New standards being proposed by the Environmental Protection Agency and the Missouri Department of Natural Resources could lead to a significant increase in costs for municipally owned sewer treatment plants at the local and statewide levels. Additional costs between over $220,000 and nearly $670,000 could be incurred to add what’s needed to meet the new environmental limits on treated wastewater. In fact, if both public and private facilities are mandated to make the improvements, the cost would double to between $428,000 and over $1.2 million dollars. Those costs could end up ultimately being paid by the public. The new standards require disinfection and new ammonia and dissolved oxygen limits on all treatment plants that discharge into streams which jumped last year from 25,000 to over 115,000 miles of streams under the new classifications by the E.P.A.