The MWRA system continues to be affected by the heavy rain and its aftermath. The rate of flow receiving treatment at the Deer Island Treatment Plant remains at about 700 million gallons per day. The rate of flow receiving treatment at the Nut Island Treatment Plant remains at about 300 million gallons per day.
Major interceptors continue to be at or above capacity owing to storm water inflow and infiltration.
Interceptor levels have generally been dropping as the rainfall has tapered off, although the system is still far from full recovery. The principal South System interceptor is being badly affected by the extraordinary flooding conditions in the area rivers. MWRA and BWSC continue to use emergency procedures in the Roslindale area to divert flows from the overloaded interceptor into the Stony Brook drainage conduit to provide that relief. In addition to maintaining facility operating status, MWRA sampling crews have begun to assemble testing data on the pollution effects of the storm in the tributary rivers and Boston Harbor. Further information is expected later today.