Press Release

FOR IMMEDIATE RELEASE -- January 12, 2022
Kevin Kelly (573) 751-9300

PSC Approves Missouri American-Water Company Request
to Establish a WSIRA Rate

JEFFERSON CITY---The Missouri Public Service Commission has approved a request filed by the Missouri-American Water Company to establish a Water and Sewer Infrastructure Rate Adjustment (WSIRA) on customer bills.

State statutes provide eligible water and sewer corporations with the ability to recover certain eligible infrastructure system replacement costs without the need to file a formal rate case with the Public Service Commission. These investments in infrastructure are recovered through a WSIRA. The WSIRA proposed by Missouri-American Water Company in this case reflects eligible investment
placed in service from January 1, 2021 through October 31, 2021. These costs are not currently
reflected in customer bills.

For water residential customers using 5,000 gallons of water per month, St. Louis County customers would see a monthly WSIRA of $2.41. For water customers outside of St. Louis County, the monthly WSIRA would be $1.28. For residential sewer customers, the WSIRA will be based on a percentage of the total monthly sewer bill--0.6773% for Arnold customers of Missouri-American Water Company and 2.5882% for Missouri-American Water Company customers outside of Arnold.

The WSIRA will appear as a separate item on customer bills and is expected to take effect in March 2022. The WSIRA process is a replacement for the Infrastructure System Replacement Surcharge (ISRS) mechanism used by Missouri-American Water Company to recover certain infrastructure investments outside of a general rate case in past years. When the WSIRA takes effect, the ISRS will
be reset to zero.

MAWC provides water service to approximately 471,000 customers in Missouri. It also provides sewer service to approximately 15,000 customers in the state.
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