The City of Winnebago was fined $12,700 for exceeding discharge levels from its wastewater treatment plant and for failing to regulate pollutants from a local business, according to the Minnesota Pollution Control Agency. By allowing high-strength polluted wastewater from the business, Continental Carbonics, to pass through the plant and disrupt the treatment process, the city failed to enforce its wastewater agreement with the company, the agency said. The plant sends treated water into the Blue Earth River. When wastewater was tested in January 2010, it was found to lack sufficient oxygen for decomposition of organic matter. The city has paid the fine and agreed to upgrade equipment and write a new operations manual. Read the agreement between the MPCA and the city here.