| 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 | ||||||||||
| CH-A COMMON HEADER FOR WTP-A | TOC & ALKALINITY | notes | Quarterly | 04/01/2026 - 06/30/2026 | 55 | 1 | done | 04/01/2026 | |||
| DIST-A DISTRIBUTION SYSTEM | STAGE 2 DBP | notes | Yearly | 01/01/2026 - 12/31/2026 | 239 | 1 | incomplete | 07/09/2025 | |||
| Seasonal sampling period: 07/01 thru 07/31 | |||||||||||
| EP-A EP FOR TUALATIN RIVER | HEXACHLOROCYCLOPENTADIENE | Quarterly | 04/01/2026 - 06/30/2026 | 55 | 1 | done | 04/01/2026 | ||||
| EP-A EP FOR TUALATIN RIVER | ARSENIC | notes | 9 Years | 01/01/2020 - 12/31/2028 | 970 | 1 | done | 04/01/2026 | |||
| EP-A EP FOR TUALATIN RIVER | IOC | notes | 9 Years | 01/01/2020 - 12/31/2028 | 970 | 1 | done | 04/01/2026 | |||
| EP-A EP FOR TUALATIN RIVER | NITRATE | Yearly | 01/01/2026 - 12/31/2026 | 239 | 1 | done | 04/01/2026 | ||||
| EP-A EP FOR TUALATIN RIVER | NITRITE | notes | 9 Years | 01/01/2020 - 12/31/2028 | 970 | 1 | done | 04/01/2026 | |||
| EP-A EP FOR TUALATIN RIVER | RAD - GROSS ALPHA | notes | 9 Years | 01/01/2026 - 12/31/2034 | 3,161 | 1 | incomplete | 04/07/2021 | |||
| EP-A EP FOR TUALATIN RIVER | RAD - RADIUM 226/228 | 9 Years | 01/01/2023 - 12/31/2031 | 2,065 | 1 | incomplete | 04/07/2021 | ||||
| EP-A EP FOR TUALATIN RIVER | RAD - URANIUM | notes | 9 Years | 01/01/2026 - 12/31/2034 | 3,161 | 1 | incomplete | 04/07/2021 | |||
| EP-A EP FOR TUALATIN RIVER | SOC | notes | 3 Years | 01/01/2026 - 12/31/2028 | 970 | 2 | incomplete | 04/01/2026 | |||
| EP-A EP FOR TUALATIN RIVER | VOLATILE ORGANICS | Yearly | 01/01/2026 - 12/31/2026 | 239 | 1 | done | 04/01/2026 | ||||
| SRC-AA TUALATIN RIVER | CYANOTOXINS | 2 Weeks | 05/03/2026 - 05/16/2026 | 10 | 1 | incomplete | |||||
| Seasonal sampling period: 05/01 thru 10/31 | |||||||||||
| WTP-A TP FOR TUALATIN RIVER | TOTAL ORGANIC CARBON | notes | Monthly | 05/01/2026 - 05/31/2026 | 25 | 1 | incomplete | 04/01/2026 | |||
4 secs | |||||||||||