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County · Illinois

Lake County, Illinois: drinking water records

Explore EPA records for 103 community water systems across 28 ZIP codes in Lake County, then find water-testing resources and available recent monitoring-station readings.

In focus103Community water systems
Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 35 of the 103 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

35
systems in EPA's PFAS survey
3
systems where PFAS was found
0
systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses
37
systems that have reached the lead action level
11
systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 103 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water systemPeople servedPFAS survey resultsPFAS foundHealth-based violationsLead, 9 in 10 homes at or below
North Chicago IL097125016,813120020 ppb
Volo IL09717706,629120010 ppb
Round Lake Park IL09716004,900180011.4 ppb
Waukegan IL097190087,149120009 ppb
Vernon Hills - Lake Co Pw IL097175033,207120000 ppb
Mundelein IL097115031,500120007.4 ppb
Gurnee IL097035030,193120000.3 ppb
Highland Park IL097050030,1761200011 ppb
Round Lake Beach IL097155027,200120004.6 ppb
Zion IL097200024,442120009.1 ppb
Great Lakes Naval Training Station IL097522723,000120000.8 ppb
Grayslake IL097025021,2481200012 ppb
Libertyville IL097090020,500120108.4 ppb
Lake Zurich IL097085019,759300206.9 ppb
Lake Forest IL097080019,6421200028 ppbat or above the action level
Deerfield IL097434019,196120005.2 ppb
Round Lake IL097150018,430120002.5 ppb
Wauconda IL097185015,349120009.6 ppb
Wildwood Subdivision - Lake Co Pw IL097735014,832120001.3 ppb
Lindenhurst IL097100014,500120003.9 ppb
Antioch IL097005014,175420009 ppb
Fox Lake IL097020011,780240206.1 ppb
Barrington IL097408010,327120009.2 ppb
Lake Villa IL09708408,829120002.6 ppb
Beach Park IL09701908,710120000 ppb
Island Lake IL09745408,066120002.3 ppb
Lincolnshire IL09709507,940120000 ppb
Winthrop Harbor IL09719506,565120005.7 ppb
Grandwood Park Subdivision - Lake Co Pw IL09756005,751120001.1 ppb
Lake Bluff IL09707505,600120005.6 ppb
Park City IL09714005,425120000 ppb
Highwood IL09705505,3351200076 ppbat or above the action level
Lcpw - Pekara Subdivision IL09759003,711300004.7 ppb
Riverwoods IL09714503,618120002.5 ppb
Hainesville IL09704003,528120000 ppb
Aqua Illinois-Hawthorn Woods IL09750403,0650011.7 ppb
Lake Barrington Shores Subdivsion IL09755202,3000016.7 ppb
Green Oaks IL09700401,4700010 ppb
Tanneron Bay Homeowners Association IL09711302560010 ppb
Towners Subdivision IL097725020600112.1 ppb
Duck Lake Well Owners Association IL09753801410014.8 ppb
Elm Oak Mutual Water System IL0975736500020 ppb
Bluff Lake Lodges, INC. IL0970240240010 ppb
Lakemoor IL09702702,7200000 ppb
Fox Lake Hills Subdivision - Lake Co Pw IL09755502,6280000 ppb
Round Lake Heights IL09702602,6220001.4 ppb
Saddlebrook Farms IL09701202,5580004.2 ppb
Park City MHP IL09755752,4600000 ppb
Aqua Illinois-Rockwell IL09701101,7620001.1 ppb
Lcpw - Brooks Farm Subdivision IL09702801,5630001.2 ppb
Wynstone Water Company IL09700801,4240001.2 ppb
Tower Lakes IL09750101,3720000 ppb
Countryside Lake Subdivision -Lake Co Pw IL09752001,2870000.9 ppb
Prairie Path Water Company-Harbor Ridge IL09756201,0640003 ppb
Bannockburn IL09701001,0130002.8 ppb
Lake County Pw- Hawthorn Woods IL097045067500013.8 ppb
Cambridge Courts MHP IL09715406580002.6 ppb
Aqua Illinois-Ivanhoe IL09701806500000 ppb
Beach MHP IL09700106240000 ppb
West Shore Park Subdivision IL09773705900002.7 ppb
Lake View MHP IL09753455680000 ppb
Shoreline Trc MHP IL09756155040000 ppb
Lake Barrington IL097108050000015 ppbat or above the action level
Hilldale Manor Subdivision IL09757004140001.6 ppb
Allendale Association IL09751394000002.9 ppb
Royal Melbourne Homeowners Asn IL09701703820000 ppb
Whispering Lakes Water System, INC. IL09702203750000 ppb
Lcpw - Highland Lake Subdivision IL09757503300005.1 ppb
Prairie Path Water Company-Del-Mar IL09753703000008.4 ppb
Ports Sullivan Lake Owners Association IL097116029300010.7 ppb
Schwermanns 2nd and 3rd Wtr Brd IL09771502850008.9 ppb
Aqua Illinois-Ravenna IL09750702670000 ppb
Fields of Long Grove IL09710502670001.2 ppb
Prairie Path Water Company-Valentine IL09773002520001.4 ppb
Aqua Illinois-Fairhaven Estates IL09754502250003 ppb
Brookdale Senior Living - Vernon Hills IL09717002250000 ppb
Forest Lake Addition - Lake Co Pw IL09755002250005.0 ppb
Alden Long Grove Nursing Center IL09710902180002.4 ppb
Heiden Gardens Condos IL09752382170002.4 ppb
Sylvan Lake 1st Subdivision IL09771002100000 ppb
Briarcrest Sbdv Homeowners Association IL09710602070000 ppb
The Preserve at Long Grove IL09703102040000 ppb
Avantara Long Grove IL09711102000000 ppb
Diamond Lake MHP IL09751851980000.2 ppb
Prairie Trails of Long Grove IL09712001890001.4 ppb
West Shoreland Subdivision IL09770501890000 ppb
Prairie Path Water Company-Char-Mar IL09753501860000 ppb
Wadsworth Oaks Subdivision IL09773201850001.8 ppb
Lake Bluff Estates MHP IL09755851650000 ppb
Mount St Joseph School Icf IL09758491250001.8 ppb
Lake Co. Pw - Arden Shores Estates IL09750501050000 ppb
Chain-O-Lakes MHP IL0975165840001.4 ppb
Promontory Pointe Homeowners Association IL0970320780000 ppb
Long Grove IL0970340700002 ppb
Prairie Path -Port Barrington Shores IL0971120670000 ppb
Glenstone Sbdv HOA IL0970160650003.6 ppb
New Perspective Senior Living IL0970330620000 ppb
Holly Hock Hill MHP IL0975245470000 ppb
Lcpw - Oak Terrace IL0978970450000 ppb
Pauls MHP IL0975485380002.7 ppb
Dayspring Bible College IL0977189300001 ppb
Lake County Public Water District IL09757901000not reported
Central Lake County Jawa IL09710700000not reported

