Officials in multiple cities across the United States in recent months have warned citizens about scams targeting water systems that involve payments to improve so-called quality issues and provide adequate testing. … A similar situation happened in February in Fairfield, California, where a female homeowner said that a strange man and woman showed up on her porch requesting to come into her home. “He says, ‘What we’re doing in the neighborhood is we’re checking the 94533 ZIP codes, which your water is contaminated.’ I said, ‘What do you mean, contaminated?’” Fairfield resident Martha Andrade told local NBC affiliate KCRA. … In December, residents of Santa Maria, California, reported to local officials that scam artists were in their neighborhoods selling water treatment units—telling homeowners that the costs associated with the units would be reimbursed by the city, according to local NBC affiliate KSBY.