All rankings
California · California (CIWQS)
Cupertino Sanitary District
B
Seldom reaches water
Reported events
198
Total volume
213K gal
Reached waterways
13 (7%)
Reporting since
2007
What caused the overflows
Root Intrusion
123
Equipment Failure
35
Other / Unknown
21
Grease / FOG
19
Reported overflow events (showing 198 of 198)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Oct 16, 2025 | 124 gal | Root Intrusion | — | — |
| Oct 28, 2024 | 170 gal | Root Intrusion | — | — |
| Feb 20, 2024 | 90 gal | Root Intrusion | — | — |
| Jan 27, 2024 | 419 gal | Root Intrusion | — | — |
| Jan 30, 2023 | 61 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter;Unpaved surface |
| Dec 20, 2022 | 637 gal | Equipment Failure | — | Paved Surface;Street/Curb and Gutter |
| Nov 27, 2022 | 9 gal | Equipment Failure | — | Street/Curb and Gutter |
| Nov 22, 2022 | 74 gal | Equipment Failure | — | Paved Surface;Unpaved surface |
| Nov 21, 2022 | 15 gal | Grease / FOG | — | Paved Surface;Street/Curb and Gutter;Unpaved surface |
| Aug 30, 2022 | 2 gal | Grease / FOG | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Jul 28, 2022 | 7 gal | Grease / FOG | — | Street/Curb and Gutter |
| Apr 21, 2022 | 1K gal | Other / Unknown | — | Unpaved surface |
| Apr 16, 2022 | 9 gal | Equipment Failure | — | Other (specify below);Unpaved surface |
| Apr 15, 2022 | 11 gal | Root Intrusion | — | Street/Curb and Gutter |
| Feb 25, 2022 | 24 gal | Root Intrusion | — | Street/Curb and Gutter |
| Aug 27, 2021 | 7 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter;Unpaved surface |
| Feb 8, 2021 | 3 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Feb 8, 2021 | 3 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Jan 14, 2021 | 300 gal | Root Intrusion | — | Street/Curb and Gutter |
| Oct 13, 2020 | 325 gal | Equipment Failure | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Nov 24, 2019 | 56 gal | Root Intrusion | — | Street/Curb and Gutter |
| Nov 24, 2019 | 56 gal | Root Intrusion | — | Street/Curb and Gutter |
| Jun 28, 2019 | 680 gal | Root Intrusion | — | Unpaved surface |
| May 6, 2019 | 27 gal | Root Intrusion | — | Paved Surface |
| Feb 23, 2019 | 87 gal | Equipment Failure | — | Street/Curb and Gutter |
| Feb 10, 2019 | 99K gal | Equipment Failure | Yes | Drainage Channel;Paved Surface;Street/Curb and Gutter;Surface Water |
| Nov 30, 2018 | 16K gal | Root Intrusion | Yes | Other (specify below) |
| Nov 19, 2018 | 222 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Oct 26, 2018 | 15 gal | Root Intrusion | — | Street/Curb and Gutter |
| Aug 16, 2018 | 217 gal | Other / Unknown | — | Separate Storm Drain |
| Jun 7, 2018 | 28 gal | Other / Unknown | — | Street/Curb and Gutter |
| Mar 20, 2018 | 3 gal | Root Intrusion | — | Unpaved surface |
| Jan 24, 2018 | 18 gal | Equipment Failure | — | Paved Surface;Street/Curb and Gutter |
| Jan 4, 2018 | 10 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Dec 24, 2017 | 11 gal | Root Intrusion | — | Street/Curb and Gutter |
| Dec 2, 2017 | 5 gal | Root Intrusion | — | Street/Curb and Gutter |
| Nov 26, 2017 | 174 gal | Root Intrusion | — | Paved Surface;Unpaved surface |
| Nov 6, 2017 | 106 gal | Root Intrusion | — | Paved Surface |
