WA5319200 · Washington
DIABLO WTR SYS-SEATTLE CITY LIGHT
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 6
- EPA health-based flag
- 1
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 3
Counties listed by EPA · Whatcom County, Washington
Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.
Violations and what followed
Among 6 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 360 days. The interval uses the reporting periods and dates on file.
EPA health-based flag · Resolved
OCCT/SOWT Study/RecommendationViolation 3283397 · Lead and Copper Rule · Lead and Copper RuleNoncompliance period start October 23, 2025 · period end February 6, 2026 · first reported March 26, 2026 · EPA return-to-compliance field February 6, 2026
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 3283397ENF February 6, 2026 Resolving State Compliance achieved Other or unclassified · Resolved
Consumer Confidence Report Complete Failure to ReportViolation 2464926 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2024 · period end June 22, 2025 · first reported June 27, 2025 · EPA return-to-compliance field June 22, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 64926ENF June 22, 2025 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 2285142 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2022 · period end December 31, 2022 · first reported March 31, 2023 · EPA return-to-compliance field December 31, 2022
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2785142ENF July 18, 2023 Resolving State Compliance achieved Other or unclassified · Resolved
Consumer Confidence Report Complete Failure to ReportViolation 2158669 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2021 · period end November 29, 2021 · first reported September 28, 2022 · EPA return-to-compliance field November 29, 2021
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 58669ENF November 29, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 2666961 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2021 · period end December 31, 2023 · first reported March 29, 2024 · EPA return-to-compliance field December 31, 2023
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2666961ENF September 19, 2024 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 2663936 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2021 · period end December 31, 2023 · first reported March 29, 2024 · EPA return-to-compliance field December 31, 2023
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2663936ENF September 19, 2024 Resolving State Compliance achieved
EPA data and scope
How to read the records
The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.
- We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
- EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
- Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
- We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.
EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility