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California · California (CIWQS)

Ross Valley SD

D
Frequently reaches water
Reported events
491
Total volume
4.5M gal
Reached waterways
148 (30%)
Reporting since
1993

What caused the overflows

Equipment Failure
198
Root Intrusion
124
Other / Unknown
124
Grease / FOG
21
Capacity Issue
13
Rainfall / Flooding
11

Reported overflow events (showing 200 of 491)

DateVolumeCauseReached waterReceiving water
Jan 3, 202643K galOther / UnknownYesCorte Madera Creek
Jan 3, 202643K galOther / UnknownYesCorte Madera Creek
Jan 2, 20267K galOther / UnknownYesCorte Madera Creek
Jan 2, 20267K galOther / UnknownYesCorte Madera Creek
Jan 1, 20262K galOther / UnknownYesCorte Madera Creek
Jan 1, 20262K galOther / UnknownYesCorte Madera Creek
Oct 17, 202510 galEquipment FailureYesSleepy Hollow Creek
Oct 13, 20258K galGrease / FOGYesCorte Madera Creek
Aug 3, 2025197 galEquipment FailureYesCorte Madera Creek
Feb 6, 2025113K galEquipment FailureYesCorta Madera Creek
Feb 6, 2025115K galEquipment FailureYesCorta Madera Creek
Dec 17, 20241K galGrease / FOGYesCorta Madera Creek
Dec 14, 2024589 galRainfall / Flooding——
Oct 18, 2024159 galGrease / FOG——
Aug 14, 2024117 galRoot Intrusion——
Jun 14, 202444 galEquipment FailureYesCorte Madera Creek
May 1, 2024178 galRoot Intrusion——
Feb 16, 2024420 galGrease / FOG——
Jan 31, 2024900 galEquipment Failure——
Jan 10, 20242K galEquipment FailureYesLarkspur creek
Nov 26, 2023442 galRoot IntrusionYesCorte Madera Creek
Sep 12, 20231K galEquipment FailureYesun-named
May 25, 2023885 galGrease / FOG—Unpaved surface
Apr 30, 2023280 galEquipment FailureYesSeparate Storm Drain
Feb 5, 2023564 galRoot IntrusionYesUnpaved surface
Jan 19, 2023627 galEquipment FailureYesPaved Surface;Separate Storm Drain;Street/Curb and Gutter;Surface Water;Unpaved surface
Jan 11, 20231K galEquipment FailureYesSurface Water
Jan 11, 2023547 galEquipment FailureYesPaved Surface;Separate Storm Drain;Surface Water;Unpaved surface
Oct 27, 202217 galRoot Intrusion—Unpaved surface
Aug 1, 202218 galEquipment Failure—Unpaved surface
Jun 2, 2022434 galEquipment FailureYesSurface Water
Apr 21, 20221 galEquipment Failure—Paved Surface
Mar 10, 202264 galOther / Unknown—Unpaved surface
Mar 3, 2022292 galEquipment Failure—Paved Surface
Jan 11, 202264 galEquipment FailureYesDrainage Channel
Dec 20, 2021143 galEquipment FailureYesDrainage Channel;Unpaved surface
Dec 4, 20216 galEquipment Failure—Paved Surface;Unpaved surface
Nov 4, 20213 galRoot Intrusion—Paved Surface
Oct 27, 202130 galGrease / FOG—Unpaved surface
Oct 24, 202151K galEquipment FailureYesDrainage Channel;Paved Surface;Surface Water;Unpaved surface
Oct 24, 20212K galRoot IntrusionYesSeparate Storm Drain
Oct 24, 202191K galOther / UnknownYesSurface Water
Oct 24, 20219K galEquipment FailureYesSeparate Storm Drain
Oct 22, 2021170 galEquipment Failure—Paved Surface
Oct 8, 2021230 galRoot Intrusion—Unpaved surface
Aug 27, 20211 galEquipment Failure—Paved Surface
Aug 16, 2021309 galEquipment Failure—Unpaved surface
Aug 16, 202188 galEquipment Failure—Unpaved surface
Aug 11, 2021170 galRoot Intrusion—Street/Curb and Gutter
May 27, 202152 galRoot Intrusion—Unpaved surface
Apr 8, 20212K galEquipment FailureYesSurface Water;Unpaved surface
Mar 2, 202131 galEquipment FailureYesSurface Water
Feb 17, 2021102 galEquipment Failure—Drainage Channel
Feb 14, 20216 galEquipment Failure—Paved Surface
Feb 9, 202122 galEquipment Failure—Unpaved surface
Jan 27, 2021924 galEquipment Failure—Unpaved surface
Dec 30, 202043 galEquipment Failure—Unpaved surface
Dec 28, 202015 galEquipment Failure—Unpaved surface
Dec 20, 202077 galEquipment Failure—Unpaved surface
