Transient Non-Community · PWSID IL3031021

Johnsons Mound Forest Preserve (31021)

Serves 100 peopleGroundwaterOwner: Public/PrivateWest Chicago, Illinois
2 open treatment violations.

Open for: Groundwater 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 2019: 18 violations. 5 treatment lapses · 8 missed or late tests · 5 notices or reports. Most recent began 2025-02-16.

None of them is a measurement of contaminated water.

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

0Over the limit
5Treatment lapse2 open
8Missed or late test
5Notice or report2 open

More violations on record than 89% of active water systems in Illinois. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2005201020152019 · Missed or late test: 12020 · Missed or late test: 42020 · Missed or late test: 42020 · Missed or late test: 42020 · Missed or late test: 420202021 · Treatment lapse: 12021 · Missed or late test: 12022 · Treatment lapse: 12022 · Missed or late test: 22022 · Missed or late test: 22022 · Notice or report: 22022 · Notice or report: 22023 · Notice or report: 12024 · Treatment lapse: 12024 · Notice or report: 22024 · Notice or report: 22025 · Treatment lapse: 22025 · Treatment lapse: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
28% treatment lapse · 544% missed or late test · 828% notice or report · 5

Across Illinois, 81% of violations are missed or late tests and 3% are water over a limit.

Open now (4)

  1. 2025-02-16Groundwater Rule ×2Failure To Address DeficiencyOpen
  2. 2024-07-21Public NoticePN Violation for NPDWR ViolationOpen
  3. 2024-01-24Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-02-16Groundwater Rule ×2Failure To Address DeficiencyOpen
  2. 2024-07-21Public NoticePN Violation for NPDWR ViolationOpen
  3. 2024-05-02Revised Total Coliform RuleTTBack in compliance
  4. 2024-01-24Public NoticePN Violation for NPDWR ViolationOpen
  5. 2023-07-22Public NoticePN Violation for NPDWR ViolationBack in compliance
  6. 2022-10-01Revised Total Coliform RuleMONBack in compliance
  7. 2022-09-10Public NoticePN Violation for NPDWR ViolationBack in compliance
  8. 2022-07-23Public NoticePN Violation for NPDWR ViolationBack in compliance
  9. 2022-07-01Revised Total Coliform RuleTTBack in compliance
  10. 2022-04-01Revised Total Coliform RuleMONBack in compliance
  11. 2021-07-01Revised Total Coliform RuleTTBack in compliance
  12. 2021-04-01Revised Total Coliform RuleMONBack in compliance
  13. 2020-10-01Revised Total Coliform RuleMONBack in compliance
  14. 2020-07-01Revised Total Coliform RuleMONBack in compliance
  15. 2020-04-01Revised Total Coliform RuleMONBack in compliance
  16. 2020-01-01NitrateMonitoring, RegularBack in compliance
  17. 2019-01-01NitrateMonitoring, RegularBack in compliance

System details

Population served100
Service connections1
Water sourceGroundwater
System typeTransient Non-Community
OwnerPublic/Private
StatusActive
CityWest Chicago
EPA ZIP on file60185

Areas served

  • Kane County

Reading this record

Johnsons Mound Forest Preserve (31021) is a transient non-community that draws from groundwater and serves about 100 people in West Chicago, Illinois. 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.