| Kingshighway Office | | | Chain of Rocks Plant |
| 1640 S. Kingshighway Blvd | | | 10450 Riverview Dr |
| St. Louis, MO 63110 | | | St. Louis, MO 63137 |
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| Administration | | | Supply & Purifying |
| Phone: | (314) 633-9013 | | Phone: | (314) 592-8201 |
| Fax Number: | (314) 664-6786 | | Fax Number: | (314) 868-3197 |
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| Data Processing | | | Plant Engineering |
| Phone: | (314) 633-9067 | | Phone: | (314) 592-8211 |
| Fax Number: | (314) 633-9086 | | Fax Number: | (314) 868-3197 |
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| Human Resources | | | Process Control |
| Phone: | (314) 633-9094 | | Phone: | (314) 592-8212 |
| Fax Number: | (314) 664-6786 | | Fax Number: | (314) 868-3197 |
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| Finance | | | Power & Pumping |
| Phone: | (314) 633-9008 | | Phone: | (314) 592-8244 |
| Fax Number: | (314) 771-8762 | | Fax Number: | (314) 868-0341 |
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| Customer Service | | | Construction & Maintenance |
| Phone: | (314) 771-2255 | | Phone: | (314) 592-8280 |
| Fax Number: | (314) 771-8762 | | Fax Number: | (314) 869-6504 |
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| Network & Communications | |
| Phone: | (314) 633-9042 |
| Fax Number: | (314) 664-6786 |
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| McRee Office | | | Howard Bend Plant |
| 4600 McRee Ave | | | 14769 Olive Blvd |
| St. Louis, MO 63110 | | | Chesterfield, MO 63017 |
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| Service Delivery | | | Supply & Purifying |
| Phone: | (314) 633-9021 | | Phone: | (314) 469-1900 |
| Fax Number: | (314) 664-4074 | | Fax Number: | (314) 469-1702 |
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| Distribution System Engineering | | | Power & Pumping |
| Phone: | (314) 633-9023 | | Phone: | (314) 469-1900 |
| Fax Number: | (314) 664-4074 | | Fax Number: | (314) 469-1702 |
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