All rankings
California · California (CIWQS)
Modesto City
B
Seldom reaches water
Reported events
505
Total volume
1.4M gal
Reached waterways
26 (5%)
Reporting since
2007
What caused the overflows
Grease / FOG
213
Other / Unknown
118
Root Intrusion
104
Equipment Failure
66
Capacity Issue
3
Rainfall / Flooding
1
Reported overflow events (showing 200 of 505)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| May 20, 2026 | 1K gal | Equipment Failure | — | — |
| Mar 23, 2026 | 330 gal | Equipment Failure | — | — |
| Mar 3, 2026 | 87 gal | Other / Unknown | — | — |
| Mar 20, 2025 | 149 gal | Root Intrusion | — | — |
| Jan 6, 2025 | 700 gal | Other / Unknown | — | — |
| Jan 6, 2025 | 350 gal | Grease / FOG | — | — |
| Dec 28, 2024 | 684 gal | Grease / FOG | — | — |
| Dec 1, 2024 | 3K gal | Grease / FOG | — | — |
| Nov 7, 2024 | 407 gal | Other / Unknown | — | — |
| Nov 5, 2024 | 732 gal | Grease / FOG | — | — |
| Sep 18, 2024 | 1K gal | Grease / FOG | — | — |
| Jul 5, 2024 | 500 gal | Equipment Failure | — | — |
| May 30, 2024 | 54 gal | Equipment Failure | Yes | Dry Creek (Tuolumne River tributary) |
| Mar 24, 2024 | 158 gal | Root Intrusion | — | — |
| Mar 18, 2024 | 2K gal | Other / Unknown | — | — |
| Feb 29, 2024 | 170 gal | Root Intrusion | — | — |
| Feb 17, 2024 | 254 gal | Root Intrusion | — | — |
| Dec 20, 2023 | 465 gal | Equipment Failure | — | — |
| Aug 24, 2023 | 344 gal | Other / Unknown | — | — |
| Aug 23, 2023 | 1K gal | Grease / FOG | — | — |
| Jun 10, 2023 | 50 gal | Root Intrusion | — | — |
| May 2, 2023 | 593 gal | Grease / FOG | — | Other (specify below);Street/Curb and Gutter |
| Apr 27, 2023 | 30 gal | Root Intrusion | — | Street/Curb and Gutter |
| Apr 17, 2023 | 129 gal | Root Intrusion | — | Street/Curb and Gutter |
| Apr 14, 2023 | 294 gal | Equipment Failure | Yes | Building or Structure;Paved Surface;Separate Storm Drain;Surface Water |
| Mar 27, 2023 | 1K gal | Root Intrusion | Yes | Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Surface Water |
| Feb 18, 2023 | 96 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Jan 25, 2023 | 535 gal | Grease / FOG | — | Other (specify below);Paved Surface |
| Jan 23, 2023 | 7 gal | Equipment Failure | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Jan 18, 2023 | 2 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Jan 17, 2023 | 104 gal | Root Intrusion | Yes | Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Surface Water |
| Dec 31, 2022 | 3K gal | Rainfall / Flooding | — | Unpaved surface |
| Dec 26, 2022 | 219 gal | Grease / FOG | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Dec 8, 2022 | 2 gal | Root Intrusion | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Nov 25, 2022 | 110 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter;Surface Water |
| Nov 24, 2022 | 40 gal | Grease / FOG | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Nov 21, 2022 | 114 gal | Grease / FOG | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Oct 24, 2022 | 14 gal | Equipment Failure | — | Paved Surface;Street/Curb and Gutter |
| Jul 24, 2022 | 9 gal | Root Intrusion | — | Unpaved surface |
| Jun 7, 2022 | 24 gal | Root Intrusion | — | Other (specify below);Street/Curb and Gutter |
| Apr 27, 2022 | 18 gal | Root Intrusion | — | Other (specify below);Paved Surface;Street/Curb and Gutter |
| Apr 25, 2022 | 25 gal | Root Intrusion | — | Other (specify below);Paved Surface |
| Feb 9, 2022 | 75 gal | Grease / FOG | — | Unpaved surface |
| Feb 6, 2022 | 2 gal | Root Intrusion | — | Other (specify below) |
| Jan 19, 2022 | 97 gal | Root Intrusion | — | Other (specify below);Paved Surface;Street/Curb and Gutter |
| Jan 15, 2022 | 1K gal | Grease / FOG | — | Other (specify below) |
| Jan 3, 2022 | 889 gal | Root Intrusion | — | Other (specify below) |
| Dec 30, 2021 | 360 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter |
| Dec 24, 2021 | 40 gal | Equipment Failure | — | Street/Curb and Gutter |
| Dec 9, 2021 | 765 gal | Root Intrusion | — | Other (specify below);Street/Curb and Gutter |
