| Chemical Sampling Schedule Status | |||||||||||
| Facility ID |
Analyte or Group | Sampling Interval |
Monitoring Period | Days Until End |
Samples Required |
Samples Received |
Last Sample Date |
||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Start | End | ||||||||||
| DIST-A DISTRIBUTION SYSTEM | LEAD & COPPER | notes | 3 Years | 01/01/2027 - 12/31/2027 | 5 | 09/18/2024 | |||||
| Seasonal sampling period: 06/01 thru 09/30 | |||||||||||
| DIST-A DISTRIBUTION SYSTEM | STAGE 2 DBP | Quarterly | 04/01/2026 - 06/30/2026 | 62 | 1 | incomplete | 03/04/2026 | ||||
| EP-A EP FOR COLUMBIA RIVER | ARSENIC | notes | 9 Years | 01/01/2020 - 12/31/2028 | 977 | 1 | incomplete | 10/09/2019 | |||
| EP-A EP FOR COLUMBIA RIVER | IOC | notes | 9 Years | 01/01/2020 - 12/31/2028 | 977 | 1 | incomplete | 10/09/2019 | |||
| EP-A EP FOR COLUMBIA RIVER | NITRATE | Yearly | 01/01/2026 - 12/31/2026 | 246 | 1 | incomplete | 02/26/2025 | ||||
| EP-A EP FOR COLUMBIA RIVER | NITRITE | notes | 9 Years | 01/01/2020 - 12/31/2028 | 977 | 1 | incomplete | 10/09/2019 | |||
| EP-A EP FOR COLUMBIA RIVER | PFAS | notes | Quarterly | 04/01/2026 - 06/30/2026 | 62 | 1 | incomplete | 11/24/2025 | |||
| Initial monitoring - 4 quarters only | |||||||||||
| EP-A EP FOR COLUMBIA RIVER | SOC | 3 Years | 01/01/2026 - 12/31/2028 | 977 | 1 | incomplete | 12/03/2025 | ||||
| EP-A EP FOR COLUMBIA RIVER | VOLATILE ORGANICS | notes | Yearly | 01/01/2026 - 12/31/2026 | 246 | 1 | done | 03/04/2026 | |||
| SRC-AA COLUMBIA RIVER | CYANOTOXINS | 2 Weeks | 04/19/2026 - 05/02/2026 | 3 | 1 | incomplete | |||||
| Seasonal sampling period: 05/01 thru 10/31 | |||||||||||
4 secs | |||||||||||
| Expired Schedules | |||||||||
| Facility ID |
Analyte or Group | Sampling Interval |
Start | End | Samples Required |
Notes | |||
| DIST-A DISTRIBUTION SYSTEM | HAA5 & TTHM | Yearly | 01/01/2004 | 12/31/2014 | 1 | Sample between June 1 and Sept. 30. | |||
| DIST-A DISTRIBUTION SYSTEM | STAGE 2 DBP | Yearly | 01/01/2015 | 12/31/2019 | 1 | Sample in July beginning in 2015 | |||
| EP-A EP FOR COLUMBIA RIVER | ARSENIC | Yearly | 01/01/2002 | 12/31/2010 | 1 | ||||
| EP-A EP FOR COLUMBIA RIVER | ETHYLBENZENE | Quarterly | 10/01/2019 | 12/31/2025 | 1 | ||||
| EP-A EP FOR COLUMBIA RIVER | VOLATILE ORGANICS | Yearly | 01/01/2002 | 12/31/2025 | 1 | ||||
| EP-A EP FOR COLUMBIA RIVER | XYLENES, TOTAL | Quarterly | 10/01/2019 | 12/31/2025 | 1 | ||||
| SRC-AA COLUMBIA RIVER | CYANOTOXINS | WK | 07/30/2023 | 09/15/2023 | 1 | ||||