When must Category 4 SSO spills be reported?

The correct answer indicates that Category 4 Sanitary Sewer Overflows (SSOs) must be reported by April 1 of the following calendar year. This reflects regulatory guidelines that require a structured reporting timeframe for certain categories of SSOs to facilitate organization and environmental oversight.

Category 4 SSOs typically refer to situations that may not pose an immediate public health risk or environmental harm, allowing for a longer reporting window. By requiring reports by a specific date in the following year, this system enables regulatory bodies to compile and assess SSO data comprehensively, ensuring that trends can be evaluated and appropriate actions can be taken if necessary.

Other timeframes, such as 24 hours, end of the year, or immediate reporting, are generally reserved for more severe spill classifications where immediate action or communication is critical to mitigate risks to public health or environmental safety.