Dayton, WA · Columbia County
DAYTON WATER DEPARTMENT Water System
Current status
No open violations on record as of July 4, 2026.
This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Washington’s official records. Always confirm current status with Washington before making decisions based on this information.
System facts
- System ID (PWSID)
- WA5318250
- System type
- Community Water System
- Population served
- 3,374
- Service connections
- 1,483
- Ownership
- local government
- Water source
- groundwater (wells)
Violation history
Monitoring, Regular
—Nitrate
January 1, 2025 – December 31, 2025
ArchivedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2018 – September 11, 2018
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2015 – August 21, 2015
ResolvedMaximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
July 1, 1998 – July 31, 1998
ArchivedMaximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
October 1, 1997 – October 31, 1997
ArchivedMaximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
November 1, 1996 – November 30, 1996
ArchivedMaximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
September 1, 1996 – September 30, 1996
ArchivedMonitoring, Routine Major (TCR)
—Coliform (TCR)
March 1, 1994 – March 31, 1994
ArchivedMonitoring, Routine Major (TCR)
—Coliform (TCR)
January 1, 1994 – January 31, 1994
ArchivedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
October 1, 1991 – October 31, 1991
ArchivedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
October 1, 1979 – October 31, 1979
Archived
Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| January 1, 2025 – December 31, 2025 | Monitoring, Regular | Nitrate | — | Archived |
| July 1, 2018 – September 11, 2018 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
| July 1, 2015 – August 21, 2015 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
| July 1, 1998 – July 31, 1998 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Archived |
| October 1, 1997 – October 31, 1997 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Archived |
| November 1, 1996 – November 30, 1996 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Archived |
| September 1, 1996 – September 30, 1996 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Archived |
| March 1, 1994 – March 31, 1994 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Archived |
| January 1, 1994 – January 31, 1994 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Archived |
| October 1, 1991 – October 31, 1991 | Monitoring, Routine Minor (TCR) | Coliform (TCR) | — | Archived |
| October 1, 1979 – October 31, 1979 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state
Enforcement actions
- September 11, 2018State Compliance achieved1 linked violation
- October 26, 2016State Compliance achieved1 linked violation
- August 21, 2015State Compliance achieved1 linked violation
- August 30, 2003Federal Compliance achieved1 linked violation
- October 31, 1997State Violation/Reminder Notice7 linked violations
- January 31, 1994State Violation/Reminder Notice1 linked violation
Contact
DAYTON WATER DEPARTMENT
Phone not on record
Dayton, WA 99328