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California · California (CIWQS)
Hollister City
A
Rarely reaches water
Reported events
126
Total volume
734K gal
Reached waterways
2 (2%)
Reporting since
2007
What caused the overflows
Grease / FOG
86
Other / Unknown
21
Equipment Failure
18
Root Intrusion
1
Reported overflow events (showing 126 of 126)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Sep 16, 2025 | 720 gal | Grease / FOG | — | — |
| Sep 5, 2025 | 242 gal | Equipment Failure | — | — |
| Nov 5, 2024 | 270 gal | Equipment Failure | — | — |
| Jul 22, 2023 | 100 gal | Grease / FOG | — | — |
| Jun 12, 2023 | 100 gal | Grease / FOG | — | — |
| Aug 28, 2022 | 37 gal | Equipment Failure | — | Paved Surface |
| Aug 28, 2022 | 37 gal | Equipment Failure | — | Paved Surface |
| Jun 2, 2022 | 4K gal | Equipment Failure | — | Unpaved surface |
| Jan 16, 2022 | 356 gal | Equipment Failure | — | Street/Curb and Gutter |
| Jan 16, 2022 | 356 gal | Equipment Failure | — | Street/Curb and Gutter |
| Jan 16, 2022 | 356 gal | Equipment Failure | — | Street/Curb and Gutter |
| Dec 8, 2021 | 151 gal | Equipment Failure | — | Street/Curb and Gutter |
| Nov 6, 2021 | 127 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Nov 14, 2020 | 100 gal | Equipment Failure | — | Paved Surface;Street/Curb and Gutter |
| Oct 19, 2020 | 150 gal | Equipment Failure | — | Paved Surface;Street/Curb and Gutter |
| Jul 21, 2020 | 780 gal | Equipment Failure | — | Street/Curb and Gutter |
| Jun 29, 2020 | 85 gal | Grease / FOG | — | Street/Curb and Gutter |
| Jun 29, 2020 | 85 gal | Grease / FOG | — | Street/Curb and Gutter |
| May 13, 2020 | 69 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| May 11, 2020 | 11 gal | Equipment Failure | — | Building or Structure |
| Mar 28, 2020 | 213 gal | Grease / FOG | — | Street/Curb and Gutter |
| Feb 24, 2020 | 230 gal | Grease / FOG | — | Separate Storm Drain |
| Dec 21, 2019 | 112 gal | Other / Unknown | — | Unpaved surface |
| Dec 5, 2019 | 50 gal | Other / Unknown | — | Paved Surface |
| Aug 23, 2019 | 27K gal | Equipment Failure | — | Unpaved surface |
| Jun 17, 2019 | 78 gal | Equipment Failure | — | Paved Surface |
| Dec 15, 2018 | 37 gal | Grease / FOG | — | Paved Surface |
| Dec 2, 2018 | 779 gal | Grease / FOG | — | Street/Curb and Gutter |
| Apr 29, 2018 | 300 gal | Grease / FOG | — | Separate Storm Drain |
| Feb 2, 2018 | 32 gal | Grease / FOG | — | Paved Surface |
| Oct 10, 2017 | 200 gal | Grease / FOG | — | Paved Surface |
| Jun 18, 2017 | 150 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Jan 16, 2017 | 40 gal | Grease / FOG | — | Paved Surface |
| Sep 6, 2016 | 339K gal | Other / Unknown | Yes | Other (specify below) |
| Jul 26, 2016 | 346K gal | Other / Unknown | Yes | Surface Water |
| Nov 26, 2015 | 100 gal | Root Intrusion | — | Paved Surface |
| Sep 1, 2015 | 20 gal | Equipment Failure | — | Paved Surface |
| Jul 13, 2015 | 75 gal | Grease / FOG | — | Paved Surface;Street/Curb and Gutter |
| Feb 22, 2015 | 150 gal | Grease / FOG | — | Street/Curb and Gutter |
