Community Water System · PWSID IL1150350

Mount Zion

Serves 5,833 peopleSurface Water PurchasedOwner: Local GovernmentMount Zion, Illinois
Nothing open right now.

On record since 2009: 14 violations. 7 over the limit · 1 treatment lapse · 3 missed or late tests · 3 notices or reports. Most recent began 2024-10-01.

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

7Over the limit
1Treatment lapse
3Missed or late test
3Notice or report

More violations on record than 87% 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

20052009 · Missed or late test: 120102013 · Notice or report: 12015 · Notice or report: 120152019 · Missed or late test: 120202021 · Over the limit: 12021 · Treatment lapse: 12021 · Missed or late test: 12021 · Notice or report: 12022 · Over the limit: 22022 · Over the limit: 22024 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
50% over the limit · 77% treatment lapse · 121% missed or late test · 321% notice or report · 3

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

How far over the limit

at the limit2×5×10×100×+Trihalomethanes (TTHM)2024-10-01 · Trihalomethanes (TTHM): measured 0.0820 MG/L vs limit 0.0800 MG/L (1.0×)2024-07-01 · Trihalomethanes (TTHM): measured 0.0850 MG/L vs limit 0.0800 MG/L (1.1×)2024-04-01 · Trihalomethanes (TTHM): measured 0.0830 MG/L vs limit 0.0800 MG/L (1.0×)2024-01-01 · Trihalomethanes (TTHM): measured 0.0830 MG/L vs limit 0.0800 MG/L (1.0×)2022-04-01 · Trihalomethanes (TTHM): measured 0.0870 MG/L vs limit 0.0800 MG/L (1.1×)2022-01-01 · Trihalomethanes (TTHM): measured 0.0850 MG/L vs limit 0.0800 MG/L (1.1×)2021-10-01 · Trihalomethanes (TTHM): measured 0.0910 MG/L vs limit 0.0800 MG/L (1.1×)
Each dot is one over-the-limit violation: the measured value divided by the limit it broke, on a log scale. Most legal limits for chemicals are running averages set for a lifetime of drinking, so “just over” and “ten times over” are very different news. Hover a dot for the numbers.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 7 results on file · action level 15 ppb

23.3 ppb
1.5 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb

Every violation on record

  1. 2024-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0820 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  2. 2024-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0850 MG/L · limit 0.0800 MG/LBack in compliance
  3. 2024-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0830 MG/L · limit 0.0800 MG/LBack in compliance
  4. 2024-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0830 MG/L · limit 0.0800 MG/LBack in compliance
  5. 2022-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0870 MG/L · limit 0.0800 MG/LBack in compliance
  6. 2022-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0850 MG/L · limit 0.0800 MG/LBack in compliance
  7. 2021-12-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  8. 2021-12-30Public NoticePN Violation for NPDWR ViolationBack in compliance
  9. 2021-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0910 MG/L · limit 0.0800 MG/LBack in compliance
  10. 2021-06-06Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationBack in compliance
  11. 2019-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  12. 2015-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  13. 2013-07-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  14. 2009-10-01Lead and Copper RuleLead Consumer NoticeBack in compliance

System details

Population served5,833
Service connections1,930
Water sourceSurface Water Purchased
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityMount Zion
EPA ZIP on file62549

Areas served

  • Mount Zion, Macon County

Reading this record

Mount Zion is a community water system that draws from surface water purchased and serves about 5,833 people in Mount Zion, 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.