Wash. Admin. Code § 16-302-240
(3) Seed standards for the production of alfalfa seed are as follows:
| Purity | Foundation | Registered | Certified |
| Pure seed (minimum) | 99.00% | 99.00% | 99.00% |
| Other crop (maximum) | 0.10% | 0.10% | 0.25% |
| Sweet clover (maximum) | None found | None found | 90 per lb. |
| Inert matter (maximum) | 1.00% | 1.00% | 1.00% |
| Weed seed (maximum) | 0.10% | 0.20% | 0.25% |
| Brassica species | None found | — | — |
| Prohibited weeds | None found | None found | None found |
| Objectionable weed (maximum) | None found | None found | 18 per lb. |
| Germination (minimum total germ and hard seed) | 80.00% | 85.00% | 85.00% |
| or TZ, Tetrazolium Test (minimum total of TZ and hard seed) | 82.00% | 87.00% | 87.00% |
[Statutory Authority: RCW 15.49.005, [15.49].021, [15.49].310, [15.49].370, 15.140.030, and chapter 15.49 RCW. WSR 25-09-035, s 16-302-240, filed 4/9/25, effective 5/10/25. Statutory Authority: RCW 15.49.005, 15.49.310, 15.49.370(3), chapters 17.24 and 34.05 RCW. WSR 17-13-130, § 16-302-240, filed 6/21/17, effective 7/22/17. 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, § 16-302-240, filed 12/4/00, effective 1/4/01.]