Public water system · SD4600429
ActiveBig Sioux Community Water System
At a glance
Big Sioux Community Water System (PWSID SD4600429) is an active community water system serving Moody, Brookings and Lake counties, South Dakota. It reports serving 5,800 people through 2,330 service connections. Its primary water source is groundwater, 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 July 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,800
Service connections
2,330
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Big Sioux Community Water System compare with other water systems in South Dakota?
By EPA's size categories, Big Sioux Community Water System is a medium system (3,301 to 10,000 people). Across South Dakota, the 699 active systems average 1,387 people each. Nationally, the average active community water system reports serving 6,703 people, so Big Sioux Community Water System is about 13% 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. South Dakota has 510 active community water systems, 73% of the state's 699 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 431 South Dakota systems (62%) list groundwater as their primary source.
Who owns and regulates Big Sioux Community Water System?
EPA lists Big Sioux Community Water System as privately owned. The SD state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.
Does Big Sioux Community Water System have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in July 2021. The violations listed here began between July 1976 and July 2021. By type: 3 monitoring and reporting. The contaminants or rules involved are Nitrate, Gross alpha (excluding radon and uranium) and Combined Radium (-226 and -228). EPA lists 2 as archived and 1 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 |
|---|---|---|---|---|
| 2021-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1976-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1976-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Archived |
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.
Big Sioux Community Water System: frequently asked questions
Who runs Big Sioux Community Water System?
Big Sioux Community Water System (PWSID SD4600429) is a community water system privately owned. It is regulated by the SD state drinking water program.
How many people does Big Sioux Community Water System serve?
Big Sioux Community Water System reports serving 5,800 people through 2,330 service connections in Moody, Brookings and Lake counties, South Dakota.
Where does Big Sioux Community Water System 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 Big Sioux Community Water System have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in July 2021. 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 Big Sioux Community Water System'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 July 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.
Where can I find Big Sioux Community Water System's water quality report?
As a community water system, Big Sioux Community Water System 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 Moody County(the first county EPA lists for this system)
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Flandreau | Moody | 2,372 | Community | Purchased groundwater |
| Colman | Moody | 634 | Community | Purchased groundwater |
| Egan | Moody | 241 | Community | Purchased groundwater |
| Trent | Moody | 206 | Community | Purchased groundwater |
| Pleasant Valley Colony | Moody | 107 | Community | Groundwater |
| Ward | Moody | 41 | Community | Groundwater |
Related pages
- All water systems in Moody County· 7 active
- All water systems in Brookings County· 12 active
- All water systems in Lake County· 5 active
- All South Dakota public water systems· 699 active
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
- What a drinking water violation notice means
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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, “Big Sioux Community Water System, PWSID SD4600429, South Dakota”, https://aquacensus.com/water-systems/south-dakota/big-sioux-community-water-system-sd4600429 (data as of October 1, 2026).