| Nov 22, 2021 | 585 gal | Other / Unknown | — | Other (specify below);Paved Surface;Unpaved surface |
| Oct 30, 2021 | 212K gal | Other / Unknown | Yes | Surface Water |
| Oct 24, 2021 | 212K gal | Capacity Issue | Yes | Surface Water |
| Oct 14, 2021 | 10 gal | Root Intrusion | — | Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Sep 28, 2021 | 61 gal | Grease / FOG | — | Unpaved surface |
| Aug 13, 2021 | 45 gal | Grease / FOG | — | Other (specify below);Street/Curb and Gutter |
| Jul 26, 2021 | 22 gal | Root Intrusion | — | Other (specify below);Street/Curb and Gutter |
| Jul 26, 2021 | 960 gal | Root Intrusion | — | Other (specify below);Street/Curb and Gutter |
| Jul 13, 2021 | 100 gal | Root Intrusion | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Jun 15, 2021 | 122 gal | Equipment Failure | — | Other (specify below) |
| Jun 10, 2021 | 270 gal | Equipment Failure | — | Other (specify below) |
| Jun 3, 2021 | 5 gal | Equipment Failure | — | Paved Surface;Street/Curb and Gutter |
| Jun 1, 2021 | 1 gal | Other / Unknown | — | Unpaved surface |
| May 29, 2021 | 15 gal | Grease / FOG | — | Street/Curb and Gutter |
| Mar 22, 2021 | 800 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter;Unpaved surface |
| Mar 19, 2021 | 267 gal | Other / Unknown | — | Other (specify below);Paved Surface;Street/Curb and Gutter |
| Feb 22, 2021 | 10 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Feb 3, 2021 | 15 gal | Equipment Failure | — | Other (specify below);Street/Curb and Gutter |
| Jan 4, 2021 | 25 gal | Root Intrusion | — | Paved Surface |
| Dec 14, 2020 | 150 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter |
| Oct 2, 2020 | 150 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Aug 2, 2020 | 9K gal | Grease / FOG | Yes | Surface Water |
| Jun 21, 2020 | 167K gal | Other / Unknown | Yes | Other (specify below);Surface Water |
| May 3, 2020 | 176 gal | Root Intrusion | — | Other (specify below);Unpaved surface |
| Feb 27, 2020 | 40 gal | Grease / FOG | — | Other (specify below);Street/Curb and Gutter |
| Feb 9, 2020 | 306 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter |
| Jan 23, 2020 | 16 gal | Grease / FOG | — | Street/Curb and Gutter |
| Jan 18, 2020 | 50 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Jan 2, 2020 | 65 gal | Root Intrusion | — | Street/Curb and Gutter |
| Dec 29, 2019 | 38 gal | Grease / FOG | — | Street/Curb and Gutter |
| Dec 24, 2019 | 423 gal | Grease / FOG | — | No |
| Dec 14, 2019 | 345 gal | Grease / FOG | — | Street/Curb and Gutter |
| Nov 28, 2019 | 308 gal | Grease / FOG | — | Street/Curb and Gutter |
| Nov 18, 2019 | 90 gal | Grease / FOG | — | Street/Curb and Gutter |
| Oct 23, 2019 | 4K gal | Other / Unknown | Yes | Drainage Channel;Other (specify below);Paved Surface;Street/Curb and Gutter;Surface Water |
| Sep 25, 2019 | 336 gal | Grease / FOG | — | Street/Curb and Gutter |
| Sep 23, 2019 | 78 gal | Root Intrusion | — | Street/Curb and Gutter |
| Sep 21, 2019 | 7K gal | Equipment Failure | — | Separate Storm Drain |
| Sep 16, 2019 | 10 gal | Grease / FOG | — | Paved Surface;Street/Curb and Gutter |
| Sep 4, 2019 | 6 gal | Equipment Failure | — | Street/Curb and Gutter |
| Aug 28, 2019 | 1 gal | Equipment Failure | — | Street/Curb and Gutter |
| Aug 7, 2019 | 124 gal | Grease / FOG | — | Street/Curb and Gutter |
| Jul 23, 2019 | 20 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Jul 23, 2019 | 20 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Jul 7, 2019 | 262 gal | Root Intrusion | — | Street/Curb and Gutter |
| May 23, 2019 | 50 gal | Grease / FOG | — | Other (specify below) |
| May 10, 2019 | 305 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| May 7, 2019 | 410 gal | Root Intrusion | — | Other (specify below) |
| Apr 25, 2019 | 2K gal | Root Intrusion | — | Other (specify below);Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Apr 9, 2019 | 1 gal | Equipment Failure | — | Street/Curb and Gutter |
