Lake County Water Quality: 11 Cities Ranked by the Records

Name: Lake County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Lake County, Indiana: 11 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Lake County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 2 systems of 11 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest148 µg/L

INDIANA AMERICAN WATER - LOWELL148 µg/LSample date: 2024-03-07 to 2024-12-05
CEDAR LAKE WATER WORKS41.5 µg/LSample date: 2024-03-06 to 2026-01-13
CROWN POINT WATER WORKSNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-03-23 to 2023-12-15
DYER WATER DEPARTMENTNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-08-20 to 2025-05-13
EAST CHICAGO WATER WORKSNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-03-05 to 2024-12-02
GRIFFITH WATER DEPARTMENTNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-02-14 to 2024-11-13
HAMMOND WATER WORKS DEPARTMENTNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-11-25 to 2025-08-26
HIGHLAND WATER WORKSNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-02-26 to 2024-11-25
INDIANA AMERICAN WATER - NORTHWESTNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-06-06 to 2024-03-05
MUNSTER WATER COMPANYNot detected · below 9.0 µg/L lab reporting limitSample date: 2025-01-13 to 2025-09-30
SCHERERVILLE WATER DEPARTMENTNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-01-24 to 2023-10-11

Lead (90th percentile)Detected in 11 systems15 µg/L federal action level · US EPAHighest14.5 µg/L

CEDAR LAKE WATER WORKS14.5 µg/LMonitoring period: 2025–2027 (still open)
DYER WATER DEPARTMENT9.9 µg/LMonitoring period: 2024–2026 (still open)
EAST CHICAGO WATER WORKS8 µg/LMonitoring period: 2022–2024
HAMMOND WATER WORKS DEPARTMENT3 µg/LMonitoring period: 2025–2025
INDIANA AMERICAN WATER - NORTHWEST3 µg/LMonitoring period: 2022–2024
HIGHLAND WATER WORKS2.4 µg/LMonitoring period: 2021–2023
MUNSTER WATER COMPANY2 µg/LMonitoring period: 2021–2023
GRIFFITH WATER DEPARTMENT1.01 µg/LMonitoring period: 2021–2023
INDIANA AMERICAN WATER - LOWELL1 µg/LMonitoring period: 2023–2025
SCHERERVILLE WATER DEPARTMENT1 µg/LMonitoring period: 2021–2023
CROWN POINT WATER WORKS0.7 µg/LMonitoring period: 2022–2024

29 PFAS tested, none detected in any systemShow

Tested in these 11 systems: CEDAR LAKE WATER WORKS, CROWN POINT WATER WORKS, DYER WATER DEPARTMENT, EAST CHICAGO WATER WORKS, GRIFFITH WATER DEPARTMENT, HAMMOND WATER WORKS DEPARTMENT, HIGHLAND WATER WORKS, INDIANA AMERICAN WATER - LOWELL, INDIANA AMERICAN WATER - NORTHWEST, MUNSTER WATER COMPANY, SCHERERVILLE WATER DEPARTMENT

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

11 cities

Cities ranked by the records

1
Crown PointCROWN POINT WATER WORKS
No PFAS detectedLead below action level
Open city report →
2
ScherervilleSCHERERVILLE WATER DEPARTMENT
No PFAS detectedLead below action level
Open city report →
3
GriffithGRIFFITH WATER DEPARTMENT
No PFAS detectedLead below action level
Open city report →
4
MunsterMUNSTER WATER COMPANY
No PFAS detectedLead below action level
Open city report →
5
GaryINDIANA AMERICAN WATER - NORTHWEST
No PFAS detectedLead below action level
Open city report →
6
HighlandHIGHLAND WATER WORKS
No PFAS detectedLead below action level
Open city report →
7
HammondHAMMOND WATER WORKS DEPARTMENT
No PFAS detectedLead below action level
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8
LowellINDIANA AMERICAN WATER - LOWELL
No PFAS detectedLead below action level
Open city report →
9
East ChicagoEAST CHICAGO WATER WORKS
No PFAS detectedLead below action level
Open city report →
10
DyerDYER WATER DEPARTMENT
No PFAS detectedLead below action level
Open city report →
11
Cedar LakeCEDAR LAKE WATER WORKS
No PFAS detectedLead below action level
Open city report →

Showing 6 of 11 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Lake CountyPFAS detected in 0 of 11 cities; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Indiana

Lead

0of 11 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Indiana

Who supplies the county

Largest water systems

GaryINDIANA AMERICAN WATER - NORTHWEST · IN5245015
210,510 served
HammondHAMMOND WATER WORKS DEPARTMENT · IN5245020
78,384 served
Crown PointCROWN POINT WATER WORKS · IN5245008
30,000 served
ScherervilleSCHERERVILLE WATER DEPARTMENT · IN5245041
30,000 served
East ChicagoEAST CHICAGO WATER WORKS · IN5245012
26,370 served
HighlandHIGHLAND WATER WORKS · IN5245021
23,984 served
MunsterMUNSTER WATER COMPANY · IN5245031
23,894 served
GriffithGRIFFITH WATER DEPARTMENT · IN5245019
16,893 served
DyerDYER WATER DEPARTMENT · IN5245011
16,800 served
LowellINDIANA AMERICAN WATER - LOWELL · IN5245029
11,908 served

Questions

Frequently asked

How does Lake County tap water compare across cities?

PurityMap ranks 11 cities in Lake County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Crown Point's main water system: CROWN POINT WATER WORKS · PWSID IN5245008 · Purity Score 99 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Lake County cities had a PFAS sample above a 2024 EPA limit?

None of the 11 Lake County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.

Is there lead in Lake County tap water?

Utilities report lead as a 90th-percentile result from home taps. 11 of 11 Lake County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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