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Infrastructure & Environment
Infrastructure & Environment

Infrastructure & environment

Water, trees, streets, and service cycles

Current water-quality benchmarks and public-works service standards, with older regional water-demand data labeled for its actual vintage.

2025 Consumer Confidence Report; service information accessed July 9, 2026

At a glance

Verified headline measures

Every value below is labeled with its geography, reference period, and official source.

Detected-substance table violations

0

Every displayed regulated-substance and lead/copper row is marked “No” in the violation column.

The report separately discloses a corrected 2024–25 CCR adequacy/content violation; see the historical context below.
Oak Brook public water system detected-substance tables2025 Consumer Confidence Report

Lead, 90th percentile

2.11 ppb

The action level shown in the report is 15 ppb.

Oak Brook public water systemSampled 2023; reported in the 2025 CCR

Lead sites above action level

0 of 30
Oak Brook public water system tap-sampling sitesSampled 2023; reported in the 2025 CCR

Parkway tree inventory

>9,000
Village parkwaysCurrent as accessed July 9, 2026

Parkway tree pruning cycle

4 years
This is a scheduled service cycle, not an audited completion result.
Village parkway tree inventoryPublished service cycle accessed July 9, 2026

Emergency backup wells

3

Lake Michigan water is the normal supply; the deep wells are available only for emergencies.

Oak Brook public water system2025 Consumer Confidence Report

Drinking water

Detected levels and regulatory benchmarks

The table preserves each sample year and compares the reported detected value with the applicable action level, maximum contaminant level, or maximum residual disinfectant level.

2025 CCR

Selected detected substances
Oak Brook water detected values, thresholds, sample years, sites above threshold, violation status, and sources.
SubstanceDetectedThresholdSample yearSites aboveViolationSource
Lead2.11 ppb
14.1% of threshold
15 ppb
Action level
20230/30No2025 Consumer Confidence Water Report
Copper0.171 ppm
13.2% of threshold
1.3 ppm
Action level
20230/30No2025 Consumer Confidence Water Report
Haloacetic acids (HAA5)18 ppb
30% of threshold
60 ppb
MCL
2025Not listedNo2025 Consumer Confidence Water Report
Total trihalomethanes (TTHMs)34 ppb
42.5% of threshold
80 ppb
MCL
2025Not listedNo2025 Consumer Confidence Water Report
Chlorine1.1 ppm
27.5% of threshold
4 ppm
MRDL
2025Not listedNo2025 Consumer Confidence Water Report

“No” reproduces the violation field for these contaminant rows. The report separately discloses a corrected 2024–25 CCR adequacy/content violation, shown in the historical context section below.

Change over time

Trend lines

Historical total water withdrawals

Aging data: the latest point is 2018. Historical series reproduced in CMAP's June 2026 release; it is not a current-demand reading.

2008
3.40 MGD
2018
2.71 MGD
Oak Brook community water supplier2008–2018
Historical daily water demand per capita

Aging data: the latest point is 2018. CMAP cautions that service outside municipal boundaries or private wells can affect per-capita values.

2008
428.8 gal/person/day
2018
332.1 gal/person/day
Oak Brook community water supplier / municipal population2008–2018

Current services

Services available now

Current official service descriptions, with agency and geographic limits preserved.

Current

Snow and ice clearing goal

Under normal conditions, Public Works states a goal of plowing and salting Village-owned streets within ten hours after a storm stops; larger storms take longer and other agencies maintain several major roads.

Normal-condition goal
10 hrshours
This is a stated goal, not a measured response-time result.
Village-owned streets and public parking areasPublished service goal accessed July 9, 2026
Current

Storm-inlet cleaning cycles

Troublesome areas are cleaned repeatedly; the Village describes annual cleaning generally and a three-year cycle for trouble-free areas.

General interval
1 yearsyears
Trouble-free interval
3 yearsyears
These are described service cycles, not audited completion results.
Village storm-sewer inletsPublished service cycles accessed July 9, 2026

Older-vintage context

Historical indicators—aging data

Useful context whose underlying period is older than this dashboard's snapshot date.

Historical

Corrected CCR content violation

The 2025 report discloses that a prior annual report did not adequately inform customers. It lists the violation from July 1, 2024 through June 11, 2025 and says a satisfactory CCR was submitted in 2025 with an updated compliance process.

This administrative disclosure is separate from the contaminant-table violation fields.
Oak Brook public water system reporting complianceJuly 1, 2024–June 11, 2025
Reading this page

A detected substance does not by itself mean the water is unsafe; the table compares each detected level with the report's regulatory or action threshold.

The 2008–2018 water-demand series is historical even though CMAP reproduced it in a June 2026 publication.

Snow clearing, inlet cleaning, and pruning intervals are presented as stated goals or cycles, not achieved performance results.