| Apr 5, 2019 | 97 gal | Grease / FOG | — | Other (specify below) |
| Mar 24, 2019 | 2K gal | Grease / FOG | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Mar 20, 2019 | 118 gal | Equipment Failure | — | Other (specify below) |
| Mar 18, 2019 | 25 gal | Root Intrusion | — | Other (specify below) |
| Mar 15, 2019 | 5 gal | Equipment Failure | — | Street/Curb and Gutter |
| Mar 14, 2019 | 290 gal | Equipment Failure | — | Surface Water |
| Feb 14, 2019 | 143 gal | Root Intrusion | — | Unpaved surface |
| Feb 5, 2019 | 15 gal | Equipment Failure | — | Other (specify below) |
| Jan 31, 2019 | 2K gal | Grease / FOG | — | Other (specify below) |
| Jan 1, 2019 | 16 gal | Root Intrusion | — | Other (specify below);Other (specify below) |
| Dec 10, 2018 | 34 gal | Grease / FOG | — | Street/Curb and Gutter |
| Nov 26, 2018 | 29 gal | Equipment Failure | — | Street/Curb and Gutter |
| Oct 8, 2018 | 2K gal | Grease / FOG | — | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Oct 6, 2018 | 2K gal | Grease / FOG | — | Other (specify below);Street/Curb and Gutter |
| Sep 30, 2018 | 5 gal | Root Intrusion | — | Paved Surface;Street/Curb and Gutter |
| Sep 24, 2018 | 3K gal | Equipment Failure | — | Other (specify below) |
| Sep 3, 2018 | 50 gal | Root Intrusion | — | Paved Surface |
| Aug 26, 2018 | 30 gal | Equipment Failure | — | Street/Curb and Gutter |
| Jun 3, 2018 | 20 gal | Grease / FOG | — | Street/Curb and Gutter |
| May 30, 2018 | 25 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| May 26, 2018 | 20 gal | Root Intrusion | — | Other (specify below) |
| May 24, 2018 | 20 gal | Grease / FOG | — | Unpaved surface |
| May 22, 2018 | 250 gal | Grease / FOG | — | Unpaved surface |
| Feb 26, 2018 | 12 gal | Other / Unknown | — | Street/Curb and Gutter |
| Feb 15, 2018 | 742 gal | Other / Unknown | — | Street/Curb and Gutter |
| Feb 4, 2018 | 550 gal | Root Intrusion | — | Other (specify below);Street/Curb and Gutter |
| Feb 3, 2018 | 1K gal | Grease / FOG | — | Other (specify below) |
| Dec 18, 2017 | 58 gal | Root Intrusion | — | Street/Curb and Gutter |
| Jul 3, 2017 | 4 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Apr 28, 2017 | 15 gal | Root Intrusion | — | Other (specify below);Unpaved surface |
| Apr 10, 2017 | 400 gal | Root Intrusion | — | Other (specify below);Paved Surface;Street/Curb and Gutter |
| Jan 11, 2017 | 135 gal | Grease / FOG | — | Other (specify below) |
| Jan 1, 2017 | 99 gal | Grease / FOG | — | Other (specify below);Paved Surface;Separate Storm Drain |
| Nov 27, 2016 | 137 gal | Other / Unknown | — | Separate Storm Drain |
| Nov 18, 2016 | 10 gal | Grease / FOG | — | Other (specify below);Street/Curb and Gutter |
| Nov 6, 2016 | 123 gal | Grease / FOG | — | Other (specify below);Street/Curb and Gutter |
| Oct 28, 2016 | 464K gal | Capacity Issue | Yes | Drainage Channel;Surface Water |
| Sep 4, 2016 | 975 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Aug 15, 2016 | 15 gal | Grease / FOG | — | Other (specify below) |
| Jul 16, 2016 | 11 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter |
| Jun 3, 2016 | 90 gal | Grease / FOG | — | Other (specify below);Street/Curb and Gutter |
| Jun 2, 2016 | 95 gal | Equipment Failure | — | Street/Curb and Gutter |
| May 29, 2016 | 50 gal | Root Intrusion | — | Street/Curb and Gutter |
| Apr 24, 2016 | 3K gal | Root Intrusion | Yes | Drainage Channel |
| Apr 11, 2016 | 30 gal | Grease / FOG | — | Other (specify below);Paved Surface;Street/Curb and Gutter |
| Mar 6, 2016 | 5 gal | Equipment Failure | — | Street/Curb and Gutter |
| Jan 12, 2016 | 68 gal | Equipment Failure | — | Separate Storm Drain |
| Dec 31, 2015 | 100 gal | Root Intrusion | — | Separate Storm Drain |
| Dec 30, 2015 | 40 gal | Equipment Failure | — | Street/Curb and Gutter |
| Dec 25, 2015 | 17K gal | Grease / FOG | — | Other (specify below);Paved Surface;Street/Curb and Gutter |
| Dec 24, 2015 | 3K gal | Grease / FOG | Yes | Drainage Channel;Street/Curb and Gutter;Surface Water |
