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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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
Higher water levels in River Falls, Wis., have been steadily receding, while other cities in the area have been coping with rising flood waters.…
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…
Chicago area faces flooding with heavy spring rains
Chicago area faces flooding with heavy spring rains
May 15 2018
On May 14, spring rains brought flooding and nickel-sized hail to the Chicago area. Lake County, Ill., experienced standing water and basement…
Apr 6 2018
The District of Columbia Water and Sewer Authority (DC Water) commissioned the first major component of the DC Clean Rivers Program ahead of the…
Mar 26 2018
The Metropolitan Sewer District of Greater Cincinnati (MSD) is implementing a solution known as the Lower Mill Creek Partial Remedy (LMCPR), designed…
Mar 23 2018
The city of Akron, Ohio, has proposed a sewer rehabilitation and green infrastructure plan to manage storm water and combined sewer overflows (CSOs…
Mar 21 2018
The U.S. EPA announced a settlement with Dole Food Co. Inc. for failing to close two large-capacity cesspools (LCC) at its Puuiki Beach Park property…
Jan 8 2018
The city of Portland, Maine has undergone massive improvements in efforts to improve combined sewage and storm water overflow into the Casco Bay. The…
Dec 21 2017
The city of Lancaster, Pa., agreed to comprehensive measures to end discharges of untreated sewage and other pollutants to local waterways from the…
Dec 18 2017
Camden, N.J., has announced plans to restore their storm water management plan and manage sewer overflow. The plan features increased green space,…
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