Water Quality in 46410 — Merrillville, IN

Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026

Your Water System

ZIP code 46410 in Merrillville, Indiana is served by CUII - INDIANA WATER SERVICE (EPA ID: IN5245057). This system provides water to approximately 4,200 people from surface water sources.

There are 3 community water systems serving this area.

Lead & Copper in Your Water

No Lead & Copper Rule sampling data available for systems serving this ZIP code.

Violation Summary

Recent Violations

Contaminants Detected

The following contaminants have been flagged in EPA records for water systems serving this ZIP code:

Water Systems Serving This Area

What You Can Do

1. Request your water system’s Consumer Confidence Report (CCR) — Your utility is required to publish this annually
2. Consider a home water test — Independent testing can reveal issues in your specific plumbing
3. Install a certified water filter — NSF-certified filters can address specific contaminants
4. Contact your water provider — Ask about current treatment and any ongoing remediation

Other Water Quality Reports in Indiana

• 46001 (Alexandria) — 9 violations
• 46011 (Anderson) — 25 violations
• 46030 (Arcadia)
• 46031 (Atlanta) — 7 violations
• 46032 (Carmel) — 15 violations
• 46034 (Cicero) — 13 violations
• 46035 (Colfax)
• 46036 (Elwood) — 2 violations
• 46037 (Fishers) — 9 violations
• 46040 (Fortville) — 2 violations
• 46041 (Frankfort) — 2 violations
• 46044 (Frankton) — 3 violations
• 46048 (Ingalls)
• 46050 (Kirklin) — 13 violations
• 46051 (Lapel) — 13 violations
• 46060 (Noblesville) — 18 violations
• 46142 (Greenwood)
• 46201 (Indianapolis) — 11 violations
• 46307 (Crown Point) — 13 violations
• 46320 (Hammond) — 17 violations

Nearby Water Quality Reports

• 46307 (Crown Point) — 5 mi — 13 violations
• 46320 (Hammond) — 11 mi — 17 violations
• 60411 (Chicago Heights, IL) — 12 mi — 9 violations
• 46383 (Valparaiso) — 15 mi — 64 violations
• 60453 (Oak Lawn, IL) — 26 mi — 7 violations

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for CUII - INDIANA WATER SERVICE (IN5245057) on EPA.gov.

Frequently Asked Questions

Is the tap water in 46410 safe to drink?

Merrillville’s water system has recorded 1 health-based violation in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.

Where does 46410’s water come from?

The primary water source for this area is surface water. CUII - INDIANA WATER SERVICE serves approximately 4,200 people.

How can I get my water tested?

Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.

Does 46410 have lead in the water?

No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 46410. If you are concerned about lead, contact your water utility or have your tap water independently tested.

What is the radon risk in 46410?

Radon zone data is not available for ZIP code 46410. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.