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California · California (CIWQS)
San Dimas City
F
Usually reaches water
Reported events
46
Total volume
79K gal
Reached waterways
28 (61%)
Reporting since
2007
What caused the overflows
Other / Unknown
23
Root Intrusion
13
Equipment Failure
7
Grease / FOG
3
Reported overflow events (showing 46 of 46)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Jan 5, 2026 | 200 gal | Equipment Failure | Yes | Walnut Creek/San Gabriel River |
| Nov 10, 2025 | 2K gal | Equipment Failure | Yes | San Gabriel River |
| Oct 2, 2024 | 250 gal | Root Intrusion | — | — |
| Dec 10, 2023 | 300 gal | Grease / FOG | — | — |
| Dec 10, 2023 | 300 gal | Grease / FOG | — | — |
| Jul 16, 2023 | 500 gal | Equipment Failure | — | — |
| May 3, 2023 | 500 gal | Other / Unknown | Yes | Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Apr 17, 2023 | 10 gal | Other / Unknown | — | Other (specify below);Unpaved surface |
| Aug 22, 2020 | 5K gal | Other / Unknown | Yes | Drainage Channel;Separate Storm Drain;Street/Curb and Gutter |
| May 13, 2020 | 500 gal | Other / Unknown | Yes | Drainage Channel;Separate Storm Drain;Street/Curb and Gutter |
| Nov 11, 2019 | 7K gal | Other / Unknown | Yes | Drainage Channel;Separate Storm Drain |
| Nov 1, 2019 | 75 gal | Other / Unknown | — | Other (specify below);Paved Surface |
| Sep 25, 2019 | 720 gal | Other / Unknown | Yes | Other (specify below);Separate Storm Drain |
| Apr 6, 2019 | 1K gal | Other / Unknown | Yes | Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Mar 24, 2019 | 2K gal | Other / Unknown | Yes | Drainage Channel;Separate Storm Drain;Street/Curb and Gutter |
| Mar 6, 2019 | 400 gal | Equipment Failure | Yes | Other (specify below);Separate Storm Drain |
| Oct 28, 2018 | 5K gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Separate Storm Drain |
| Jun 12, 2018 | 500 gal | Other / Unknown | — | Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Feb 17, 2018 | 23K gal | Other / Unknown | Yes | Other (specify below);Separate Storm Drain |
| Nov 26, 2017 | 2K gal | Other / Unknown | — | Other (specify below);Unpaved surface |
| Aug 28, 2017 | 7K gal | Other / Unknown | Yes | Other (specify below);Separate Storm Drain |
| Aug 28, 2016 | 13K gal | Other / Unknown | Yes | Other (specify below);Separate Storm Drain;Street/Curb and Gutter;Surface Water |
| Sep 6, 2015 | 100 gal | Root Intrusion | — | Other (specify below);Unpaved surface |
| Dec 9, 2013 | 300 gal | Other / Unknown | Yes | Other (specify below) |
| Nov 9, 2012 | 50 gal | Root Intrusion | — | Other (specify below) |
| Oct 24, 2012 | 100 gal | Other / Unknown | Yes | Separate storm drain;Other (specify below) |
| Aug 5, 2012 | 10 gal | Equipment Failure | — | Unpaved surface;Other (specify below) |
| Mar 2, 2012 | 5 gal | Root Intrusion | Yes | Separate storm drain;Other (specify below) |
| Mar 1, 2012 | 200 gal | Root Intrusion | Yes | Separate storm drain;Other (specify below) |
| Jan 14, 2012 | 5K gal | Root Intrusion | Yes | Other (specify below) |
| Jun 15, 2011 | 300 gal | Grease / FOG | Yes | Separate storm drain;Other (specify below) |
| Feb 4, 2011 | 150 gal | Root Intrusion | Yes | Other (specify below) |
| Apr 30, 2010 | 50 gal | Other / Unknown | — | Unpaved surface |
| Apr 1, 2008 | 50 gal | Root Intrusion | — | Other (specify below) |
| Apr 1, 2008 | 600 gal | Root Intrusion | Yes | Other (specify below) |
| Apr 1, 2008 | 250 gal | Root Intrusion | — | Other (specify below) |
| Mar 6, 2008 | 200 gal | Root Intrusion | Yes | Storm drain |
| Nov 18, 2007 | 200 gal | Other / Unknown | Yes | Storm drain |
| Nov 18, 2007 | 200 gal | Other / Unknown | Yes | Storm drain |
| Sep 24, 2007 | 300 gal | Root Intrusion | Yes | Storm drain |
| Aug 26, 2007 | 100 gal | Equipment Failure | — | Other (specify below) |
| Jul 18, 2007 | 200 gal | Root Intrusion | Yes | Storm drain |
| Jul 9, 2007 | 25 gal | Other / Unknown | — | Other (specify below) |
| Jul 1, 2007 | 800 gal | Other / Unknown | Yes | Surface water |
| Mar 25, 2007 | 600 gal | Equipment Failure | — | Other (specify below) |
| Mar 22, 2007 | 400 gal | Other / Unknown | — | Other (specify below) |
Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.