| Dec 20, 2015 | 2K gal | Equipment Failure | — | Separate Storm Drain |
| Dec 17, 2015 | 18 gal | Root Intrusion | — | Separate Storm Drain |
| Dec 9, 2015 | 594 gal | Grease / FOG | — | Other (specify below) |
| Dec 7, 2015 | 135 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Nov 27, 2015 | 136 gal | Grease / FOG | — | Drainage Channel;Paved Surface;Street/Curb and Gutter |
| Nov 23, 2015 | 1K gal | Grease / FOG | — | Other (specify below) |
| Nov 21, 2015 | 12 gal | Grease / FOG | — | Street/Curb and Gutter |
| Aug 17, 2015 | 45 gal | Equipment Failure | — | Unpaved surface |
| Apr 22, 2015 | 1 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter |
| Mar 21, 2015 | 50 gal | Root Intrusion | — | Other (specify below);Paved Surface |
| Feb 26, 2015 | 30 gal | Root Intrusion | — | Other (specify below) |
| Feb 9, 2015 | 25 gal | Root Intrusion | — | Unpaved surface |
| Feb 6, 2015 | 120 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter |
| Jan 29, 2015 | 50 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Jan 21, 2015 | 81 gal | Root Intrusion | — | Street/Curb and Gutter |
| Jan 19, 2015 | 5K gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Dec 16, 2014 | 1K gal | Equipment Failure | — | Other (specify below);Street/Curb and Gutter |
| Nov 25, 2014 | 120 gal | Grease / FOG | — | Paved Surface |
| Nov 14, 2014 | 60 gal | Other / Unknown | — | Unpaved surface |
| Nov 13, 2014 | 32 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Sep 4, 2014 | 160 gal | Equipment Failure | — | Other (specify below) |
| Jun 5, 2014 | 3K gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| May 17, 2014 | 3 gal | Root Intrusion | — | Street/Curb and Gutter |
| Mar 20, 2014 | 1K gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Mar 13, 2014 | 181 gal | Root Intrusion | — | Separate Storm Drain;Street/Curb and Gutter |
| Feb 1, 2014 | 759 gal | Grease / FOG | — | Other (specify below);Separate Storm Drain;Street/Curb and Gutter |
| Jan 4, 2014 | 30 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Dec 22, 2013 | 870 gal | Equipment Failure | — | Separate Storm Drain;Street/Curb and Gutter |
| Nov 24, 2013 | 180 gal | Grease / FOG | — | Street/Curb and Gutter |
| Nov 19, 2013 | 60 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Oct 20, 2013 | 55 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Oct 13, 2013 | 25 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Oct 11, 2013 | 160 gal | Grease / FOG | — | Street/Curb and Gutter |
| Oct 6, 2013 | 893 gal | Grease / FOG | — | Separate Storm Drain;Street/Curb and Gutter |
| Sep 22, 2013 | 408 gal | Grease / FOG | — | Separate Storm Drain |
| Aug 23, 2013 | 25 gal | Grease / FOG | — | Paved Surface;Unpaved surface |
| Jun 22, 2013 | 165 gal | Root Intrusion | — | Separate storm drain;Street/curb and gutter |
| Jun 10, 2013 | 50 gal | Equipment Failure | — | Street/curb and gutter |
| Jun 10, 2013 | 480 gal | Grease / FOG | — | Separate storm drain;Street/curb and gutter;Other (specify below) |
| Jun 7, 2013 | 875 gal | Other / Unknown | — | Separate storm drain;Street/curb and gutter |
| May 2, 2013 | 594 gal | Other / Unknown | — | Other (specify below);Unpaved surface;Separate storm drain;Street/curb and gutter |
| Apr 18, 2013 | 50 gal | Root Intrusion | — | Separate storm drain;Street/curb and gutter |
| Apr 9, 2013 | 60 gal | Other / Unknown | — | Street/curb and gutter |
| Apr 1, 2013 | 11 gal | Other / Unknown | — | Building or structure;Unpaved surface |
| Mar 29, 2013 | 10 gal | Other / Unknown | — | Building or structure |
| Mar 3, 2013 | 40 gal | Other / Unknown | — | Other (specify below) |
| Feb 18, 2013 | 175 gal | Grease / FOG | — | Separate storm drain;Street/curb and gutter;Other (specify below) |
| Feb 16, 2013 | 250 gal | Grease / FOG | — | Street/curb and gutter;Other (specify below) |
| Feb 7, 2013 | 4K gal | Grease / FOG | — | Street/curb and gutter;Other (specify below) |
Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.