Missouri American Water Announces $3 Million Water Main Upgrade in South St. Louis County

ST. LOUIS, MO (March 7, 2022) – Missouri American Water today announced the start of a $3 million project to replace more than 6,200 feet of water main in St. Louis County along Mattis Road between Tesson Ferry Road and Lemay Ferry Road to improve reliability for customers and reduce service disruptions.

The water utility is working in conjunction with St. Louis County to minimize disruptions to the area. Crews will begin installing new eight-inch PVC water main to replace the aging eight-inch cast iron main that was originally installed in the 1940s.  

“We’re excited to improve water service and keep life flowing to our customers in South St. Louis County by replacing old water mains that are reaching the end of their useful life,” said Rebecca Losli, Director of Engineering. “Customers will see an uptick in our crews and contractors working around St. Louis County this spring and summer as more pipe replacement projects get underway.”  

Crews will break ground on Mattis Road the week of March 14. Work will take place Monday - Friday from 7 a.m. - 4 p.m. until October in three phases: 

  • Phase one: Between Langtree Drive and Venarde Drive, crews will replace 2,040 feet of main.
  • Phase two: Between Venarde Drive and Ambs Road, crews will replace 2,035 feet of main.
  • Phase three: Between Ambs Road and Tonga Drive, crews will replace 2,280 feet of main.


Service line transfers and street restoration are expected to be completed by the end of 2022. 

To view a map of pipe replacement projects in St. Louis County, visit Missouri American Water’s new interactive map

Motorists should use caution when driving in the construction areas and obey traffic signs, detour routes and flaggers. Missouri American Water will provide continuous updates as work occurs. Customers may receive updates via door hangers and/or the company’s notification system that contacts customers via phone, text or email based on customer preferences. Visit for emergency alerts and create or update a MyWater account to sign up for notifications. 

Missouri American Water, a subsidiary of American Water (NYSE: AWK), is the largest investor-owned water utility in the state, providing high-quality and reliable water and wastewater services to approximately 1.5 million people. For more information, visit and follow Missouri American Water on Twitter, Instagram and Facebook.

About American Water

With a history dating back to 1886, American Water (NYSE:AWK) is the largest and most geographically diverse U.S. publicly traded water and wastewater utility company. The company employs more than 6,400 dedicated professionals who provide regulated and regulated-like drinking water and wastewater services to more than 14 million people in 24 states. American Water provides safe, clean, affordable and reliable water services to our customers to help keep their lives flowing. For more information, visit and follow American Water on Twitter, Facebook, and LinkedIn.

Media Contacts

Samantha Williams

Manager, External Affairs