Transient Non-Community · PWSID OR4195243

Diamond Lake Gas Station

Serves 45 peopleSurface WaterOwner: PrivateRiddle, Oregon
1 open treatment violation.

Open for: Revised Total Coliform Rule. EPA counts treatment-technique violations as health-based: a required protective step was not done. It is not a measurement of contamination.

On record since 2017: 53 violations. 1 over the limit · 1 treatment lapse · 50 missed or late tests · 1 notice or report. Most recent began 2025-09-01.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

1Over the limit
1Treatment lapse1 open
50Missed or late test1 open
1Notice or report1 open

More violations on record than 91% of active water systems in Oregon. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2005201020152017 · Missed or late test: 22018 · Missed or late test: 22019 · Missed or late test: 32020 · Missed or late test: 220202021 · Missed or late test: 42021 · Missed or late test: 42022 · Over the limit: 12024 · Missed or late test: 72024 · Missed or late test: 72024 · Missed or late test: 72025 · Treatment lapse: 12025 · Missed or late test: 302025 · Missed or late test: 302025 · Missed or late test: 302025 · Missed or late test: 302025 · Missed or late test: 302025 · Missed or late test: 302025 · Missed or late test: 302025 · Missed or late test: 302025 · Missed or late test: 302025 · Missed or late test: 302025 · Notice or report: 12025
One square ≈ 3 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
2% over the limit · 12% treatment lapse · 194% missed or late test · 502% notice or report · 1

Across Oregon, 85% of violations are missed or late tests and 2% are water over a limit.

What you can do

  • Total Coliform Bacteria: If your water system has coliform violations, consider boiling water or using bottled water until the system confirms the issue is resolved. Contact your water provider for their latest test results and any boil-water advisories.

Open now (3)

  1. 2025-05-03Public NoticePN Violation for NPDWR ViolationOpen
  2. 2025-02-23Revised Total Coliform RuleTTOpen
  3. 2025-01-20E. ColiMonitoring, Source Water (GWR)Open

Every violation on record

  1. 2025-09-01Surface water treatment (SWTR) ×2Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  2. 2025-09-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  3. 2025-08-01Surface water treatment (SWTR) ×2Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  4. 2025-08-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  5. 2025-07-01Surface water treatment (SWTR) ×2Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  6. 2025-07-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  7. 2025-06-01Surface water treatment (SWTR) ×2Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  8. 2025-06-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  9. 2025-05-03Public NoticePN Violation for NPDWR ViolationOpen
  10. 2025-05-01Surface water treatment (SWTR) ×2Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  11. 2025-05-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  12. 2025-04-01Surface water treatment (SWTR) ×2Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  13. 2025-04-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  14. 2025-03-01Surface water treatment (SWTR) ×3Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  15. 2025-03-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  16. 2025-02-23Revised Total Coliform RuleTTOpen
  17. 2025-02-01Surface water treatment (SWTR) ×3Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  18. 2025-02-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  19. 2025-01-20E. ColiMonitoring, Source Water (GWR)Open
  20. 2025-01-01Surface water treatment (SWTR) ×3Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  21. 2024-12-01Surface water treatment (SWTR) ×3Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  22. 2024-11-01Surface water treatment (SWTR) ×3Monitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  23. 2024-01-01ColiphageFailure to Conduct Assessment MonitoringPeriod ended · no return to compliance on file
  24. 2022-05-01Revised Total Coliform RuleMCLPeriod ended · no return to compliance on file
  25. 2021-12-01Revised Total Coliform RuleMONBack in compliance
Show the other 12 entries
  1. 2021-04-01Revised Total Coliform RuleMONBack in compliance
  2. 2021-01-01NitrateMonitoring, RegularBack in compliance
  3. 2021-01-01Revised Total Coliform RuleMONBack in compliance
  4. 2020-10-01Revised Total Coliform RuleMONBack in compliance
  5. 2020-01-01ColiphageFailure to Conduct Assessment MonitoringBack in compliance
  6. 2019-07-01Revised Total Coliform RuleMONBack in compliance
  7. 2019-01-01NitrateMonitoring, RegularBack in compliance
  8. 2019-01-01ColiphageFailure to Conduct Assessment MonitoringBack in compliance
  9. 2018-04-01Revised Total Coliform RuleMONBack in compliance
  10. 2018-01-01ColiphageFailure to Conduct Assessment MonitoringBack in compliance
  11. 2017-01-01ColiphageFailure to Conduct Assessment MonitoringBack in compliance
  12. 2017-01-01Revised Total Coliform RuleMONBack in compliance

System details

Population served45
Service connections2
Water sourceSurface Water
System typeTransient Non-Community
OwnerPrivate
StatusActive
CityRiddle
EPA ZIP on file97469

Areas served

  • Douglas County

Reading this record

Diamond Lake Gas Station is a transient non-community that draws from surface water and serves about 45 people in Riddle, Oregon. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.