Wage grade environmental differential pay (EDP)

Environmental differential pay is for wage grade employees the counterpart to hazardous duty pay for general schedule employees. Differentials are paid according to schedules that vary the payment amounts according to the risk involved in the job or the degree of exposure to a hazard.

Human resources offices determine the local situation for which EDP is payable and obtain approval from OPM for additional categories. EDP is included as part of an wage grade employee’s basic rate of pay for computation of overtime, holiday pay, Sunday premium, and the amount of retirement, Thrift Savings Plan, and life insurance deductions. It is not part of basic pay for purposes of lump-sum leave payments and severance pay.


If a wage system employee receiving environmental differential pay moves to a GS position that involves the performance of the same duty that prompted the payment of EDP, he or she may receive hazardous duty pay, as long as the requirements for that type of pay are met.

Under 5 U.S.C. 5343(c)(4) any entitlement determination for prevailing rate employees concerning exposure to asbestos must be consistent with permissible exposure limits set by the Occupational Safety and Health Administration. Implementing rules are at 5 CFR 532.