Collecting household hazardous wastes is more complicated than collecting newspapers and bottles. Expertise is required. Governments hire private companies that specialize in classifying and safely disposing of household hazardous waste. Some of the materials, for instance, are incinerated at private facilities. That costs money. Howard County spends about $450,000 a year to dispose of household hazardous waste. Anne Arundel County, according its website, spent close to $205,000, and Baltimore City officials estimate it cost about $100,000 for Saturday's one day effort.