About 800 Maryland employers were cited last year for failing to list the types and locations of all hazardous chemicals they use, and still more remain in violation of a year-old law, state officials said.

"I think pretty soon we'll have to use more muscle," said Ray Lloyd, assistant commissioner for labor and industry. "It was a complex law that applies to such a broad range of work places, we decided to give them a break the first time around."

Under the employes' right-to-know law, employers that had any hazardous chemicals were required to list them, along with all safety data, by Dec. 31, 1984. The law was aimed at giving workers access to information about potential job risks and making state health officials more aware of what chemical hazards exist in Maryland.

Last week, the same list employers were to have drawn up by the end of 1984 was to be made available to the public under a community right-to-know law passed by the 1985 General Assembly.

Dr. Max Eisenberg, director of science and environmental health for the state, said his department has received the required lists from about 1,500 employers.

"But that number is nowhere near all who should submit lists," said Eisenberg.