1. (1) Distribution boxes must be constructed of concrete, fiberglass, or other materials acceptable to DEQ.
2. (2) Distribution boxes must be constructed of durable, watertight materials resistant to deterioration and be designed to accommodate watertight connections for the effluent sewer and header pipes. The top, walls, and bottom of concrete distribution boxes must be at least 1-1/2 inches thick. All distribution boxes must be able to support an earth load of at least 200 pounds per square foot.
3. (3) The invert elevation of all outlets must be the same and must be at least 2 inches below the inlet invert.
4. (4) Each distribution box must be provided with a sump extending at least 2 inches below the invert of the outlets unless otherwise authorized by DEQ.
5. (5) Distribution box covers must be marked with the manufacturer's full business name or number assigned by DEQ.
6. (6) Each manufacturer must provide DEQ with complete, detailed plans and specifications of the distribution box and must certify, in writing, that distribution boxes manufactured for use in onsite sewage systems in Oregon will comply with all requirements of this rule. Plans and specifications must be prepared under the supervision of and designed by a professional engineer licensed in accordance with ORS chapter 672.

Statutory/Other Authority

ORS 454.625 & 468.020

Statutes/Other Implemented

ORS 454.615

History

DEQ 29-2025, amend filed 10/01/2025, effective 01/01/2026
DEQ 11-2004, f. 12-22-04, cert. ef. 3-1-05
DEQ 27-1994, f. 11-15-94, cert. ef. 4-1-95
DEQ 5-1982, f. & ef. 3-9-82
DEQ 10-1981, f. & ef. 3-20-81