Shaded rows report lead at or above the 15 ppb action level in their latest monitoring period. EPA sets that level for the value 9 in 10 sampled homes fall at or below; reaching it requires the utility to act, and it is not a measurement of any single tap. 3 systems in this table are at or above it. What an action level means

USGS · Monitoring stations

The water, more recently.

Available station readings in Lake County, Illinois. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

Station coverage and available measurements vary by county.

Explore USGS Water Data
How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed · Source updated

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed · Source updated

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed · Source updated

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in Lake County

28ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

  • Antioch
  • Buffalo Grove
  • Deerfield
  • Fox Lake
  • Grayslake
  • Gurnee
  • Highland Park
  • Highwood
  • Island Lake
  • Lake Bluff
  • Lake Forest
  • Lake Villa
  • Libertyville
  • Lincolnshire
  • Long Grove
  • Long Lake
  • Mundelein
  • North Chicago
  • Old Mill Creek
  • Round Lake
  • Vernon Hills
  • Wauconda
  • Waukegan
  • Winthrop Harbor
  • Zion
Explore water-system recordsFind water-testing resources
View ZIP areas and understand coverage
  • 60002Antioch
  • 60015Deerfield
  • 60020Fox Lake
  • 60030Grayslake
  • 60031Gurnee
  • 60035Highland Park
  • 60040Highwood
  • 60041Long Lake
  • 60042Island Lake
  • 60044Lake Bluff
  • 60045Lake Forest
  • 60046Lake Villa
  • 60047Long Grove
  • 60048Libertyville
  • 60060Mundelein
  • 60061Vernon Hills
  • 60064North Chicago
  • 60069Lincolnshire
  • 60073Round Lake
  • 60075
  • 60083Old Mill Creek
  • 60084Wauconda
  • 60085Waukegan
  • 60087Waukegan
  • 60088North Chicago
  • 60089Buffalo Grove
  • 60096Winthrop Harbor
  • 60099Zion

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 3 of the 35 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter37 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near Lake County

All Illinois counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.

Keep exploring

Every record tells
part of the story.

Find a place. Read the measurements.
Understand the context.

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