| Sep 29, 2017 | 2K gal | Root Intrusion | Yes | Drainage Channel;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface |
| Sep 3, 2017 | 472 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter;Unpaved surface |
| Aug 27, 2017 | 799 gal | Root Intrusion | — | Street/Curb and Gutter |
| Aug 7, 2017 | 78 gal | Root Intrusion | — | Street/Curb and Gutter |
| Jul 5, 2017 | 15 gal | Root Intrusion | — | Street/Curb and Gutter |
| Jun 18, 2017 | 110 gal | Root Intrusion | — | Drainage Channel;Street/Curb and Gutter |
| May 28, 2017 | 754 gal | Root Intrusion | — | Street/Curb and Gutter |
| May 24, 2017 | 291 gal | Root Intrusion | — | Other (specify below) |
| May 3, 2017 | 1 gal | Grease / FOG | — | Paved Surface |
| Apr 3, 2017 | 7 gal | Equipment Failure | — | Street/Curb and Gutter |
| Feb 17, 2017 | 6 gal | Root Intrusion | — | Street/Curb and Gutter |
| Feb 8, 2017 | 679 gal | Root Intrusion | — | Paved Surface;Unpaved surface |
| Dec 28, 2016 | 238 gal | Root Intrusion | — | Drainage Channel |
| Dec 20, 2016 | 28 gal | Root Intrusion | — | Street/Curb and Gutter |
| Nov 30, 2016 | 6 gal | Root Intrusion | — | Street/Curb and Gutter |
| Nov 14, 2016 | 80 gal | Root Intrusion | — | Street/Curb and Gutter |
| Nov 13, 2016 | 129 gal | Other / Unknown | — | Separate Storm Drain |
| Oct 23, 2016 | 238 gal | Equipment Failure | — | Street/Curb and Gutter |
| Oct 18, 2016 | 260 gal | Root Intrusion | — | Street/Curb and Gutter |
| Oct 10, 2016 | 350 gal | Equipment Failure | — | Street/Curb and Gutter |
| Aug 31, 2016 | 176 gal | Root Intrusion | — | Street/Curb and Gutter |
| Aug 27, 2016 | 5 gal | Root Intrusion | — | Street/Curb and Gutter |
| Aug 22, 2016 | 281 gal | Root Intrusion | — | Paved Surface |
| Aug 17, 2016 | 2 gal | Root Intrusion | — | Unpaved surface |
| Aug 9, 2016 | 434 gal | Other / Unknown | — | Drainage Channel |
| Jul 17, 2016 | 152 gal | Root Intrusion | — | Paved Surface |
| Jul 10, 2016 | 120 gal | Root Intrusion | — | Unpaved surface |
| May 30, 2016 | 101 gal | Equipment Failure | — | Paved Surface;Street/Curb and Gutter |
| May 26, 2016 | 10 gal | Root Intrusion | — | Building or Structure;Paved Surface |
| May 20, 2016 | 750 gal | Root Intrusion | — | Unpaved surface |
| Mar 3, 2016 | 234 gal | Root Intrusion | — | Street/Curb and Gutter |
| Jan 29, 2016 | 7 gal | Equipment Failure | — | Unpaved surface |
| Jan 20, 2016 | 44 gal | Root Intrusion | — | Street/Curb and Gutter |
| Jan 20, 2016 | 12 gal | Equipment Failure | — | Separate Storm Drain |
| Jan 18, 2016 | 31 gal | Grease / FOG | — | Paved Surface |
| Jan 1, 2016 | 50 gal | Root Intrusion | — | Unpaved surface |
| Dec 27, 2015 | 15 gal | Root Intrusion | — | Street/Curb and Gutter |
| Dec 23, 2015 | 17 gal | Root Intrusion | — | Street/Curb and Gutter |
| Nov 23, 2015 | 345 gal | Grease / FOG | — | Separate Storm Drain |
| Sep 17, 2015 | 178 gal | Equipment Failure | — | Separate Storm Drain |
| Sep 13, 2015 | 30 gal | Root Intrusion | — | Paved Surface |
| Aug 22, 2015 | 27 gal | Root Intrusion | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Jul 26, 2015 | 162 gal | Equipment Failure | — | Separate Storm Drain |
| Jun 12, 2015 | 29 gal | Root Intrusion | — | Paved Surface;Unpaved surface |
