The state of Maryland and the federal government have filed separate lawsuits against the District of Columbia Water and Sewer Authority (DC Water), both alleging that the agency’s failure to address longstanding deterioration in the Potomac Interceptor contributed to a weeklong release of more than 240 million gallons of raw sewage into the Potomac River this past January. Maryland’s complaint , filed April 20 in Montgomery County Circuit Court, claims that based on inspections conducted more than a decade earlier, DC Water should have been aware that the collapsed section of the 72-in.-dia pipeline was at high risk of structural failure.  The segment where the rupture occurred had been targeted for repair under DC Water’s $625-million, 10-year rehabilitation program for the 60-year-old pipeline, but other areas along the 54-mile route were addressed first, including a nearby section where work began last year.…