| Feb 16, 2015 | 150 gal | Grease / FOG | — | Street/Curb and Gutter |
| Dec 7, 2014 | 100 gal | Grease / FOG | — | Paved Surface |
| Oct 28, 2014 | 20 gal | Grease / FOG | — | Street/Curb and Gutter |
| Sep 4, 2014 | 40 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Sep 1, 2014 | 10 gal | Grease / FOG | — | Paved Surface |
| May 24, 2014 | 4 gal | Grease / FOG | — | Separate Storm Drain |
| Feb 10, 2014 | 10 gal | Grease / FOG | — | Street/Curb and Gutter |
| Feb 9, 2014 | 6 gal | Grease / FOG | — | Street/Curb and Gutter |
| Dec 11, 2013 | 6 gal | Grease / FOG | — | Paved Surface |
| Nov 21, 2013 | 50 gal | Grease / FOG | — | Street/Curb and Gutter |
| Aug 10, 2013 | 100 gal | Grease / FOG | — | Paved Surface;Street/Curb and Gutter |
| Feb 17, 2013 | 20 gal | Grease / FOG | — | Separate storm drain |
| Jun 30, 2012 | 10 gal | Grease / FOG | — | Street/curb and gutter |
| May 20, 2012 | 4 gal | Grease / FOG | — | Street/curb and gutter |
| Apr 1, 2012 | 2 gal | Grease / FOG | — | Street/curb and gutter |
| Mar 18, 2012 | 45 gal | Grease / FOG | — | Street/curb and gutter |
| Feb 15, 2012 | 2 gal | Grease / FOG | — | Street/curb and gutter |
| Jan 22, 2012 | 5 gal | Grease / FOG | — | Street/curb and gutter |
| Nov 23, 2011 | 15 gal | Grease / FOG | — | Street/curb and gutter |
| Nov 12, 2011 | 100 gal | Grease / FOG | — | Combined storm drain (combined CS only) |
| Sep 22, 2011 | 5 gal | Grease / FOG | — | Other paved surface |
| Mar 26, 2011 | 45 gal | Grease / FOG | — | Street/curb and gutter |
| Mar 17, 2011 | 10 gal | Grease / FOG | — | Street/curb and gutter |
| Mar 17, 2011 | 20 gal | Grease / FOG | — | Street/curb and gutter |
| Nov 29, 2010 | 50 gal | Grease / FOG | — | Street/curb and gutter |
| Nov 15, 2010 | 300 gal | Grease / FOG | — | Street/curb and gutter |
| Oct 1, 2010 | 10 gal | Grease / FOG | — | Other paved surface |
| Sep 18, 2010 | 20 gal | Grease / FOG | — | Street/curb and gutter |
| Sep 16, 2010 | 10 gal | Grease / FOG | — | Street/curb and gutter |
| Aug 4, 2010 | 200 gal | Other / Unknown | — | Other (specify below) |
| May 20, 2010 | 35 gal | Grease / FOG | — | Other paved surface |
| Jan 15, 2010 | 5 gal | Grease / FOG | — | Other paved surface |
| Nov 13, 2009 | 100 gal | Grease / FOG | — | Storm drain;Street/curb and gutter |
| Sep 27, 2009 | 20 gal | Grease / FOG | — | Other paved surface |
| Sep 18, 2009 | 25 gal | Grease / FOG | — | Other paved surface |
| Sep 14, 2009 | 20 gal | Grease / FOG | — | Other paved surface |
| Sep 8, 2009 | 5 gal | Grease / FOG | — | Other paved surface |
| Aug 28, 2009 | 20 gal | Grease / FOG | — | Other paved surface;Street/curb and gutter |
| Jul 16, 2009 | 100 gal | Grease / FOG | — | Other paved surface;Street/curb and gutter |
| Feb 28, 2009 | 5 gal | Grease / FOG | — | Street/curb and gutter |
| Feb 10, 2009 | 100 gal | Grease / FOG | — | Other paved surface |
| Feb 9, 2009 | 5 gal | Grease / FOG | — | Street/curb and gutter |
| Feb 7, 2009 | 300 gal | Grease / FOG | — | Other paved surface |
| Jan 23, 2009 | 500 gal | Other / Unknown | — | Other paved surface |
