![]() This data is helping us to understand where the system is not operating as it should, so that water companies can target investigations and investment. The Environment Agency works closely with water companies to ensure that they are closely monitoring and reporting back on their discharge activity. ![]() Combined sewer overflows (CSOs) are a necessary part of the existing sewerage system, preventing sewage from flooding homes and businesses. Overflows of diluted sewage during heavy rainfall are not a sign that the system is faulty. Combined sewer overflows (CSOs) were developed as overflow valves to reduce the risk of sewage backing up during heavy rainfall. This means that clean rainwater and waste water from toilets, bathrooms and kitchens are conveyed in the same pipe to a sewage treatment works.ĭuring heavy rainfall the capacity of these pipes can be exceeded, which means possible inundation of sewage works and the potential to back up and flood peoples’ homes, roads and open spaces, unless it is allowed to spill elsewhere. There are a number of points that are important to put this article into context.Įngland has a combined sewage system made up of hundreds of thousands of kilometres of sewers, built by the Victorians, in many urban centres. Recently we have seen prominent coverage in the Guardian which claims that untreated human waste was released into streams and rivers for more than 1.5 million hours in 2019.
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