Confirm the provider
Use the water bill, lease, closing documents, or utility account. Do not assign a city's largest utility to every address.
Indiana metro guide
Northwest Indiana and Lake County
The Chicago-adjacent corridor includes Lake Michigan surface-water systems, purchased-water communities, and groundwater systems within a short distance of one another.
Regional pattern
One metro can contain several very different water systems.
The Chicago-adjacent corridor includes Lake Michigan surface-water systems, purchased-water communities, and groundwater systems within a short distance of one another.
This region's planning themes include Lake Michigan treatment, industrial-corridor source protection, disinfectant byproducts, and address-specific provider verification. The current directory contains 16 researched city pages, with a launch snapshot of 8 address-dependent public supply, 4 surface-water public supply, 3 groundwater public supply, 1 purchased surface-water supply. These categories are orientation—not a substitute for the current report at a specific address.
Boundary warning: postal city, municipal boundary, utility service area, and metropolitan area are not the same thing. Verify the provider shown on the current water bill.
City directory
Northwest Indiana and Lake County city water guides
Open a city page to see the likely public system, source type, PWSID when verified, report-reading questions, PFAS and UCMR context, and treatment decision path.
ChestertonPorter County · Provider-dependentCrown PointLake County · Groundwater or mixed local supplyDyerLake County · Provider-dependentEast ChicagoLake County · Surface waterGaryLake County · Surface waterGriffithLake County · Provider-dependentHammondLake County · Surface waterHighlandLake County · Provider-dependentHobartLake County · Provider-dependentMerrillvilleLake County · Purchased surface waterMunsterLake County · Provider-dependentPortagePorter County · Provider-dependentScherervilleLake County · Provider-dependentSt. JohnLake County · GroundwaterValparaisoPorter County · GroundwaterWhitingLake County · Surface water or purchased water
Read the newest report
Check the reporting year, source, detected contaminants, compliance statements, lead information, and unregulated monitoring notes.
Test the unresolved question
Use an appropriate laboratory or field test when the report cannot answer a premise-plumbing, private-well, or address-specific question.
Evidence first
Turn a water question into a documented plan.
Confirm the supplier or well, collect the right evidence, compare complete treatment claims, and review installation and financing before buying.