 201130 galOther / Unknown—Street/curb and gutter
Aug 12, 201120 galRoot Intrusion—Street/curb and gutter
Jul 19, 201145 galGrease / FOG—Street/curb and gutter
Jul 18, 201140 galRoot Intrusion—Street/curb and gutter
Jun 25, 201130 galRoot Intrusion—Street/curb and gutter
Jun 3, 201160 galRoot Intrusion—Street/curb and gutter
May 26, 201130 galRoot Intrusion—Street/curb and gutter
May 22, 201180 galRoot Intrusion—Street/curb and gutter
Apr 11, 20115 galOther / Unknown—Street/curb and gutter
Apr 8, 201130 galOther / Unknown—Street/curb and gutter
Mar 24, 20111K galOther / UnknownYesSurface water
Mar 24, 2011170 galOther / UnknownYesSurface water
Mar 12, 20114K galRoot IntrusionYesSurface water
Mar 11, 201130 galRoot Intrusion—Street/curb and gutter
Mar 8, 2011150 galRoot Intrusion—Street/curb and gutter
Mar 3, 20112 galRoot Intrusion—Unpaved surface
Feb 25, 201120 galRoot Intrusion—Other paved surface
Feb 22, 201115 galRoot Intrusion—Street/curb and gutter
Feb 18, 201115 galGrease / FOG—Street/curb and gutter

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