Effective November 19, 2010.
| Risk Classification | Hazard Group |
| 101 | 9 |
| 103 | 8 |
| 104 | 8 |
| 105 | 5 |
| 107 | 9 |
| 108 | 8 |
| 112 | 7 |
| 201 | 9 |
| 202 | 9 |
| 210 | 8 |
| 212 | 9 |
| 214 | 8 |
| 217 | 7 |
| 219 | 7 |
| 301 | 4 |
| 302 | 9 |
| 303 | 9 |
| 306 | 8 |
| 307 | 7 |
| 308 | 3 |
| 403 | 6 |
| 502 | 8 |
| 504 | 9 |
| 507 | 8 |
| 508 | 9 |
| 509 | 9 |
| 510 | 7 |
| 511 | 7 |
| 512 | 9 |
| 513 | 6 |
| 514 | 7 |
| 516 | 8 |
| 517 | 9 |
| 518 | 9 |
| 519 | 9 |
| 521 | 7 |
| 540 | 8 |
| 541 | 9 |
| 550 | 9 |
| 551 | 9 |
| 601 | 7 |
| 602 | 7 |
| 603 | 9 |
| 604 | 7 |
| 606 | 4 |
| 607 | 6 |
| 608 | 7 |
| 701 | 9 |
| 803 | 5 |
| 901 | 8 |
| 1002 | 8 |
| 1003 | 7 |
| 1004 | 6 |
| 1005 | 8 |
| 1007 | 7 |
| 1101 | 5 |
| 1102 | 8 |
| 1103 | 8 |
| 1104 | 3 |
| 1105 | 7 |
| 1106 | 5 |
| 1108 | 5 |
| 1109 | 6 |
| 1301 | 2 |
| 1303 | 3 |
| 1304 | 5 |
| 1305 | 4 |
| 1401 | 9 |
| 1404 | 3 |
| 1405 | 1 |
| 1407 | 4 |
| 1501 | 5 |
| 1507 | 5 |
| 1701 | 7 |
| 1702 | 9 |
| 1703 | 9 |
| 1704 | 7 |
| 1801 | 9 |
| 1802 | 5 |
| 2002 | 6 |
| 2004 | 4 |
| 2007 | 6 |
| 2008 | 6 |
| 2009 | 3 |
| 2101 | 5 |
| 2102 | 3 |
| 2104 | 2 |
| 2105 | 2 |
| 2106 | 4 |
| 2201 | 6 |
| 2202 | 5 |
| 2203 | 2 |
| 2204 | 6 |
| 2401 | 1 |
| 2903 | 4 |
| 2904 | 6 |
| 2905 | 3 |
| 2906 | 4 |
| 2907 | 3 |
| 2908 | 7 |
| 2909 | 4 |
| 3101 | 6 |
| 3102 | 6 |
| 3103 | 6 |
| 3104 | 6 |
| 3105 | 5 |
| 3303 | 3 |
| 3304 | 3 |
| 3309 | 6 |
| 3402 | 6 |
| 3403 | 6 |
| 3404 | 5 |
| 3405 | 3 |
| 3406 | 1 |
| 3407 | 6 |
| 3408 | 1 |
| 3409 | 1 |
| 3410 | 2 |
| 3411 | 6 |
| 3412 | 8 |
| 3414 | 6 |
| 3415 | 9 |
| 3501 | 6 |
| 3503 | 3 |
| 3506 | 7 |
| 3509 | 1 |
| 3510 | 2 |
| 3511 | 6 |
| 3512 | 3 |
| 3513 | 8 |
| 3602 | 4 |
| 3603 | 4 |
| 3604 | 7 |
| 3605 | 5 |
| 3701 | 5 |
| 3702 | 3 |
| 3708 | 5 |
| 3802 | 3 |
| 3808 | 7 |
| 3901 | 1 |
| 3902 | 4 |
| 3903 | 6 |
| 3905 | 1 |
| 3906 | 4 |
| 3909 | 3 |
| 4002 | 7 |
| 4101 | 5 |
| 4103 | 2 |
| 4107 | 6 |
| 4108 | 3 |
| 4109 | 6 |
| 4201 | 6 |
| 4301 | 4 |
| 4302 | 4 |
| 4304 | 6 |
| 4305 | 5 |
| 4401 | 6 |
| 4402 | 2 |
| 4404 | 5 |
| 4501 | 1 |
| 4502 | 5 |
| 4504 | 1 |
| 4601 | 5 |
| 4802 | 7 |
| 4803 | 2 |
| 4804 | 2 |
| 4805 | 2 |
| 4806 | 5 |
