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stormwater runoff right into a single pipe for remedy and disposal. (In different municipalities, these waste streams are dealt with separately.) In dry weather, a mixed sewer ordinarily carries a relatively low quantity of waste, delivering it to publicly owned remedy works, or POTWs for brief, which are designed to handle that flow. In plain phrases, when a combined sewer system is functioning properly, you possibly can usually trust that whenever you flush, the contents of the toilet bowl find yourself the place they’re supposed to go. The causes of those water-quality issues are complicated, as a result of the same pollution may be washed into surface water from agricultural land, industrial websites, and fertilized lawns dotted with pet waste, but the three to 10 billion gallons of untreated waste launched from our sewage-remedy vegetation per 12 months can not help but have an impact. As treatment crops age throughout the United States and as the country’s population grows, these releases have gotten more

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