A filtration pool at the Yellow Springs Wastewater Treatment Plant on Grinnell Road. The company that runs a biodigester in Greene County has stopped accepting human waste. That means local municipalities need to find other ways to dispose of the sludge that comes out of their wastewater treatment plants. Nearby residents have complained of the smell and potential health and environmental hazards from Renergy's Fairborn operation for some time, including at a protest last year at the Bath Township Trustee Building. Some residents even filed a lawsuit last month against the company and the property owner, Tom Pitstick, who leases his land for the operation. Furthermore, since Pitstick is a Bath Township Trustee, which is where the biodigester operation is located, residents have also raised concerns about transparency. In December, the Ohio Ethics Commission issued a subpoena for Bath Township records regarding Pitstick and Renergy.