Dec 11, 202020 galEquipment Failure—Separate Storm Drain
Nov 28, 2020251 galEquipment FailureYesSurface Water
Oct 13, 2020335 galEquipment Failure—Unpaved surface
Jul 24, 20206 galEquipment Failure—Paved Surface
Jun 7, 20202K galGrease / FOGYesSurface Water
May 7, 202030 galRoot Intrusion—Unpaved surface
May 6, 20205 galEquipment Failure—Street/Curb and Gutter
Feb 29, 202041 galEquipment Failure—Unpaved surface
Feb 1, 20203K galRoot Intrusion—Unpaved surface
Jan 23, 20201K galEquipment Failure—Unpaved surface
Jan 10, 202040 galEquipment Failure—Unpaved surface
Oct 16, 201955 galEquipment Failure—Unpaved surface
Oct 1, 201914 galEquipment Failure—Unpaved surface
Sep 29, 201930 galRoot Intrusion—Unpaved surface
Sep 8, 201910 galEquipment Failure—Unpaved surface
Aug 14, 2019232 galEquipment Failure—Unpaved surface
Aug 2, 20193 galEquipment Failure—Unpaved surface
Jul 28, 201930 galRoot Intrusion—Unpaved surface
Jul 20, 20195 galEquipment Failure—Paved Surface
Jun 13, 201915 galEquipment Failure—Unpaved surface
May 23, 2019144 galEquipment Failure—Unpaved surface
May 18, 2019459 galEquipment Failure—Unpaved surface
May 17, 201922 galRoot Intrusion—Unpaved surface
May 12, 201970 galOther / Unknown—Unpaved surface
Apr 26, 201920 galEquipment Failure—Unpaved surface
Apr 18, 20195 galEquipment Failure—Unpaved surface
Apr 14, 20197 galEquipment Failure—Unpaved surface
Mar 29, 2019236 galEquipment Failure—Unpaved surface
Mar 18, 2019650 galOther / Unknown—Unpaved surface
Feb 11, 20192K galEquipment FailureYesSurface Water
Feb 8, 2019165 galEquipment Failure—Unpaved surface
Feb 3, 2019750 galEquipment FailureYesSeparate Storm Drain
Jan 28, 2019705 galEquipment FailureYesSurface Water
Jan 6, 201910 galCapacity IssueYesSurface Water
Jan 6, 2019226K galOther / UnknownYesSurface Water
Dec 27, 2018815 galEquipment Failure—Unpaved surface
Oct 10, 20181K galEquipment Failure—Unpaved surface
Aug 31, 201830 galEquipment Failure—Unpaved surface
Jun 12, 2018276 galRoot Intrusion—Unpaved surface
Apr 22, 201825 galRoot Intrusion—Unpaved surface
Apr 21, 201871 galEquipment FailureYesSurface Water
Apr 17, 20187 galEquipment Failure—Paved Surface
Mar 18, 20185 galEquipment Failure—Paved Surface
Mar 16, 201878 galEquipment Failure—Paved Surface;Unpaved surface
Mar 9, 2018520 galOther / UnknownYesSeparate Storm Drain
Feb 8, 20185 galOther / Unknown—Unpaved surface
Jan 25, 201873 galEquipment FailureYesSeparate Storm Drain
Jan 19, 201892 galEquipment Failure—Street/Curb and Gutter
Jan 13, 201814 galEquipment Failure—Paved Surface
Dec 29, 201728 galEquipment Failure—Paved Surface
Dec 27, 20172 galOther / Unknown—Paved Surface
Nov 16, 20173 galEquipment Failure—Unpaved surface
Nov 16, 2017250 galEquipment FailureYesSurface Water
Nov 2, 201715K galEquipment FailureYesSurface Water
Nov 2, 201778 galOther / UnknownYesSurface Water
Oct 28, 201740 galEquipment Failure—Street/Curb and Gutter
Sep 28, 201715 galRoot Intrusion—Unpaved surface
Sep 26, 201740 galOther / UnknownYesSurface Water
Aug 20, 201715 galEquipment Failure—Street/Curb and Gutter
Aug 17, 20176 galRoot Intrusion—Street/Curb and Gutter
Jul 18, 201740 galEquipment Failure—Unpaved surface
Jul 18, 20174 galEquipment Failure—Separate Storm Drain
Jul 2, 20171K galRoot Intrusion—Unpaved surface
May 23, 201750 galEquipment Failure—Unpaved surface
May 2, 201720 galRoot Intrusion—Paved Surface
Apr 26, 20172K galEquipment Failure—Unpaved surface
Mar 28, 2017980 galEquipment FailureYesSurface Water
Mar 23, 201782 galOther / Unknown—Other (specify below)
Mar 22, 201742 galRoot IntrusionYesSurface Water
Mar 21, 2017739 galRoot IntrusionYesSurface Water
Mar 4, 2017279 galEquipment Failure—Street/Curb and Gutter
