Environmental Protection Agency officials will host a seminar in Salt Lake City June 1 for industries that handle toxic chemicals.

Some businesses are now required to report each year the amount of chemicals their facilities release into the environment, either routinely or accidentally. The first annual report, covering 1987, is due by July 1.The seminar, scheduled from 8 a.m. to 5 p.m. in the State Office Building auditorium behind the Capitol, will teach company officials what they must do to comply with new federal reporting requirements.

Companies covered by the regulation include manufacturers of textiles, clothing, fabricated metals, leather, paper, food and feed, and furniture. Also covered are printers, petroleum refiners and metal-plating operations.

They must file the reports if they have 10 or more full-time employees, or if the number of hours worked by all employees is greater than 20,000 hours and they meet certain other criteria.

These other criteria are met if they manufacture or use any of more than 300 chemicals on a federal list above specified threshold amounts. The threshold amount for chemical use in manufacturing, importing or processing in 1987 is 75,000 pounds; in 1988, 50,000 pounds; and in 1989 and afterward, 25,000 pounds.

The threshold amount for using a chemical at the facility but not incorporating it into a manufactured product is 10,000 pounds a year.

The law is intended to give the public information about toxic-chemical releases. "For the first time, we will have the big picture," said Irv Dickstein, chief of the Air and Toxics Division in the EPA's Denver regional office.

For more information about the regulations, call Dianne Groh or Gene Johnston, toll free, at (800) 525-3022. Those who want to attend the seminar should call the same number to register.