Combined Sewer Overflows

Please select an option on the left to view Current or Previous CSO notifications. 

Combined sewer overflow (CSO) notifications are distributed by the Lynn Water and Sewer Commission.
To register for Lynn notifications, click here.

Combined sewer overflow were built as part of sewer collection systems that were designed to carry both sewage and stormwater in the same pipe. When there is not a lot of stormwaters, this mix is transported to a wastewater treatment plant where it is processed.

For more information about Massachusetts role in Sanitary Sewer Systems & Combined Sewer Overflows, please visit:
Mass.gov - Sanitary Sewer Systems & Combined Sewer Overflows

LWSC – Public Advisory Notification
July 25, 2024 3:25 PM – [CSO-005]
Combined Sewer Overflow – Cessation Notification
Please be advised that Combined Sewer Overflows due to heavy rainfall, have ceased at 3:25 PM on July 25, 2024 from the Lynn Water & Sewer Commission combined sewer system into surface waters of the Lynn Harbor. As of this notification, the CSO discharge has ceased. The overflow consists, or likely consists, of untreated or partially treated sewage and waste. Avoid contact with these water bodies for 48 hours after the discharge or overflow ceases due to increased health risks from bacteria and other pollutants.

Please visit our website https://www.lynnwatersewer.org/237/Combined-Sewer-Overflows-CSOs for more information on whether specific resource areas, such as bathing or beaches, are affected. The website also includes a real time interactive map that provides the status for each CSO.  

CSO Notification Summary
Permittee Issuing Notification: Lynn Water & Sewer Commission
For more information regarding:
• Approximate Duration of Discharge
• Estimated Volume of Discharge at Time of Notification
Click here: LWSC CSO Map https://bit.ly/42Hrf6f 
 
Affected or Potentially Affected Receiving Waters and Municipalities:
Municipalities: 
• Saugus
• Nahant
• Revere
• MWRA
• Swampscott

Receiving Waters: 
Lynn Harbor

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LWSC – Public Advisory Notification
July 25, 2024 4:35 PM – [CSO-003]
Combined Sewer Overflow – Cessation Notification
Please be advised that Combined Sewer Overflows due to heavy rainfall, have ceased at 4:35 PM on July 25, 2024 from the Lynn Water & Sewer Commission combined sewer system into surface waters of the The Saugus River and Lynn Harbor. As of this notification, the CSO discharge has ceased. The overflow consists, or likely consists, of untreated or partially treated sewage and waste. Avoid contact with these water bodies for 48 hours after the discharge or overflow ceases due to increased health risks from bacteria and other pollutants.

Please visit our website https://www.lynnwatersewer.org/237/Combined-Sewer-Overflows-CSOs for more information on whether specific resource areas, such as bathing or beaches, are affected. The website also includes a real time interactive map that provides the status for each CSO.  

CSO Notification Summary
Permittee Issuing Notification: Lynn Water & Sewer Commission
For more information regarding:
• Approximate Duration of Discharge
• Estimated Volume of Discharge at Time of Notification
Click here: LWSC CSO Map https://bit.ly/42Hrf6f 
 
Affected or Potentially Affected Receiving Waters and Municipalities:
Municipalities: 
• Saugus
• Nahant
• Revere
• MWRA
• Swampscott

Receiving Waters: 
The Saugus River and Lynn Harbor

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LWSC – Public Advisory Notification
July 25, 2024 3:30 PM – [CSO-004]
Combined Sewer Overflow – Cessation Notification
Please be advised that Combined Sewer Overflows due to heavy rainfall, have ceased at 3:30 PM on July 25, 2024 from the Lynn Water & Sewer Commission combined sewer system into surface waters of the Lynn Harbor. As of this notification, the CSO discharge has ceased. The overflow consists, or likely consists, of untreated or partially treated sewage and waste. Avoid contact with these water bodies for 48 hours after the discharge or overflow ceases due to increased health risks from bacteria and other pollutants.

Please visit our website https://www.lynnwatersewer.org/237/Combined-Sewer-Overflows-CSOs for more information on whether specific resource areas, such as bathing or beaches, are affected. The website also includes a real time interactive map that provides the status for each CSO.  

CSO Notification Summary
Permittee Issuing Notification: Lynn Water & Sewer Commission
For more information regarding:
• Approximate Duration of Discharge
• Estimated Volume of Discharge at Time of Notification
Click here: LWSC CSO Map https://bit.ly/42Hrf6f 
 
Affected or Potentially Affected Receiving Waters and Municipalities:
Municipalities: 
• Saugus
• Nahant
• Revere
• MWRA
• Swampscott

Receiving Waters: 
Lynn Harbor
---------------------------------------------
LWSC – Public Advisory Notification
July 25, 2024 2:35 PM – [CSO-006A]
Combined Sewer Overflow – Cessation Notification
Please be advised that Combined Sewer Overflows due to heavy rainfall, have ceased at 2:35 PM on July 25, 2024 from the Lynn Water & Sewer Commission combined sewer system into surface waters of the Nahant Bay and King's Beach. As of this notification, the CSO discharge has ceased. The overflow consists, or likely consists, of untreated or partially treated sewage and waste. Avoid contact with these water bodies for 48 hours after the discharge or overflow ceases due to increased health risks from bacteria and other pollutants.

Please visit our website https://www.lynnwatersewer.org/237/Combined-Sewer-Overflows-CSOs for more information on whether specific resource areas, such as bathing or beaches, are affected. The website also includes a real time interactive map that provides the status for each CSO.  

CSO Notification Summary
Permittee Issuing Notification: Lynn Water & Sewer Commission
For more information regarding:
• Approximate Duration of Discharge
• Estimated Volume of Discharge at Time of Notification
Click here: LWSC CSO Map https://bit.ly/42Hrf6f
 
Affected or Potentially Affected Receiving Waters and Municipalities:
Municipalities: 
• Saugus
• Nahant
• Revere
• MWRA
• Swampscott

Receiving Waters: 
Nahant Bay and King's Beach