Mar 1, 2017638 galEquipment FailureYesSurface Water
Feb 27, 20172K galEquipment FailureYesSurface Water
Feb 9, 201784 galRainfall / FloodingYesSeparate Storm Drain
Feb 7, 2017590 galRainfall / FloodingYesSurface Water
Feb 7, 201730K galRainfall / FloodingYesSurface Water
Feb 7, 201725 galRainfall / FloodingYesSurface Water
Jan 22, 201715K galRainfall / FloodingYesSurface Water
Jan 13, 20172K galRoot IntrusionYesSurface Water
Jan 10, 201745K galRainfall / FloodingYesSurface Water
Jan 8, 20177K galOther / UnknownYesSurface Water
Jan 7, 201755 galEquipment FailureYesSeparate Storm Drain
Jan 4, 2017480 galEquipment Failure—Unpaved surface
Dec 26, 20163 galEquipment Failure—Paved Surface
Dec 20, 20161 galEquipment Failure—Street/Curb and Gutter
Dec 19, 201650 galEquipment Failure—Street/Curb and Gutter
Dec 15, 201672 galEquipment Failure—Unpaved surface
Dec 15, 201613K galOther / UnknownYesSurface Water
Dec 10, 201645 galEquipment FailureYesSurface Water
Dec 10, 201620 galEquipment Failure—Paved Surface
Dec 5, 201610 galRoot Intrusion—Unpaved surface
Nov 23, 20169K galEquipment Failure—Unpaved surface
Nov 10, 2016100 galOther / Unknown—Street/Curb and Gutter
Oct 27, 201660 galEquipment Failure—Unpaved surface
Oct 27, 201615 galEquipment Failure—Unpaved surface
Oct 18, 201622 galRoot Intrusion—Unpaved surface
Sep 30, 2016500 galEquipment Failure—Paved Surface
Sep 7, 2016200 galEquipment Failure—Paved Surface
Aug 28, 201635 galOther / Unknown—Unpaved surface
Aug 23, 20162K galOther / UnknownYesSeparate Storm Drain
Jul 30, 20163K galEquipment FailureYesSurface Water
Jun 9, 2016570 galEquipment FailureYesSurface Water
Jun 8, 2016514 galEquipment Failure—Unpaved surface
May 25, 201650 galRoot Intrusion—Unpaved surface
Apr 24, 2016150 galEquipment Failure—Unpaved surface
Apr 13, 2016500 galEquipment FailureYesSurface Water
Apr 4, 2016500 galEquipment Failure—Street/Curb and Gutter
Mar 28, 2016500 galEquipment FailureYesSurface Water
Feb 25, 2016200 galEquipment FailureYesUnpaved surface
Feb 21, 2016180 galRoot Intrusion—Unpaved surface
Feb 18, 20162 galEquipment Failure—Separate Storm Drain
Feb 18, 2016540 galEquipment Failure—Unpaved surface
Feb 17, 201650 galEquipment Failure—Unpaved surface
Feb 7, 2016100 galRoot Intrusion—Unpaved surface
Feb 5, 2016365 galGrease / FOGYesSeparate Storm Drain
Feb 5, 201650 galRoot Intrusion—Unpaved surface
Feb 2, 2016800 galGrease / FOGYesSurface Water
Jan 18, 2016599 galRoot Intrusion—Unpaved surface
Jan 10, 201650 galRoot Intrusion—Unpaved surface
Dec 28, 20151 galEquipment Failure—Paved Surface
Dec 25, 2015630 galRoot Intrusion—Unpaved surface
Dec 22, 20151 galRoot Intrusion—Paved Surface
Dec 17, 2015100 galEquipment Failure—Unpaved surface
Dec 17, 201525 galEquipment Failure—Unpaved surface
Nov 26, 201572 galRoot Intrusion—Paved Surface
Nov 25, 20155 galEquipment Failure—Unpaved surface
Nov 25, 201546 galRoot Intrusion—Paved Surface
Nov 15, 201550 galRoot Intrusion—Paved Surface
Oct 27, 2015176 galEquipment Failure—Separate Storm Drain
Oct 21, 201510 galOther / Unknown—Paved Surface
Sep 25, 20155 galRoot Intrusion—Paved Surface
Sep 10, 2015235 galEquipment Failure—Other (specify below)
Aug 5, 2015150 galGrease / FOGYesDrainage Channel
Jul 28, 2015300 galEquipment Failure—Unpaved surface
Jun 20, 2015211 galGrease / FOGYesSeparate Storm Drain
Jun 1, 20154K galRoot Intrusion—Unpaved surface
May 7, 201525 galEquipment Failure—Paved Surface
Apr 18, 2015467 galOther / Unknown—Street/Curb and Gutter
Apr 1, 201550 galOther / Unknown—Unpaved surface
Mar 3, 2015760 galRoot Intrusion—Unpaved surface
Feb 10, 20152K galEquipment Failure—Unpaved surface

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