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Sewage Spill Closure Causes 1999 – 2020
Figure 11 illustrates the distribution of different causes of sewage spills that resulted in ocean, harbor and bay water closures from 1999 – 2020. Sewage system pipeline blockages caused the majority (62%) of all ocean, harbor and bay water closures in Orange County for the 21-year period from 1999 - 2020. The remaining 38% of sewage closures were caused by pipeline breaks (12%), vessel pump stations (11%), pump station failures (9%), treatment plant discharges (2%), storm water surcharges (1%) and miscellaneous (3%).
Types of Pipeline Blockages Causing Closures 1999 – 2020
Figure 12 illustrates the distribution of different causes of pipeline blockages that resulted in ocean, harbor and bay water closures from 1999-2020. The infiltration of roots (31%) and deposition of grease (25%) into sewer pipes accounted for slightly more than half (56%) of the pipeline blockages that resulted in ocean, harbor and bay water closures in Orange County for the 21year period from 1999 – 2020. Other causes of pipeline blockages that resulted in water closures were debris (15%), miscellaneous (6%) and vandalism (1%). The remaining 22% of pipeline blockages that caused ocean, harbor and bay water closures were not able to be determined (unknown).
Causes of Ocean, Harbor and Bay Water Closures 1999 – 2020 Figure 11. Types of Pipeline Blockages Causing Closures 1999 – 2020 Figure 12.
