Mark Joslin retired from Columbus City Utilities on 12/13/2022 after 43 years of service. He began working at our Wastewater Treatment Plant in 1979 and held the same position during his 43 years of service, which made him the local expert in Wastewater Treatment Operations. It is estimated he has collected over 90,000 wastewater samples and conducted over 45,000 rounds performing equipment checks during his years of employment. Mark has participated and held memberships in several environmental organizations at the state and local level. His co-workers held a small celebration for him on his last day and Mary Ferdon, presented him with a proclamation on behalf of Mayor Lienhoop.