Public water system record
Diablo Wtr Sys-Seattle City Light
Serves an area of Whatcom County, WA · 53 people served
Federal records show 1 health-based violation and 5 monitoring/reporting issues for Diablo Wtr Sys-Seattle City Light in the last ten years. The most serious issue in this window was a resolved Lead and Copper Rule violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 5
Key facts
- Diablo Wtr Sys-Seattle City Light draws water from 1 well.
- Record on file since 1979, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 2 unknown out of 25 service lines.
Check whether Diablo Wtr Sys-Seattle City Light serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Lead and Copper Rule
Treatment technique failure
|
350 | Oct 23, 2025 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2024 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2021 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
Full record since 1979
EPA's records for Diablo Wtr Sys-Seattle City Light go back to 1979. Before October 19, 2016 they list 1 health-based violation (1 archived by EPA without a recorded fix) and 15 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 9 |
| 1990s | 1 | 1 |
| 2000s | 0 | 3 |
| 2010 to October 18, 2016 | 0 | 2 |
| 2020s | 1 | 5 |
Most recent health-based violation before October 19, 2016: Total Coliform, began November 1992, Archived.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1992 | Archived |
What the violations mean
Lead and Copper Rule
1 incidentThe system did not complete a treatment step or action that the Lead and Copper Rule requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
Diablo Wtr Sys-Seattle City Light draws water from 1 well.
Annual water quality report
Diablo Wtr Sys-Seattle City Light must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Diablo Wtr Sys-Seattle City Light for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Washington.
Certified drinking water labs by state EPA guidance for private wells