Public water system · SD4600102
ActiveDallas
At a glance
Dallas (PWSID SD4600102) is an active community water system in Gregory County, South Dakota. It reports serving 89 people through 81 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; none is health-based, and the most recent began in July 2003.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
89
Service connections
81
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Dallas compare with other water systems in Gregory County?
By EPA's size categories, Dallas is a very small system (500 people or fewer). Gregory County has 4 active public water systems, and Dallas is the 4th-largest of them by population served. Its population served is well below the county average of 540 people per system, and accounts for 4.1% of the 2,160 people reported by systems filed under the county. 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 Dallas 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. South Dakota has 510 active community water systems, 73% of the state's 699 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 100 South Dakota systems (14%) list purchased groundwater as their primary source.
Who owns and regulates Dallas?
EPA lists Dallas as owned by a local government. 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. 4 of the 4 active systems in Gregory County (100%) are also owned by a local government.
Does Dallas have drinking water violations?
EPA's records list 7 violations for this system; none is health-based, and the most recent began in July 2003. The violations listed here began between July 1976 and July 2003. By type: 6 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2003-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1999-07-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1995-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1994-01-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1991-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1976-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Archived |
| 1976-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 7 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.
Dallas: frequently asked questions
Who runs Dallas?
Dallas (PWSID SD4600102) is a community water system owned by a local government. It is regulated by the SD state drinking water program.
How many people does Dallas serve?
Dallas reports serving 89 people through 81 service connections in Gregory County, South Dakota.
Where does Dallas get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Dallas have any drinking water violations?
EPA's records list 7 violations for this system; none is health-based, and the most recent began in July 2003. 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 Dallas' 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 7 violations for this system; none is health-based, and the most recent began in July 2003. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.
Where can I find Dallas' water quality report?
As a community water system, Dallas 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 Gregory County
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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, “Dallas, PWSID SD4600102, South Dakota”, https://aquacensus.com/water-systems/south-dakota/dallas-sd4600102 (data as of October 1, 2026).