County · Indiana

Lake County, Indiana: drinking water records

Name: Drinking water records for Lake County, Indiana
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 30 community water systems across 27 ZIP codes in Lake County, then find water-testing resources and available recent monitoring-station readings.

In focus30Community 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 16 of the 30 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

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

Water system	People served	PFAS survey results	Health-based violations	Lead, 9 in 10 homes at or below
Hammond Water Works Department IN5245020	78,384	120	1	3 ppbbelow the action level
Indiana American Water - Lowell IN5245029	11,908	120	5	1 ppbbelow the action level
Cedar Lake Water Works IN5245047	4,600	120	1	1.1 ppbbelow the action level
Indiana American Water - Northwest IN5245015	210,510	240	0	3 ppbbelow the action level
Crown Point Water Works IN5245008	30,000	120	0	0.7 ppbbelow the action level
Schererville Water Department IN5245041	30,000	120	0	1 ppbbelow the action level
East Chicago Water Works IN5245012	26,370	120	0	8 ppbbelow the action level
St. John Municipal Water Utility IN5245043	25,700	120	0	2.7 ppbbelow the action level
Highland Water Works IN5245021	23,984	120	0	2.4 ppbbelow the action level
Munster Water Company IN5245031	23,894	120	0	2 ppbbelow the action level
Griffith Water Department IN5245019	16,893	120	0	1.0 ppbbelow the action level
Dyer Water Department IN5245011	16,800	120	0	7.7 ppbbelow the action level
Cuii - Twin Lakes IN5245046	8,000	120	0	2.3 ppbbelow the action level
New Chicago Water Works IN5245032	5,500	120	0	0 ppbbelow the action level
Whiting Water Department IN5245048	4,900	120	0	3.7 ppbbelow the action level
Apple Valley Utilities, INC. IN5245001	712	120	0	0 ppbbelow the action level
Fairway Regional Water District IN5245009	210	0	1	0 ppbbelow the action level
Crossings Mobile Home Park IN5245014	100	0	2	4.6 ppbbelow the action level
Aqua Indiana Water Company IN5245017	1,350	0	0	0 ppbbelow the action level
Cedar Lake - Robins Nest IN5245067	950	0	0	18 ppbat or above the action level
Schneider Water Department IN5245042	267	0	0	0.3 ppbbelow the action level
Lakeshore Subdivision Association, INC. IN5245053	265	0	0	2 ppbbelow the action level
Cedar Lake Mobile Home Park IN5245005	200	0	0	0.1 ppbbelow the action level
Cedar Lake Bible Conference Grounds IN5245055	150	0	0	4.6 ppbbelow the action level
Bremerton Mobile Home Park IN5245004	79	0	0	0.3 ppbbelow the action level
Noble Oaks Subdivision Water Association IN5245054	70	0	0	1.3 ppbbelow the action level
Oakwood Mobile Home Park IN5245034	45	0	0	0.7 ppbbelow the action level
Rockwell Shores Apartments IN5245002	45	0	0	1 ppbbelow the action level
Sunset Harbor Condominiums IN5245028	40	0	0	1.4 ppbbelow the action level
Cedar Gardens MHP IN5245050	34	0	0	0.3 ppbbelow the action level

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. One system in this table is at or above it. What an action level means

USGS · Monitoring stations

The water, more recently.

Available station readings in Lake County, Indiana. 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.

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 2026-09-15 · Source updated 2026-08-05

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 2026-09-15 · Source updated 2026-08-11

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 2026-09-15 · Source updated 2026-09-09

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 2026-09-15

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

27ZIP 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

Cedar Lake
Crown Point
Dyer
East Chicago
Gary
Griffith
Hammond
Highland
Hobart
Lake Station
Lowell
Merrillville
Munster
Schererville
Schneider
Shelby
St. John

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

46303Cedar Lake
46307Crown Point
46311Dyer
46312East Chicago
46319Griffith
46320Hammond
46321Munster
46322Highland
46323Hammond
46324Hammond
46327Hammond
46342Hobart
46356Lowell
46373St. John
46375Schererville
46376Schneider
46377Shelby
46394Hammond
46402Gary
46403Gary
46404Gary
46405Lake Station
46406Gary
46407Gary
46408Gary
46409Gary
46410Merrillville

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.

PFASReading PFAS survey resultsWhat a detection, a reporting level and a yearly average mean in EPA’s PFAS survey records.LeadChoosing a lead filter13 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 Indiana 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.