Public water system · IL3163188
ActiveUs Silica Ottawa South Pit
At a glance
Us Silica Ottawa South Pit (PWSID IL3163188) is an active non-transient non-community water system in LaSalle County, Illinois. It reports serving 35 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 April 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
35
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Us Silica Ottawa South Pit compare with other water systems in LaSalle County?
By EPA's size categories, Us Silica Ottawa South Pit is a very small system (500 people or fewer). LaSalle County has 129 active public water systems. Its population served is well below the county average of 816 people per system, and accounts for less than 0.1% of the 105,319 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 Us Silica Ottawa South Pit is well below 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 Us Silica Ottawa South Pit?
EPA lists Us Silica Ottawa South Pit 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. 99 of the 129 active systems in LaSalle County (77%) are also privately owned.
Does Us Silica Ottawa South Pit have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2022. The violations listed here began between April 2022 and April 2022. By type: 12 monitoring and reporting. The contaminants or rules involved are Xylenes, Total, 1,1,1-Trichloroethane, 1,1-Dichloroethylene and 1,2,4-Trichlorobenzene. EPA lists 12 as resolved. 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 |
|---|---|---|---|---|
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Xylenes, Totalcode 2955 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,1-Trichloroethanecode 2981 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2,4-Trichlorobenzenecode 2378 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | o-Dichlorobenzenecode 2968 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 2,4,5-TP (Silvex)code 2110 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlorcode 2065 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Polychlorinated biphenyls (PCBs), totalcode 2383 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylene dibromide (EDB)code 2946 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dibromo-3-chloropropane (DBCP)code 2931 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Resolved |
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.
Us Silica Ottawa South Pit: frequently asked questions
Who runs Us Silica Ottawa South Pit?
Us Silica Ottawa South Pit (PWSID IL3163188) is a non-transient non-community water system privately owned. It is regulated by the IL state drinking water program.
How many people does Us Silica Ottawa South Pit serve?
Us Silica Ottawa South Pit reports serving 35 people through 1 service connection in LaSalle County, Illinois.
Where does Us Silica Ottawa South Pit 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 Us Silica Ottawa South Pit 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 April 2022. 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 Us Silica Ottawa South Pit'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 April 2022. For current results, consult EPA ECHO, or the IL state drinking water program.
Where can I find Us Silica Ottawa South Pit's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Us Silica Ottawa South Pit 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 LaSalle County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Il American-Streator | LaSalle | 19,000 | Community | Surface water |
| Ottawa | LaSalle | 18,097 | Community | Groundwater |
| Peru | LaSalle | 10,300 | Community | Groundwater |
| La Salle | LaSalle | 9,700 | Community | Groundwater |
| Mendota | LaSalle | 7,100 | Community | Groundwater |
| Marseilles | LaSalle | 5,061 | 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, “Us Silica Ottawa South Pit, PWSID IL3163188, Illinois”, https://aquacensus.com/water-systems/illinois/us-silica-ottawa-south-pit-il3163188 (data as of October 1, 2026).