| Apr 22, 2015 | 99 gal | Equipment Failure | — | Building or Structure |
| Apr 22, 2015 | 74 gal | Root Intrusion | — | Street/Curb and Gutter |
| Apr 14, 2015 | 288 gal | Root Intrusion | — | Street/Curb and Gutter |
| Feb 12, 2015 | 30 gal | Root Intrusion | — | Street/Curb and Gutter |
| Dec 28, 2014 | 36 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Dec 25, 2014 | 492 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter;Unpaved surface |
| Dec 10, 2014 | 30 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter |
| Dec 9, 2014 | 360 gal | Equipment Failure | — | Building or Structure;Separate Storm Drain |
| Oct 13, 2014 | 231 gal | Equipment Failure | — | Street/Curb and Gutter |
| Oct 7, 2014 | 60 gal | Root Intrusion | — | Street/Curb and Gutter |
| Sep 2, 2014 | 3 gal | Root Intrusion | — | Street/Curb and Gutter |
| Aug 16, 2014 | 26 gal | Other / Unknown | — | Separate Storm Drain |
| Jul 31, 2014 | 4 gal | Root Intrusion | — | Other (specify below) |
| Jun 15, 2014 | 6K gal | Root Intrusion | Yes | Surface Water |
| Jun 4, 2014 | 50 gal | Other / Unknown | — | Paved Surface;Street/Curb and Gutter |
| May 15, 2014 | 169 gal | Root Intrusion | — | Street/Curb and Gutter |
| Mar 12, 2014 | 80 gal | Root Intrusion | — | Paved Surface |
| Feb 9, 2014 | 4 gal | Other / Unknown | — | Street/Curb and Gutter |
| Jan 18, 2014 | 195 gal | Root Intrusion | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Dec 2, 2013 | 26 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Nov 4, 2013 | 38 gal | Root Intrusion | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface |
| Sep 6, 2013 | 366 gal | Other / Unknown | — | Paved Surface |
| Aug 26, 2013 | 1K gal | Root Intrusion | Yes | Other paved surface;Separate storm drain;Street/curb and gutter;Surface water |
| Aug 12, 2013 | 349 gal | Grease / FOG | — | Other paved surface;Separate storm drain;Street/curb and gutter |
| Jul 26, 2013 | 323 gal | Root Intrusion | — | Other paved surface;Separate storm drain;Street/curb and gutter |
| Jul 25, 2013 | 908 gal | Root Intrusion | — | Other paved surface;Separate storm drain |
| Jul 15, 2013 | 3K gal | Grease / FOG | Yes | Surface water;Unpaved surface |
| Jun 5, 2013 | 52 gal | Root Intrusion | — | Unpaved surface |
| Jun 3, 2013 | 2K gal | Root Intrusion | Yes | Other paved surface;Street/curb and gutter;Surface water |
| Apr 8, 2013 | 46 gal | Root Intrusion | — | Unpaved surface |
| Apr 5, 2013 | 66 gal | Grease / FOG | — | Other paved surface;Street/curb and gutter |
| Mar 29, 2013 | 442 gal | Equipment Failure | — | Separate storm drain;Street/curb and gutter |
| Mar 29, 2013 | 73 gal | Other / Unknown | — | Other paved surface;Unpaved surface |
| Mar 14, 2013 | 44 gal | Root Intrusion | — | Other paved surface;Street/curb and gutter |
| Mar 10, 2013 | 366 gal | Grease / FOG | — | Other paved surface;Street/curb and gutter |
| Mar 4, 2013 | 5 gal | Other / Unknown | — | Street/curb and gutter |
| Feb 4, 2013 | 62 gal | Root Intrusion | — | Unpaved surface |
| Jan 20, 2013 | 793 gal | Root Intrusion | — | Other paved surface;Street/curb and gutter;Unpaved surface |
| Jan 15, 2013 | 106 gal | Grease / FOG | — | Other paved surface;Street/curb and gutter |
| Jan 3, 2013 | 52 gal | Root Intrusion | — | Unpaved surface |
