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California · California (CIWQS)
Glendora City
F
Usually reaches water
Reported events
69
Total volume
80K gal
Reached waterways
44 (64%)
Reporting since
2007
What caused the overflows
Other / Unknown
31
Root Intrusion
25
Grease / FOG
12
Equipment Failure
1
Reported overflow events (showing 69 of 69)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Apr 27, 2026 | 24K gal | Equipment Failure | Yes | Big Dalton Wash and Walnut Creek, tributaries to the San Gabriel River. |
| Dec 17, 2025 | 200 gal | Root Intrusion | Yes | Little Dalton Wash, Big Dalton Wash, and Walnut Creek within the San Gabriel River watershed. |
| Apr 19, 2025 | 200 gal | Grease / FOG | Yes | San Gabriel River |
| Jun 14, 2024 | 7K gal | Grease / FOG | Yes | Big Dalton Wash, Walnut Creek Channel, San Gabriel River |
| Feb 17, 2024 | 12K gal | Grease / FOG | Yes | Big Dalton DB to Walnut Creek, San Gabriel River |
| Jan 20, 2024 | 600 gal | Root Intrusion | Yes | San Gabriel River |
| Apr 14, 2023 | 600 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Mar 15, 2023 | 900 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Feb 13, 2023 | 50 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Nov 4, 2022 | 6K gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Jun 22, 2022 | 3K gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| May 28, 2022 | 700 gal | Other / Unknown | — | Building or Structure;Other (specify below);Unpaved surface |
| Apr 15, 2022 | 600 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain |
| Nov 28, 2021 | 600 gal | Other / Unknown | Yes | Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Sep 13, 2021 | 700 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain |
| May 13, 2021 | 5K gal | Other / Unknown | — | Other (specify below) |
| Nov 27, 2020 | 350 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Jul 26, 2020 | 150 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Jun 24, 2020 | 700 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Feb 2, 2020 | 300 gal | Other / Unknown | — | Other (specify below);Paved Surface |
| Dec 15, 2019 | 400 gal | Other / Unknown | Yes | Drainage Channel;Separate Storm Drain;Street/Curb and Gutter |
| Oct 6, 2019 | 10 gal | Other / Unknown | — | Other (specify below) |
| Apr 20, 2019 | 1 gal | Other / Unknown | — | Other (specify below) |
| Feb 12, 2019 | 200 gal | Other / Unknown | Yes | Drainage Channel;Paved Surface;Separate Storm Drain;Unpaved surface |
| Dec 20, 2018 | 100 gal | Other / Unknown | — | Other (specify below) |
| Jun 3, 2018 | 600 gal | Other / Unknown | — | Other (specify below) |
| Jan 31, 2018 | 2K gal | Other / Unknown | Yes | Other (specify below);Separate Storm Drain |
| Nov 21, 2017 | 175 gal | Other / Unknown | — | Other (specify below) |
| Nov 1, 2017 | 75 gal | Other / Unknown | Yes | Other (specify below) |
| Feb 17, 2017 | 500 gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Jan 26, 2017 | 200 gal | Root Intrusion | — | Other (specify below) |
| Oct 21, 2016 | 50 gal | Other / Unknown | — | Other (specify below) |
| Jun 15, 2016 | 100 gal | Other / Unknown | — | Building or Structure;Other (specify below);Paved Surface;Unpaved surface |
| Jan 12, 2016 | 300 gal | Other / Unknown | Yes | Drainage Channel;Separate Storm Drain;Street/Curb and Gutter;Surface Water |
| Mar 30, 2015 | 100 gal | Root Intrusion | Yes | Other (specify below) |
| Jan 15, 2015 | 50 gal | Root Intrusion | — | Unpaved surface |
| Sep 9, 2014 | 25 gal | Root Intrusion | — | Other (specify below) |
| Feb 24, 2014 | 225 gal | Other / Unknown | Yes | Other (specify below) |
| Jan 14, 2014 | 250 gal | Root Intrusion | Yes | Other (specify below);Separate Storm Drain |
| Sep 25, 2013 | 30 gal | Root Intrusion | — | Building or Structure |
| Sep 25, 2013 | 5K gal | Root Intrusion | — | Building or Structure |
| Aug 3, 2013 | 1K gal | Grease / FOG | Yes | Separate storm drain;Other (specify below) |
| Apr 8, 2013 | 400 gal | Grease / FOG | Yes | Other (specify below) |
| Nov 22, 2012 | 300 gal | Root Intrusion | — | Building or structure |
| Sep 30, 2012 | 5 gal | Grease / FOG | — | Other (specify below) |
| Sep 28, 2012 | 1 gal | Grease / FOG | — | Other (specify below) |
| Feb 15, 2012 | 500 gal | Root Intrusion | Yes | Separate storm drain;Other (specify below) |
| Mar 3, 2011 | 120 gal | Root Intrusion | Yes | Separate storm drain;Other (specify below) |
| Nov 24, 2010 | 300 gal | Root Intrusion | Yes | Other (specify below) |
| Oct 3, 2010 | 200 gal | Root Intrusion | Yes | Storm drain;Other (specify below) |
| Mar 27, 2010 | 200 gal | Other / Unknown | — | Unpaved surface;Other (specify below) |
| Jan 3, 2010 | 300 gal | Root Intrusion | Yes | Storm drain;Other (specify below) |
| Dec 23, 2009 | 200 gal | Root Intrusion | — | Other (specify below) |
| Aug 1, 2009 | 200 gal | Root Intrusion | Yes | Other (specify below) |
| Mar 5, 2009 | 100 gal | Root Intrusion | Yes | Other (specify below) |
| Oct 10, 2008 | 300 gal | Root Intrusion | Yes | Other (specify below) |
| Dec 25, 2007 | 50 gal | Grease / FOG | — | Other (specify below) |
| Dec 25, 2007 | 50 gal | Grease / FOG | — | Other (specify below) |
| Dec 3, 2007 | 50 gal | Root Intrusion | Yes | Storm drain |
| Nov 5, 2007 | 300 gal | Root Intrusion | Yes | Storm drain |
| Sep 23, 2007 | 300 gal | Root Intrusion | Yes | Storm drain |
| Aug 19, 2007 | 800 gal | Root Intrusion | Yes | Other (specify below) |
| Jul 1, 2007 | 200 gal | Other / Unknown | Yes | Surface water |
| Jun 25, 2007 | 300 gal | Other / Unknown | — | Other (specify below) |
| Apr 25, 2007 | 20 gal | Root Intrusion | Yes | Storm drain |
| Mar 5, 2007 | 100 gal | Grease / FOG | Yes | Other (specify below) |
| Mar 5, 2007 | 50 gal | Grease / FOG | — | Other (specify below) |
| Mar 5, 2007 | 50 gal | Grease / FOG | — | Other (specify below) |
| Jan 23, 2007 | 200 gal | Root Intrusion | Yes | Other (specify below) |
Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.