Combined Sewer Overflow

The discharge of wastewater and storm water from a combined sewer system (when storm water and sanitary sewage run through the same lines) directly into the environment, most commonly caused by heavy rainfall events, which can cause a massive influx of storm water into sewerage lines.
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Nov 5 2019
More than 4.7 million gal of untreated storm water flowed into Vermont streams, rivers and lakes after a Halloween storm. The Halloween storm caused…
Oct 29 2019
Underneath the new pedestrian plaza in Spokane, Wash., is a combined sewer overflow (CSO) tank, which has caused the closure of the Monroe Street…
Oct 22 2019
Officials at Harrisburg, Pa. water and sewer authority are planning to use a $13 million state loan to reduce the amount of untreated stormwater…
Until this latest rain MMSD figures show that 99.5% of wastewater volume has been treated in 2019.
Until this latest rain MMSD figures show that 99.5% of wastewater volume has been treated in 2019.
Sep 23 2019
After torrential rain swept through the Milwaukee area on Sept. 12, 282 million gallons of wastewater and storm water were sent into local waterways…
Aug 9 2019
A state program is aiding Hermitage, Penn., officials with pipe inspection and mapping of their storm water system. According to The Herald, the firm…
Aug 6 2019
Lynchburg, Va., uses a combined sewer system that carries both sanitary sewer flow and storm water to the Lynchburg Regional Wastewater Treatment…
Jul 17 2019
The city of Frederick, Md., wastewater treatment plant is seeking greater capacity after rainfall lead to a sewage release.  The city and surrounding…
May 9 2019
The Water Environment Federation's (WEF) Stormwater Institute released the results of a survey entitled the National Municipal Separate Storm Sewer…
In River Fall, Wis., storm water ponds help prevent rising water unlike other area towns
In River Fall, Wis., storm water ponds help prevent rising water unlike other area towns.
Apr 3 2019
River Falls, Wis. water levels have been receding and other cities in the area have been coping with the rising flood waters. According to the River…
StormSensor CEO Erin Rothman installs the system in Jersey City.
StormSensor CEO Erin Rothman installs the system in Jersey City.
Jan 28 2019
Accurately quantifying the problem is one of the biggest challenges to successfully controlling combined sewage overflows (CSOs). The most recent…
Jan 23 2019
The Holyoke, Mass., city council approved a $8.9 million bond for the Jackson Street Area Sewer Separation Project to minimize combined sewer…
DC Water announced the Anacostia River Tunnel has been improving storm water quality in the watershed
DC Water announced the Anacostia River Tunnel has been improving storm water quality in the watershed
Jan 16 2019
The District of Columbia Water and Sewer Authority (DC Water) announced that the Anacostia River Tunnel kept more than 4.5 billion gal of combined…
Combined sewer overflows triggered by New Year's Eve rains in Atlanta area
Combined sewer overflows triggered by New Year's Eve rains in Atlanta area
Jan 3 2019
On New Year’s Eve, a pump failure at a water treatment plant in Cobb County, Ga., caused untreated sewage and storm water to flow into one of the…
Dec 4 2018
The lake that Spring Lake Park in Omaha, Neb., was named after silted-in during the 1930s, but recently was recreated as part of Omaha’s Combined…
New storm water plan proposed in Missouri town
New storm water plan proposed in Missouri town
Dec 3 2018
The Columbia, Mo., city council is considering a 20-year plan that would dictate how the city manages storm water and wastewater. If approved, the…
Texas floods trigger bridge collapse
Texas floods trigger bridge collapse
Oct 17 2018
On Oct. 16, the 2900 bridge over the Llano River in Kingsland, Texas, collapsed due to flooding. Several days of heavy rainfall led up to the…
Each clarifier can treat 83.3 mgd.
Each clarifier can treat 83.3 mgd.
Sep 26 2018
In the early morning April 15, 2018, a strong line of storms dropped 2 to 3 in. of rain on the the Washington, D.C., area. Just a few hours later,…
The system allows the basin to capture approximately 70,000 gal of runoff during a typical rainfall event.
The system allows the basin to capture approximately 70,000 gal of runoff during a typical rainfall event.
Sep 26 2018
Combined sewer systems (CSS) exist in as many as 860 communities across the nation, and these aging sewer systems account for an estimated 850…
Chicago experiences record floods and rainfall for May
Chicago experiences record floods and rainfall for May
May 31 2018
On May 30, the remnants of Subtropical Storm Alberto hit Chicago, causing record levels of rainfall and substantial flooding. 7.64 in. of rain were…
Understanding the MEP compliance standard in MS4 permitting
Understanding the MEP compliance standard in MS4 permitting
May 25 2018
Over the past decade, municipalities that own or operate a municipal separate storm sewer system (MS4) have faced a trend of expanding MS4 permits…
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