| Dec 16, 2012 | 75 gal | Root Intrusion | — | Other paved surface;Street/curb and gutter |
| Oct 28, 2012 | 3K gal | Equipment Failure | Yes | Other paved surface;Street/curb and gutter;Surface water;Unpaved surface |
| Sep 18, 2012 | 366 gal | Root Intrusion | — | Other paved surface;Street/curb and gutter;Unpaved surface |
| Aug 31, 2012 | 40 gal | Root Intrusion | — | Other paved surface;Street/curb and gutter;Unpaved surface |
| Aug 26, 2012 | 379 gal | Root Intrusion | — | Other paved surface;Street/curb and gutter;Unpaved surface |
| Aug 15, 2012 | 14K gal | Other / Unknown | — | Other paved surface;Separate storm drain |
| Jul 23, 2012 | 905 gal | Other / Unknown | — | Separate storm drain;Unpaved surface |
| Jun 9, 2012 | 300 gal | Equipment Failure | — | Street/curb and gutter;Unpaved surface |
| May 28, 2012 | 6K gal | Other / Unknown | — | Unpaved surface |
| May 3, 2012 | 960 gal | Other / Unknown | — | Other paved surface;Separate storm drain;Street/curb and gutter |
| Jan 28, 2012 | 900 gal | Equipment Failure | — | Other paved surface;Separate storm drain;Street/curb and gutter |
| Dec 22, 2011 | 300 gal | Root Intrusion | — | Unpaved surface |
| Dec 10, 2011 | 75 gal | Root Intrusion | — | Separate storm drain;Street/curb and gutter |
| Nov 27, 2011 | 3K gal | Grease / FOG | — | Other paved surface;Separate storm drain;Street/curb and gutter |
| Sep 23, 2011 | 50 gal | Root Intrusion | — | Street/curb and gutter |
| Sep 22, 2011 | 300 gal | Root Intrusion | — | Unpaved surface |
| Sep 12, 2011 | 150 gal | Root Intrusion | — | Street/curb and gutter |
| Aug 3, 2011 | 240 gal | Root Intrusion | — | Other paved surface;Street/curb and gutter;Unpaved surface |
| Jul 31, 2011 | 600 gal | Equipment Failure | — | Other paved surface;Separate storm drain;Street/curb and gutter;Unpaved surface |
| Jul 25, 2011 | 200 gal | Root Intrusion | — | Other paved surface;Separate storm drain;Street/curb and gutter |
| May 31, 2011 | 797 gal | Grease / FOG | — | Separate storm drain;Street/curb and gutter |
| Mar 27, 2011 | 200 gal | Root Intrusion | — | Street/curb and gutter |
| Feb 25, 2011 | 200 gal | Other / Unknown | — | Other paved surface;Separate storm drain;Street/curb and gutter |
| Feb 8, 2011 | 200 gal | Root Intrusion | — | Separate storm drain;Street/curb and gutter |
| Feb 1, 2011 | 50 gal | Grease / FOG | — | Separate storm drain;Street/curb and gutter |
| Feb 1, 2011 | 200 gal | Other / Unknown | — | Separate storm drain;Street/curb and gutter |
| Jan 17, 2011 | 100 gal | Root Intrusion | — | Unpaved surface |
| Jan 3, 2011 | 100 gal | Root Intrusion | Yes | Separate storm drain |
| Nov 28, 2010 | 500 gal | Grease / FOG | — | Other paved surface;Separate storm drain;Street/curb and gutter |
| Nov 5, 2010 | 200 gal | Other / Unknown | — | Separate storm drain;Street/curb and gutter |
| Aug 2, 2010 | 50 gal | Root Intrusion | — | Other paved surface;Storm drain;Street/curb and gutter |
| Jul 15, 2010 | 100 gal | Equipment Failure | — | Storm drain;Street/curb and gutter |
| Mar 25, 2010 | 100 gal | Equipment Failure | — | Street/curb and gutter;Unpaved surface |
| Mar 7, 2010 | 200 gal | Root Intrusion | — | Storm drain;Street/curb and gutter |
