Public water system · IL3034314
ActiveEquistar Chemicals Lp
At a glance
Equistar Chemicals Lp (PWSID IL3034314) is an active non-transient non-community water system in Grundy County, Illinois. It reports serving 600 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
600
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Equistar Chemicals Lp compare with other water systems in Grundy County?
By EPA's size categories, Equistar Chemicals Lp is a small system (501 to 3,300 people). Grundy County has 51 active public water systems. Its population served is about 40% below the county average of 1,002 people per system, and accounts for 1.2% of the 51,074 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Equistar Chemicals Lp is about 40% above that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Illinois has 396 active non-transient non-community water systems, 10% of the state's 3,872 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,808 Illinois systems (73%) list groundwater as their primary source.
Who owns and regulates Equistar Chemicals Lp?
EPA lists Equistar Chemicals Lp as privately owned. The IL state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 29 of the 51 active systems in Grundy County (57%) are also privately owned.
Does Equistar Chemicals Lp have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. The violations listed here began between July 2025 and October 2025. By type: 12 monitoring and reporting. The contaminant or rule involved most often is Thallium (2 of them). EPA lists 11 as archived and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Thalliumcode 1085 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Antimonycode 1074 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cyanidecode 1024 | No | Archived |
| 2025-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Berylliumcode 1075 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Archived |
| 2025-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Archived |
| 2025-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Thalliumcode 1085 | No | Archived |
The 12 most recent 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.
Equistar Chemicals Lp: frequently asked questions
Who runs Equistar Chemicals Lp?
Equistar Chemicals Lp (PWSID IL3034314) is a non-transient non-community water system privately owned. It is regulated by the IL state drinking water program.
How many people does Equistar Chemicals Lp serve?
Equistar Chemicals Lp reports serving 600 people through 1 service connection in Grundy County, Illinois.
Where does Equistar Chemicals Lp get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Equistar Chemicals Lp have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. 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 Equistar Chemicals Lp'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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. For current results, consult EPA ECHO, or the IL state drinking water program.
Where can I find Equistar Chemicals Lp's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Equistar Chemicals Lp is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Grundy County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Morris | Grundy | 14,775 | Community | Groundwater |
| Minooka | Grundy | 12,800 | Community | Groundwater |
| Coal City | Grundy | 5,749 | Community | Groundwater |
| Diamond | Grundy | 2,508 | Community | Groundwater |
| Coal City Area Club | Grundy | 2,500 | Transient non-community | Groundwater |
| Gardner | Grundy | 1,361 | Community | Groundwater |
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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, “Equistar Chemicals Lp, PWSID IL3034314, Illinois”, https://aquacensus.com/water-systems/illinois/equistar-chemicals-lp-il3034314 (data as of October 1, 2026).