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Review government records associated with Merrillville, Indiana.
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Check your water bill for your utility name and confirm the reporting year. See EPA’s guide to finding your annual water quality report.
Public water-system records for Merrillville, IN from EPA SDWIS.
Schererville Water Department
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
Purchased or imported water record · Serves 30,000 people
Munster Water Company
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
Purchased or imported water record · Serves 23,894 people
St. John Municipal Water Utility
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 25,700 people
Data from EPA SDWIS
Reviewed: source records as of Q1 2026
EPA UCMR5 — No PFAS detection records shown for these water systems
Open data source: EPA UCMR5DoD PFAS — No investigation records shown for this report
Open data source: DoD PFASEPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
City of Merrillville-Turkey Creek
Reported: Nov 2026
Health-relevant causes: Pathogens
Affected uses: Ecological, Recreation
Data from EPA ATTAINS
Reviewed: source records as of Q4 2025
To investigate water contamination, check the sampling locations, dates and results below. For tap water records, see Drinking water quality above.
Reviewed: source records as of 2026
Review historical EPA air pollution records, including monitoring and facility emissions where available. For current conditions, check local air quality on AirNow.
Lake County
Assessment year: 2020
According to EPA, a cancer risk of 30-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 30 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top modeled source groups
Data from EPA AirToxScreen
EPA designations apply to a specific pollutant and federal air quality standard (NAAQS). EPA can issue a clean-data determination while a formal designation remains in effect.
Chicago: Ozone
NonattainmentSerious8-Hour Ozone (2015 Standard)
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
Chicago-Naperville
Ozone · 8-Hour Ozone (2008 Standard)
Classification: Serious
Original designation: Jul 2012
Current design value: 0.079 ppm (2023-2025)
1997 Primary Annual PM2.5 Designations
Chicago-Gary-Lake County
EPA revoked the 1997 primary annual PM2.5 standard in this redesignated area.
Original designation: Apr 2005
Open data source: EPA final primary annual revocation ruleOpen data source: EPA designation statusData from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Arcelormittal-Burns Harbor Site 1 — Portage, Indiana
Annual mean: 6.1 Parts per billion
EPA primary exceedance count: 3 (SO2 1-hour 2010)
Observation year: 2025
East Chicago- Franklin School/ Washington School (Ben. Franklin)
Annual mean: 17.4 Micrograms/cubic meter (25 C)
Observation year: 2025
Annual mean: 8.5 Micrograms/cubic meter (LC)
Observation year: 2025
Data from EPA AQS
Facilities regulated under the Clean Air Act. CAA HPV flags indicate serious noncompliance such as exceeding emission limits.
Air Violations
Last inspected: Dec 2025
Data from EPA ECHO
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
Allied Tube & Conduit - Hobart
Reported: 2024
Modern Forge Indiana LLC
Reported: 2024
Reviewed: source query run Nov 2026
Reviewed: source query run Nov 2026
Release reports
Reported: Dec 2021
Reported: Dec 2021
Data from EPA UST Finder
Reviewed: reporting year 2024
No MSHA mine or extraction site records shown for this report.
Lake County, IN
EPA Radon Zone Map (June 2024 release)
Lake County is EPA Radon Zone 2 (moderate potential). EPA defines Zone 2 counties as having predicted average indoor screening levels between 2 pCi/L and 4 pCi/L.
Radon levels can vary from home to home, so EPA recommends testing the property to know its indoor level.
FEMA flood zones describe mapped flood hazards. Look up a specific address with FEMA.
Minimal flood hazard — outside the 1% and 0.2% annual chance floodplains.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
EPA ECHO lists facilities linked to the Risk Management Program. Results include facilities with locations that can be matched. Records may be historical. Current operations, chemical inventories, and recent accident history are unverified.
Reviewed: 2000-present
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Lake County, IndianaPop. 499,689
County Health Rankings edition: 2024
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking water violation indicator
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 10,591 | 9,317 | 7,972 |
| Poor or Fair Health | 17.4% | 16.1% | 14.2% |
| Poor Physical Health Days | 3.8 | 3.5 | 3.3 |
| Poor Mental Health Days | 5.4 | 5.2 | 4.8 |
| Adult Smoking | 18.7% | 18.0% | 15.0% |
| Adult Obesity | 41.1% | 36.7% | 34.0% |
| Air Pollution - Particulate Matter | 10.3 | 8.8 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 12.0% | 10.8% | 9.6% |
| Life Expectancy | 74.7 | 75.6 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Merrillville.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 1 violation for Schererville Water Department.
EPA drinking water records on this page list 4 violations for Munster Water Company, including 2 marked active.
The EPA drinking water records available here list no violations for St. John Municipal Water Utility.
Check your water bill to identify the utility serving your address. Ask that utility about current drinking water advisories.
Nearby EPA monitoring stations provide annual air quality measurements for Merrillville.
The monitoring station at ArcelorMittal-Burns Harbor Site 1, Portage, Indiana recorded an annual average of 6.1 Parts per billion for sulfur dioxide in 2025.
The monitoring station at East Chicago- Franklin School/ Washington School (Ben. Franklin) recorded an annual average of 17.4 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The monitoring station at East Chicago- Franklin School/ Washington School (Ben. Franklin) recorded an annual average of 8.5 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
Download 2025 EPA annual monitor dataCurrent air quality on AirNow
The radon data for Merrillville covers Lake County. EPA places this area in Zone 2, with a predicted average indoor radon screening level of 2 to 4 picocuries per liter.
No Superfund or brownfield sites were returned for this city report.
The county data for Merrillville reports a life expectancy of 74.7 years in Lake County, Indiana.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Merrillville reports 10,591 years of life lost to deaths before age 75 per 100,000 residents in Lake County, Indiana. This measure adds up the years lost to early deaths and adjusts for differences in population age.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Merrillville lists fine-particle pollution (PM2.5) at 10.3 micrograms per cubic meter in Lake County, Indiana.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.