Public water system · IL1670090
ActiveRound Prairie Water Coop
At a glance
Round Prairie Water Coop (PWSID IL1670090) is an active community water system in Sangamon County, Illinois. It reports serving 813 people through 325 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list 3 violations for this system; none is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
813
Service connections
325
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Round Prairie Water Coop compare with other water systems in Sangamon County?
By EPA's size categories, Round Prairie Water Coop is a small system (501 to 3,300 people). Sangamon County has 43 active public water systems. Its population served is well below the county average of 4,245 people per system, and accounts for 0.4% of the 182,536 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active community water system reports serving 6,703 people, so Round Prairie Water Coop is well below 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. Illinois has 1,773 active community water systems, 46% of the state's 3,872 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 619 Illinois systems (16%) list purchased surface water as their primary source.
Who owns and regulates Round Prairie Water Coop?
EPA lists Round Prairie Water Coop 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. 23 of the 43 active systems in Sangamon County (53%) are also privately owned.
Does Round Prairie Water Coop have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in October 2025. The violations listed here began between April 2025 and October 2025. By type: 3 monitoring and reporting. The contaminant or rule involved most often is Haloacetic acids (HAA5) (2 of them). EPA lists 2 as resolved and 1 as archived. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Archived |
| 2025-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2025-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
All 3 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.
Round Prairie Water Coop: frequently asked questions
Who runs Round Prairie Water Coop?
Round Prairie Water Coop (PWSID IL1670090) is a community water system privately owned. It is regulated by the IL state drinking water program.
How many people does Round Prairie Water Coop serve?
Round Prairie Water Coop reports serving 813 people through 325 service connections in Sangamon County, Illinois.
Where does Round Prairie Water Coop get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Round Prairie Water Coop have any drinking water violations?
EPA's records list 3 violations for this system; 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 Round Prairie Water Coop'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 3 violations for this system; none is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Round Prairie Water Coop's water quality report?
As a community water system, Round Prairie Water Coop 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 Sangamon County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Springfield | Sangamon | 117,444 | Community | Surface water |
| Chatham | Sangamon | 16,423 | Community | Purchased groundwater |
| Curran-Gardner Township PWD | Sangamon | 6,651 | Community | Groundwater |
| Williamsville | Sangamon | 6,198 | Community | Purchased surface water |
| Auburn | Sangamon | 4,574 | Community | Purchased surface water |
| Riverton | Sangamon | 4,279 | 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, “Round Prairie Water Coop, PWSID IL1670090, Illinois”, https://aquacensus.com/water-systems/illinois/round-prairie-water-coop-il1670090 (data as of October 1, 2026).