| Feb 16, 2010 | 500 gal | Equipment Failure | Yes | Storm drain;Street/curb and gutter;Surface water;Unpaved surface |
| Feb 3, 2010 | 500 gal | Root Intrusion | — | Unpaved surface |
| Dec 8, 2009 | 5 gal | Root Intrusion | — | Unpaved surface |
| Nov 16, 2009 | 300 gal | Equipment Failure | Yes | Unpaved surface |
| Nov 3, 2009 | 1 gal | Other / Unknown | — | Unpaved surface |
| Oct 28, 2009 | 100 gal | Other / Unknown | — | Other paved surface;Storm drain;Street/curb and gutter |
| Oct 20, 2009 | 200 gal | Equipment Failure | — | Unpaved surface |
| Sep 5, 2009 | 10 gal | Root Intrusion | — | Other paved surface |
| Aug 28, 2009 | 1 gal | Root Intrusion | — | Unpaved surface |
| Aug 28, 2009 | 5 gal | Root Intrusion | — | Unpaved surface |
| Aug 6, 2009 | 150 gal | Root Intrusion | — | Storm drain |
| Jul 20, 2009 | 5 gal | Root Intrusion | — | Other paved surface |
| Jul 20, 2009 | 5 gal | Root Intrusion | — | Street/curb and gutter |
| Jul 13, 2009 | 5 gal | Root Intrusion | — | Other paved surface |
| Jul 3, 2009 | 5 gal | Root Intrusion | — | Street/curb and gutter |
| May 1, 2009 | 250 gal | Equipment Failure | — | Storm drain |
| Mar 7, 2009 | 15 gal | Root Intrusion | — | Unpaved surface |
| Feb 11, 2009 | 100 gal | Equipment Failure | — | Unpaved surface |
| Jan 24, 2009 | 10 gal | Root Intrusion | — | Unpaved surface |
| Jan 22, 2009 | 500 gal | Root Intrusion | — | Other paved surface;Storm drain;Street/curb and gutter |
| Jan 14, 2009 | 50 gal | Root Intrusion | — | Other paved surface;Street/curb and gutter |
| Dec 21, 2008 | 10 gal | Root Intrusion | — | Unpaved surface |
| Dec 16, 2008 | 600 gal | Other / Unknown | — | Other paved surface;Storm drain;Street/curb and gutter;Unpaved surface |
| Oct 31, 2008 | 10 gal | Grease / FOG | — | Other paved surface |
| Oct 23, 2008 | 50 gal | Root Intrusion | — | Unpaved surface |
| Oct 6, 2008 | 200 gal | Grease / FOG | — | Other paved surface;Street/curb and gutter;Unpaved surface |
| Sep 22, 2008 | 350 gal | Root Intrusion | — | Other paved surface;Storm drain;Street/curb and gutter |
| Sep 13, 2008 | 5 gal | Equipment Failure | — | Other paved surface |
| Aug 4, 2008 | 300 gal | Root Intrusion | — | Other paved surface;Storm drain;Street/curb and gutter |
| Jul 14, 2008 | 5 gal | Root Intrusion | — | Unpaved surface |
| Jun 4, 2008 | 100 gal | Grease / FOG | — | Storm drain |
| May 23, 2008 | 15 gal | Root Intrusion | — | Unpaved surface |
| May 18, 2008 | 150 gal | Grease / FOG | — | Street/curb and gutter |
| May 10, 2008 | 24K gal | Equipment Failure | — | Street/curb and gutter |
| May 8, 2008 | 5 gal | Root Intrusion | — | Unpaved surface |
| Apr 28, 2008 | 5 gal | Root Intrusion | — | Unpaved surface |
| Apr 26, 2008 | 5 gal | Root Intrusion | — | Unpaved surface |
| Apr 25, 2008 | 5 gal | Root Intrusion | — | Unpaved surface |
| Apr 20, 2008 | 1K gal | Root Intrusion | Yes | Storm drain;Street/curb and gutter;Surface water |
| Mar 31, 2008 | 5 gal | Root Intrusion | — | Unpaved surface |
| Dec 1, 2007 | 470 gal | Root Intrusion | Yes | Storm drain;Street/curb and gutter;Surface water |
| Nov 1, 2007 | 600 gal | Equipment Failure | — | Separate storm drain;Street/curb and gutter |
Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.