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What is a Combined Sewer Overflow Combined Sewer Overflows (CSO's) are common in cities the age of Newark. Sewers in Newark originally were just ditches or large pipes that took household sewage to the river. In the 1940's, Newarks first sewer plant was built and in the following years sewer pipes were tied into a system that ended at the wastewater treatment plant. Some pipes were left as a pressure outlet to the river in times when heavy rainfall resulted in higher than normal pressures developing in the sewer pipes that would result in backups into homes. To prevent backups these pipes were left as a pressure release to prevent all but the most extreme rainfalls causing backups into homes. The Ohio EPA under direction from US EPA have mandated that all CSO's be removed. This page contains information on the locations and plans to remove these CSO's from the system. Current laws require the removal of these CSO's to the river by using construction to increase the capacity of the sewer system to accept rainfall events. Current and future construction will be listed on this page until all CSO's in the City of Newark are removed. Information concerning health concerns and rainfall events will also be listed on this page. Predicting Wet Weather Sewer Overflows At this time, Newark does not have a fail-safe method for predicting or monitoring combined sewer overflows on a real-time basis. There are many factors that can trigger overflows, including the length and intensity of rainfall, prior ground moisture conditions, sewer blockages, etc. The methods for predicting CSO overflows are expected to improve as Newark implements it's Long-Term Control Plan Update. In the meantime, Newark will issue a CSO warning whenever its weather forecasting service predicts or records a rainfall of .25 inches or more in Licking County or whenever the water levels in area rivers and streams are elevated such that a CSO overflow is likely to occur. The warning will remain in place for 72 hours after a rainfall occurs and 72 hours after water levels in area rivers and streams have returned to normal elevation and CSO discharges related to elevated river and stream levels are known or believed to have ceased in Licking County. To view a CSO Interactive Map (locations of CSO's in Newark) or to recieve an E-mail notification of CSO events please click on the link below. http://gis.fmsm.com/website/newark_map/ 
CSO 1006 and CSO 1013 Modification Project Notice of Issuance of a Limited Environmental Review CSO 1030 SEPARATION PROJECT CSO 1030 Separation Project Informational Brochure 
For a pdf downloadable map : click here
Annual Sanitary Sewer Overflow Report
2009 SSO Report
City of Newark Division of Water and Wastewater
34 S. Fifth St. || Newark, OH 43055
Phone: 740.670.7940 || Email: wateradm@newarkohiowater.net
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