What is non-stormwater discharge?

Non-stormwater discharge is discharge into the City’s MS4 system or natural waterways that is not due directly to a rainfall or snowmelt runoff event. Non-stormwater discharge includes groundwater exfiltration, mine pool discharge, discharges from potable water sources such as fire hydrants or waterline blow-off valves, sanitary sewer discharges either from publically-owned treatment works collection systems or on-lot septic systems. Many non-stormwater discharges are prohibited under the Township’s illicit discharge and connection ordinance.

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1. What is an MS4?
2. What is stormwater runoff?
3. What is non-stormwater discharge?
4. Why can stormwater runoff be a problem in the Township?
5. What is Hempfield Township doing about stormwater runoff?
6. What can residents of Hempfield Township do to improve stormwater quality in the Township?