Wash. Admin. Code § 16-302-335
(1) Field tolerances for the production of foundation, registered or certified grass seed are as follows:
Maximum other varieties permitted in fields producing:
| Foundation: | 0% |
| Registered: | 0.5% |
| Certified: | 2% |
[Statutory Authority: RCW 15.49.005, 15.49.081, 15.49.310, 15.49.370(3) and chapter 17.24 RCW. WSR 00-24-077, § 16-302-335, filed 12/4/00, effective 1/4/01.]