WANTAGH - Critics are slamming a recent mailer sent out by County Executive Ed Mangano (R-Nassau) about his plan to privatize the county's sewage treatment plants. The letter is titled a "community update," but critics say it's not informative at all and it merely takes shots at his opponents. At 90 cents in postage per letter, opponents say they're also wondering if taxpayers foot the bill for the mailers. Democratic lawmakers say Mangano has used this tactic in the past at taxpayers' expense. They say he has previously sent letters criticizing his opponents or touting his proposals, and has even used the county's automated emergency alert system to promote his plan to downgrade the county's police precincts.Legislator Dave Denenberg (D-Merrick) says if taxpayers are paying for the promotions, the executive's office should at least detail the pros and cons of the plans it sends mailers on.In a statement, the county executive's office says, "Mangano will not be intimidated or silenced by Legislator Denenberg. All must know the state of Nassau's sewage plants and the plan to fix them."