Transient Non-Community · PWSID OR4195225

Circle K #9641

Serves 100 peopleGroundwaterOwner: PrivateCorona, California
Nothing open that measures the water, but 1 open testing or paperwork violation.

A missed test is not evidence of bad water. It also is not evidence of good water: for that period nobody checked.

On record since 2010: 14 violations. 1 over the limit · 12 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
0Treatment lapse
12Missed or late test
1Notice or report1 open

More violations on record than 90% of active water systems in California. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

20052010 · Missed or late test: 22010 · Missed or late test: 220102011 · Notice or report: 12015 · Missed or late test: 22015 · Missed or late test: 220152020 · Missed or late test: 22020 · Missed or late test: 220202021 · Missed or late test: 12023 · Missed or late test: 32023 · Missed or late test: 32023 · Missed or late test: 32025 · Over the limit: 12025 · Missed or late test: 22025 · Missed or late test: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
7% over the limit · 186% missed or late test · 127% notice or report · 1

Across California, 52% of violations are missed or late tests and 29% are water over a limit.

Open now (1)

  1. 2011-01-20Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-09-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  2. 2025-08-01Revised Total Coliform RuleMCLPeriod ended · no return to compliance on file
  3. 2025-03-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  4. 2023-11-01Revised Total Coliform RuleMONBack in compliance
  5. 2023-06-01Revised Total Coliform RuleMONBack in compliance
  6. 2023-05-01Revised Total Coliform RuleMONBack in compliance
  7. 2021-01-01Revised Total Coliform RuleMONBack in compliance
  8. 2020-10-01Revised Total Coliform RuleMONBack in compliance
  9. 2020-01-01NitrateMonitoring, RegularBack in compliance
  10. 2015-10-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  11. 2015-01-01NitrateMonitoring, RegularBack in compliance
  12. 2011-01-20Public NoticePN Violation for NPDWR ViolationOpen
  13. 2010-11-01E. ColiMonitoring, Source Water (GWR)Back in compliance
  14. 2010-10-01E. ColiMonitoring, Source Water (GWR)Back in compliance

System details

Population served100
Service connections1
Water sourceGroundwater
System typeTransient Non-Community
OwnerPrivate
StatusActive
CityCorona
EPA ZIP on file92879

Areas served

  • Marion County

Reading this record

Circle K #9641 is a transient non-community that draws from groundwater and serves about 100 people in Corona, California. 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.