Mahopac's "Dirtman" will spend four months in jail after he was convicted Thursday of operating illegal landfills that polluted the area's largest drinking water reservoir, state Attorney General Eric Schneiderman said.

Anthony Adolfini, owner of Dirtman Enterprises, was indicted on several felony charges in late April and accused of running a pair of illegal landfills on residential property near the Croton Falls Reservoir.

Adolfini, 52, dumped construction and demolition waste in the watershed area from early 2010 through late 2011, according to prosecutors.

The dumped waste included coal ash and slag, according to an analysis by the state Department of Environmental Conservation. As the debris eroded, pollutants and potential carcinogens seeped into the reservoir, which supplies drinking water to New York City and much of the Hudson Valley.

"Jeopardizing New Yorkers' drinking water by dumping contaminated waste into illegal landfills is deplorable. There is no excuse for this kind of misconduct, and this individual is going to jail for committing these crimes," Schneiderman wrote in a statement Thursday.

Running the illegal landfills in Putnam County was profitable, prosecutors said -- Adolfini made more than $300,000 in less than two years, with as many as 15 truckloads to the sites each day.

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Adolfini pleaded guilty before State Supreme Court Justice Robert A. Neary to operating a solid waste management facility without a permit. In exchange for his plea, Adolfini will serve four months in jail and will be monitored for five years on probation. He also will pay a $7,500 fine, Schneiderman's office said.

The conclusion of the criminal case isn't the end of Adolfini's legal troubles -- he's also the defendant in a civil suit filed by the attorney general. In that case, a preliminary injunction prohibits Adolfini from depositing waste in the Croton Falls Reservoir watershed area, and the prosecutor seeks damages that include civil penalties and an order to clean the debris and "remediate the site."