Dayton, WA · Columbia County
DAYTON WATER DEPARTMENT Water System
Consumer Confidence Report status
DAYTON WATER DEPARTMENT must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for DAYTON WATER DEPARTMENT.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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)
DAYTON WATER DEPARTMENT is one of 112 community water systems in Washington in the 3,301 to 10,000 people size category, serving 3,374 people from groundwater.
As of August 1, 2026, its federal record holds 10 entries between 1979 and 2025, all of which EPA lists as closed.
Of the 10, 4 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Total Coliform Rules, the Consumer Confidence Rule, and inorganic chemicals.
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, 2016 – October 26, 2016
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)
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, 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, 2016 – October 26, 2016 | 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 |
| 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, 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
- July 31, 1998State Public Notification requested14 linked violations
- January 31, 1994State Violation/Reminder Notice1 linked violation
Common questions
Is DAYTON WATER DEPARTMENT required to publish a Consumer Confidence Report?
- Yes. DAYTON WATER DEPARTMENT is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is DAYTON WATER DEPARTMENT’s next Consumer Confidence Report due?
- DAYTON WATER DEPARTMENT’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does DAYTON WATER DEPARTMENT have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for DAYTON WATER DEPARTMENT.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
DAYTON WATER DEPARTMENT
Phone not on record
Dayton, WA 99328