| Jan 7, 2009 | 200 gal | Grease / FOG | — | Other paved surface |
| Dec 20, 2008 | 200 gal | Grease / FOG | — | Other paved surface |
| Dec 7, 2008 | 75 gal | Grease / FOG | — | Other paved surface |
| Dec 7, 2008 | 50 gal | Grease / FOG | — | Other paved surface |
| Dec 6, 2008 | 300 gal | Other / Unknown | — | Other paved surface |
| Dec 6, 2008 | 10 gal | Grease / FOG | — | Building or structure;Other paved surface |
| Oct 21, 2008 | 100 gal | Grease / FOG | — | Street/curb and gutter |
| Oct 17, 2008 | 20 gal | Grease / FOG | — | Street/curb and gutter |
| Jul 12, 2008 | 10 gal | Other / Unknown | — | Street/curb and gutter |
| Apr 23, 2008 | 25 gal | Grease / FOG | — | Street/curb and gutter |
| Apr 2, 2008 | 10 gal | Grease / FOG | — | Street/curb and gutter |
| Apr 1, 2008 | 5 gal | Other / Unknown | — | Street/curb and gutter |
| Mar 31, 2008 | 8 gal | Grease / FOG | — | Street/curb and gutter |
| Mar 28, 2008 | 5 gal | Grease / FOG | — | Street/curb and gutter |
| Feb 28, 2008 | 25 gal | Other / Unknown | — | Street/curb and gutter |
| Feb 17, 2008 | 15 gal | Grease / FOG | — | Street/curb and gutter |
| Jan 17, 2008 | 10 gal | Other / Unknown | — | Street/curb and gutter |
| Dec 27, 2007 | 10 gal | Grease / FOG | — | Street/curb and gutter |
| Dec 16, 2007 | 10 gal | Grease / FOG | — | Street/curb and gutter |
| Dec 10, 2007 | 5 gal | Other / Unknown | — | Street/curb and gutter |
| Nov 28, 2007 | 5 gal | Grease / FOG | — | Street/curb and gutter |
| Nov 24, 2007 | 50 gal | Grease / FOG | — | Other paved surface |
| Nov 18, 2007 | 10 gal | Other / Unknown | — | Other paved surface |
| Nov 12, 2007 | 20 gal | Grease / FOG | — | Street/curb and gutter |
| Nov 9, 2007 | 100 gal | Grease / FOG | — | Street/curb and gutter |
| Nov 4, 2007 | 30 gal | Other / Unknown | — | Street/curb and gutter |
| Oct 27, 2007 | 10 gal | Grease / FOG | — | Street/curb and gutter |
| Oct 25, 2007 | 10 gal | Other / Unknown | — | Street/curb and gutter |
| Oct 23, 2007 | 100 gal | Other / Unknown | — | Street/curb and gutter |
| Oct 1, 2007 | 100 gal | Grease / FOG | — | Street/curb and gutter |
| Sep 11, 2007 | 50 gal | Other / Unknown | — | Street/curb and gutter |
| Sep 11, 2007 | 5 gal | Grease / FOG | — | Street/curb and gutter |
| Sep 9, 2007 | 50 gal | Other / Unknown | — | Street/curb and gutter |
| Sep 8, 2007 | 30 gal | Other / Unknown | — | Unpaved surface |
| Sep 6, 2007 | 100 gal | Grease / FOG | — | Street/curb and gutter |
| Aug 31, 2007 | 8K gal | Equipment Failure | — | Unpaved surface |
| Jul 8, 2007 | 10 gal | Equipment Failure | — | Other paved surface |
| Jul 3, 2007 | 10 gal | Grease / FOG | — | Street/curb and gutter |
| Jun 3, 2007 | 5 gal | Grease / FOG | — | Street/curb and gutter |
| May 27, 2007 | 2 gal | Other / Unknown | — | Street/curb and gutter |
| May 18, 2007 | 50 gal | Grease / FOG | — | Other paved surface;Street/curb and gutter |
| May 7, 2007 | 20 gal | Other / Unknown | — | Other paved surface |
| May 5, 2007 | 5 gal | Grease / FOG | — | Other paved surface |
Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.