| Date of Status Change |
Record Sequence |
Active or Inactive |
Primary Source |
PWS Type |
Population | PWS Name |
| Current Status 09/02/2025 | 7 | A | GW | NTNC | 65 | COLUMBIA RIVER NITROGEN, LLC |
| 09/02/2025 | 6 | A | GW | NTNC | 65 | DYNO NOBEL INC |
| 07/20/2022 | 5 | A | GW | NTNC | 65 | DYNO NOBEL INC |
| 02/28/2013 | 4 | A | GW | NTNC | 54 | DYNO NOBEL INC |
| 03/02/2006 | 3 | A | GW | NTNC | 75 | DYNO NOBEL INC |
| 03/12/2004 | 2 | A | GW | NTNC | 75 | COASTAL ST HELENS CHEMICAL |
| 04/22/2003 | 1 | A | GW | NTNC | 75 | COASTAL ST. HELENS CHEMICAL |
| Population Type |
Avg Daily Population |
Start Month |
Start Day |
End Month |
End Day |
Effective Begin Date |
Effective End Date |
| Non-transient | 65 | 1 | 1 | 12 | 31 | 10/06/2012 | |
| Non-transient | 54 | 1 | 1 | 12 | 31 | 01/05/2006 | 10/05/2012 |
| Non-transient | 75 | 1 | 1 | 12 | 31 | First Record | 01/04/2006 |