| 4808 | 6 |
| 4809 | 3 |
| 4810 | 3 |
| 4811 | 3 |
| 4812 | 2 |
| 4813 | 3 |
| 4900 | 9 |
| 4901 | 6 |
| 4902 | 3 |
| 4903 | 1 |
| 4904 | 3 |
| 4905 | 2 |
| 4906 | 2 |
| 4907 | 4 |
| 4908 | 2 |
| 4909 | 3 |
| 4910 | 6 |
| 4911 | 6 |
| 5001 | 9 |
| 5002 | 3 |
| 5003 | 9 |
| 5004 | 8 |
| 5005 | 9 |
| 5006 | 9 |
| 5101 | 4 |
| 5103 | 3 |
| 5106 | 2 |
| 5108 | 3 |
| 5109 | 6 |
| 5201 | 4 |
| 5204 | 8 |
| 5206 | 6 |
| 5207 | 2 |
| 5208 | 4 |
| 5209 | 6 |
| 5300 | 2 |
| 5301 | 3 |
| 5302 | 5 |
| 5305 | 1 |
| 5306 | 1 |
| 5307 | 4 |
| 5308 | 1 |
| 6103 | 1 |
| 6104 | 2 |
| 6105 | 6 |
| 6107 | 1 |
| 6108 | 1 |
| 6109 | 4 |
| 6110 | 5 |
| 6120 | 5 |
| 6121 | 5 |
| 6201 | 7 |
| 6202 | 6 |
| 6203 | 1 |
| 6204 | 2 |
| 6205 | 4 |
| 6206 | 3 |
| 6207 | 6 |
| 6208 | 2 |
| 6209 | 3 |
| 6301 | 8 |
| 6303 | 5 |
| 6304 | 1 |
| 6305 | 1 |
| 6306 | 4 |
| 6308 | 2 |
| 6309 | 3 |
| 6402 | 1 |
| 6403 | 1 |
| 6404 | 3 |
| 6405 | 5 |
| 6406 | 1 |
| 6407 | 3 |
| 6408 | 4 |
| 6409 | 6 |
| 6410 | 3 |
| 6501 | 1 |
| 6502 | 4 |
| 6503 | 5 |
| 6504 | 1 |
| 6505 | 1 |
| 6506 | 2 |
| 6509 | 2 |
| 6510 | 8 |
| 6511 | 3 |
| 6512 | 6 |
| 6601 | 4 |
| 6602 | 5 |
| 6603 | 4 |
| 6604 | 1 |
| 6605 | 1 |
| 6607 | 4 |
| 6608 | 9 |
| 6620 | 1 |
| 6704 | 2 |
| 6705 | 2 |
| 6706 | 6 |
| 6707 | 1 |
| 6708 | 8 |
| 6709 | 2 |
| 6801 | 3 |
| 6802 | 2 |
| 6803 | 9 |
| 6804 | 3 |
| 6809 | 2 |
| 6901 | 1 |
| 6902 | 9 |
| 6903 | 9 |
| 6904 | 1 |
| 6905 | 1 |
| 6906 | 1 |
| 6907 | 4 |
| 6908 | 4 |
| 6909 | 2 |
| 7100 | 7 |
| 7101 | 8 |
| 7102 | 3 |
| 7103 | 4 |
| 7104 | 3 |
| 7105 | 3 |
| 7106 | 3 |
| 7107 | 2 |
| 7108 | 4 |
| 7109 | 4 |
| 7110 | 5 |
| 7111 | 4 |
| 7112 | 4 |
| 7113 | 3 |
| 7114 | 3 |
| 7115 | 3 |
| 7116 | 8 |
| 7117 | 3 |
| 7118 | 7 |
| 7119 | 6 |
| 7120 | 9 |
| 7121 | 9 |
| 7122 | 5 |
| 7200 | 3 |
| 7201 | 5 |
| 7202 | 6 |
| 7203 | 1 |
| 7301 | 6 |
| 7302 | 7 |
| 7307 | 5 |
| 7308 | 1 |
| 7309 | 2 |
| 7400 | 6 |
| The following classes have no hazard group assigned to them |
| 6614 | |
| 6615 | |
| 6616 | |
| 6617 | |
| 6618 | |
| 7204 | |
| 7205 | |
[Statutory Authority: RCW 51.16.035, 51.16.100, 51.04.020(1), and 51.18.010. 10-21-086, ยง 296-17-901, filed 10/19/10, effective 11/19/10.]