| Date of Status Change | Active or Inactive | Primary Source | PWS Type | Population | PWS Name | 
| Current Status 09/24/2025 | A | GW | NTNC | 40 | HERMISTON ADVENTIST SCHOOL | 
| 09/24/2025 | A | GW | NTNC | 28 | HERMISTON ADVENTIST SCHOOL | 
| 08/16/2022 | A | GW | NTNC | 40 | HERMISTON ADVENTIST ACADEMY | 
| 08/15/2022 | A | GW | NTNC | 40 | HERMISTON JUNIOR ACADEMY | 
| 11/24/2020 | A | GW | NTNC | 65 | HERMISTON JUNIOR ACADEMY | 
| Population Type | Avg Daily Population | Start Month | Start Day | End Month | End Day | Effective Begin Date | Effective End Date | 
| Non-transient | 40 | 9 | 1 | 6 | 10 | 09/24/2025 | |
| Non-transient | 40 | 1 | 1 | 12 | 31 | 08/21/2025 | 09/23/2025 | 
| Non-transient | 40 | 9 | 1 | 6 | 10 | 08/25/2020 | 08/20/2025 | 
| Non-transient | 65 | 9 | 1 | 6 | 10 | 08/04/1999 | 08/24/2020 |