Community Water System · PWSID IL0312580

Riverdale

Serves 10,266 peopleSurface Water PurchasedOwner: Local GovernmentRiverdale, Illinois
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 1992: 6 violations. 3 treatment lapses · 3 notices or reports. Most recent began 2025-07-01.

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

0Over the limit
3Treatment lapse
0Missed or late test
3Notice or report1 open

More violations on record than 68% 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

1992 · Treatment lapse: 11993 · Treatment lapse: 11994 · Treatment lapse: 1199520002004 · Notice or report: 1200520102011 · Notice or report: 1201520202025 · Notice or report: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
50% treatment lapse · 350% notice or report · 3

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

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 5 results on file · action level 15 ppb

14.4 ppb
10 ppb
7.8 ppb
5.9 ppb
5.2 ppb

Open now (1)

  1. 2025-07-01Consumer Confidence RuleCCR Inadequate ReportingOpen

Every violation on record

  1. 2025-07-01Consumer Confidence RuleCCR Inadequate ReportingOpen
  2. 2011-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  3. 2004-07-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  4. 1994-01-01Lead and Copper RulePublic EducationBack in compliance
  5. 1993-01-01Lead and Copper RulePublic EducationBack in compliance
  6. 1992-12-07Lead and Copper RuleOCCT/SOWT Study/RecommendationBack in compliance

System details

Population served10,266
Service connections3,311
Water sourceSurface Water Purchased
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityRiverdale
EPA ZIP on file60827

Areas served

  • Riverdale, Cook County

Reading this record

Riverdale is a community water system that draws from surface water purchased and serves about 10,266 people in Riverdale, 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.