| System Information | Schedule Counts |
Status: Active System Type: Community Population Served: 400,000 | Active: 14 Show Only Active Inactive: 0 Expired: 11 |
| Routine Sampling Schedules For Chemicals | ||||||||
| Facility ID |
Name | Status | Test Group | Samples Required |
Sampling Interval |
Start | End | Notes |
| CH-A | COMMON HEADER FOR WTP-A | A | TOC & ALKALINITY | 1 | Quarterly | 01/01/2006 | Open | Raw TOC and alkalinity |
| DIST-A | DISTRIBUTION SYSTEM | A | STAGE 2 DBP | 1 | Yearly | 01/01/2012 | Open | Collect sample in July |
| EP-A | EP FOR TUALATIN RIVER | A | ARSENIC | 1 | 9 Years | 01/01/2011 | Open | Schedule Reflects Monitoring Reduction Granted |
| EP-A | EP FOR TUALATIN RIVER | A | HEXACHLOROCYCLOPENTADIENE | 1 | Quarterly | 01/01/2026 | Open | |
| EP-A | EP FOR TUALATIN RIVER | A | IOC | 1 | 9 Years | 01/01/2002 | Open | Schedule Reflects Monitoring Reduction Granted |
| EP-A | EP FOR TUALATIN RIVER | A | NITRATE | 1 | Yearly | 01/01/2002 | Open | |
| EP-A | EP FOR TUALATIN RIVER | A | NITRITE | 1 | 9 Years | 01/01/2002 | Open | Schedule Reflects Monitoring Reduction Granted |
| EP-A | EP FOR TUALATIN RIVER | A | RAD - GROSS ALPHA | 1 | 9 Years | 01/01/2008 | Open | Schedule Reflects Monitoring Reduction Granted |
| EP-A | EP FOR TUALATIN RIVER | A | RAD - RADIUM 226/228 | 1 | 9 Years | 01/01/2014 | Open | |
| EP-A | EP FOR TUALATIN RIVER | A | RAD - URANIUM | 1 | 9 Years | 01/01/2008 | Open | Schedule Reflects Monitoring Reduction Granted |
| EP-A | EP FOR TUALATIN RIVER | A | SOC | 2 | 3 Years | 01/01/2002 | Open | 2 Consec. QT Samples |
| EP-A | EP FOR TUALATIN RIVER | A | VOLATILE ORGANICS | 1 | Yearly | 01/01/2002 | Open | |
| SRC-AA | TUALATIN RIVER | A | CYANOTOXINS | 1 | 2 Weeks | 07/15/2018 | Open | |
| WTP-A | TP FOR TUALATIN RIVER | A | TOTAL ORGANIC CARBON | 1 | Monthly | 02/01/2020 | Open | Sample filters 15 & 16 monthly - sample filters 1-14 quarterly |
| Expired Schedules | ||||||||
| CH-A | COMMON HEADER FOR WTP-A | A | TOC & ALKALINITY | 1 | Monthly | 01/01/2002 | 12/31/2005 | Raw and filtered TOC and alkalinity |
| DIST-A | DISTRIBUTION SYSTEM | A | HAA5 & TTHM | 4 | Quarterly | 01/01/2002 | 06/30/2008 | Reflects 4 RT Samples Per QT Per WTP |
| EP-A | EP FOR TUALATIN RIVER | A | ARSENIC | 1 | Yearly | 01/01/2002 | 12/31/2010 | |
| EP-A | EP FOR TUALATIN RIVER | A | HEXACHLOROCYCLOPENTADIENE | 1 | Quarterly | 01/01/2019 | 12/31/2019 | |
| EP-A | EP FOR TUALATIN RIVER | A | HEXACHLOROCYCLOPENTADIENE | 1 | Quarterly | 01/01/2022 | 12/31/2022 | |
| EP-A | EP FOR TUALATIN RIVER | A | HEXACHLOROCYCLOPENTADIENE | 1 | Yearly | 01/01/2020 | 12/31/2021 | Collect sample between October 1 and December 31. |
| EP-A | EP FOR TUALATIN RIVER | A | HEXACHLOROCYCLOPENTADIENE | 1 | Yearly | 01/01/2023 | 12/31/2025 | Sample in 4th quarter Oct - Dec |
| EP-A | EP FOR TUALATIN RIVER | A | PFAS | 1 | Quarterly | 01/01/2023 | 12/31/2025 | |
| EP-A | EP FOR TUALATIN RIVER | A | RAD - RADIUM 226/228 | 1 | 6 Years | 01/01/2008 | 12/31/2013 | |
| WTP-A | TP FOR TUALATIN RIVER | A | TOTAL ORGANIC CARBON | 1 | Monthly | 01/01/2002 | 12/31/2005 | Post Filtration TOC |
| WTP-A | TP FOR TUALATIN RIVER | A | TOTAL ORGANIC CARBON | 1 | Quarterly | 01/01/2006 | 12/31/2019 | Post Filtration TOC |