Oak Brook Water Quality
Illinois
According to EPA SDWIS, Oak Brook, Illinois is served by 7 community water systems covering about 13,471 people. The same extract lists 6 health-based violation records, most recently coded 0700 in 2023. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Oak Brook, Illinois is delivered through 7 EPA-regulated community water systems serving an estimated 13,471 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 6 violation records across the 7 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: Groundwater Rule, Stage 1 Disinfectants and Disinfection Byproducts Rule, Lead and Copper Rule.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Illinois drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| OAK BROOK | 9,400 | 0 | Clean |
| NORTHFIELD ESTATES | 1,620 | 0 | Clean |
| SUBURBAN APARTMENTS (DE KALB UNIV DVL) | 1,050 | 1 | Health |
| FORREST BROOKE MHP | 491 | 4 | Health |
| WHISPERING PINES MHP | 400 | 1 | Health |
| SILVER SHORES MOBILE HOME PARK | 360 | 0 | Clean |
| WEEKI WACHEE NORTH TP | 150 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| FORREST BROOKE MHP | Groundwater Rule | 2023-05-01 |
| FORREST BROOKE MHP | Groundwater Rule | 2023-05-01 |
| FORREST BROOKE MHP | Groundwater Rule | 2023-04-01 |
| FORREST BROOKE MHP | Groundwater Rule | 2023-04-01 |
| WHISPERING PINES MHP | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2009-08-01 |
| SUBURBAN APARTMENTS (DE KALB UNIV DVL) | Lead and Copper Rule | 1994-07-01 |
What are Oak Brook's health-based records for?
Oak Brook's health-based violation records carry 3 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Groundwater Rule | 4 | 1 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 1 | 1 |
| Lead and Copper Rule | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Oak Brook, Illinois? ▼
How many water violations does Oak Brook have in this EPA extract? ▼
What contaminants were found in Oak Brook water? ▼
How many water systems serve Oak Brook? ▼
Where does Oak Brook get its drinking water? ▼
How does Oak Brook compare in Illinois?
Of the 1,034 Illinois places with at least one community water system on file, Oak Brook ranks #24 by number of systems (7).
Either side of it: Mundelein (7), Nashville (7), Ottawa (7), Winchester (7)
About This Data
Figures here are the current EPA SDWIS extract joined to the 7 community water systems whose service area lists Oak Brook, ranked against the 1,034 Illinois places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.