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California · California (CIWQS)
Thousand Oaks City
D
Frequently reaches water
Reported events
36
Total volume
304K gal
Reached waterways
14 (39%)
Reporting since
2007
What caused the overflows
Root Intrusion
16
Equipment Failure
9
Grease / FOG
6
Other / Unknown
5
Reported overflow events (showing 36 of 36)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Apr 17, 2026 | 75 gal | Grease / FOG | — | — |
| Apr 17, 2026 | 75 gal | Grease / FOG | — | — |
| Feb 21, 2026 | 11K gal | Root Intrusion | Yes | Arroyo Conejo Creek. |
| Sep 20, 2025 | 545 gal | Root Intrusion | Yes | Olsen Channel and Arroyo Conejo Creek. |
| May 12, 2025 | 147 gal | Root Intrusion | — | — |
| Mar 15, 2025 | 250K gal | Equipment Failure | Yes | North Fork Arroyo Conejo Creek. |
| Nov 8, 2024 | 590 gal | Grease / FOG | Yes | South Branch Arroyo Conejo |
| Jun 18, 2024 | 135 gal | Equipment Failure | — | — |
| Apr 13, 2024 | 5K gal | Grease / FOG | Yes | Lang Creek and Arroyo Conejo |
| Oct 24, 2023 | 832 gal | Equipment Failure | Yes | Waverly Channel |
| Mar 27, 2023 | 755 gal | Root Intrusion | Yes | Paved Surface;Street/Curb and Gutter |
| Feb 1, 2023 | 2K gal | Root Intrusion | — | Building or Structure;Separate Storm Drain;Street/Curb and Gutter |
| Feb 5, 2022 | 30 gal | Root Intrusion | — | Unpaved surface |
| Nov 26, 2021 | 20K gal | Root Intrusion | Yes | Surface Water |
| Sep 10, 2021 | 100 gal | Root Intrusion | — | Paved Surface |
| May 24, 2021 | 800 gal | Other / Unknown | — | Unpaved surface |
| Jan 17, 2021 | 1 gal | Root Intrusion | — | Unpaved surface |
| Nov 11, 2020 | 50 gal | Root Intrusion | — | Paved Surface |
| Oct 30, 2020 | 200 gal | Equipment Failure | — | Unpaved surface |
| Feb 3, 2020 | 100 gal | Grease / FOG | — | Street/Curb and Gutter |
| Feb 2, 2018 | 25 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Mar 6, 2017 | 500 gal | Equipment Failure | — | Building or Structure |
| Jun 20, 2014 | 500 gal | Root Intrusion | Yes | Drainage Channel |
| Apr 21, 2014 | 200 gal | Equipment Failure | — | Building or Structure |
| Feb 13, 2013 | 200 gal | Equipment Failure | — | Paved Surface |
| Oct 23, 2012 | 500 gal | Root Intrusion | — | Street/curb and gutter |
| May 19, 2011 | 250 gal | Grease / FOG | Yes | Unpaved surface |
| Dec 2, 2010 | 500 gal | Other / Unknown | Yes | Surface water |
| Aug 30, 2010 | 5K gal | Other / Unknown | Yes | Building or structure |
| Sep 16, 2009 | 750 gal | Other / Unknown | — | Unpaved surface |
| Oct 24, 2008 | 700 gal | Root Intrusion | Yes | Unpaved surface |
| Jul 30, 2008 | 20 gal | Root Intrusion | — | Other (specify below) |
| Nov 9, 2007 | 850 gal | Root Intrusion | Yes | Separate storm drain |
| Mar 2, 2007 | 3K gal | Other / Unknown | — | Street/curb and gutter |
| Mar 2, 2007 | 85 gal | Equipment Failure | — | Street/curb and gutter |
| Mar 2, 2007 | — | Equipment Failure | — | Street/curb and gutter |
Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.