Public water system · IN5245015
ActiveIndiana American Water - Northwest
At a glance
Indiana American Water - Northwest (PWSID IN5245015) is an active community water system in Lake County, Indiana. It reports serving 210,510 people through 84,204 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in September 2013.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
210,510
Service connections
84,204
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Indiana American Water - Northwest compare with other water systems in Lake County?
By EPA's size categories, Indiana American Water - Northwest is a very large system (more than 100,000 people). Lake County has 110 active public water systems, and Indiana American Water - Northwest is the largest of them by population served. Its population served is about 43 times the county average of 4,845 people per system, and accounts for 39% of the 532,973 people reported by systems filed under the county. Across Indiana, the 3,969 active systems average 1,456 people each. Nationally, the average active community water system reports serving 6,703 people, so Indiana American Water - Northwest is about 31 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Indiana has 770 active community water systems, 19% of the state's 3,969 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 30 Indiana systems (0.8%) list surface water as their primary source.
Who owns and regulates Indiana American Water - Northwest?
EPA lists Indiana American Water - Northwest as privately owned. The IN state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 86 of the 110 active systems in Lake County (78%) are also privately owned.
Does Indiana American Water - Northwest have drinking water violations?
EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in September 2013. The violations listed here began between June 1980 and September 2013. By type: 9 monitoring and reporting and 2 required treatment not met. The contaminants or rules involved are Surface Water Treatment Rule, Lead and Copper Rule, Cadmium and Arsenic. EPA lists 9 as archived and 2 as resolved. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2013-09-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 2008-07-01 | Required treatment not metWQP Entry Point/Tap Treatment Technique Non-Compliance · code 59 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 1980-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Archived |
| 1980-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 1980-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Archived |
| 1980-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 1980-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Archived |
| 1980-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
| 1980-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
| 1980-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Archived |
| 1980-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 11 violations in EPA's records, newest first. Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Indiana American Water - Northwest: frequently asked questions
Who runs Indiana American Water - Northwest?
Indiana American Water - Northwest (PWSID IN5245015) is a community water system privately owned. It is regulated by the IN state drinking water program.
How many people does Indiana American Water - Northwest serve?
Indiana American Water - Northwest reports serving 210,510 people through 84,204 service connections in Lake County, Indiana.
Where does Indiana American Water - Northwest get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Indiana American Water - Northwest have any drinking water violations?
EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in September 2013. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Indiana American Water - Northwest's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in September 2013. For current results, consult the system's annual water quality report, EPA ECHO, or the IN state drinking water program.
Where can I find Indiana American Water - Northwest's water quality report?
As a community water system, Indiana American Water - Northwest must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Lake County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hammond Water Works Department | Lake | 78,384 | Community | Surface water |
| Schererville Water Department | Lake | 30,000 | Community | Purchased surface water |
| Crown Point Water Works | Lake | 30,000 | Community | Purchased surface water |
| East Chicago Water Works | Lake | 26,370 | Community | Surface water |
| St. John Municipal Water Utility | Lake | 25,700 | Community | Groundwater |
| Highland Water Works | Lake | 23,984 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Indiana American Water - Northwest, PWSID IN5245015, Indiana”, https://aquacensus.com/water-systems/indiana/indiana-american-water-northwest-in5245015 (data as of October 1, 2026).