Public water system · SD4600030
ActiveAmherst Water Company
At a glance
Amherst Water Company (PWSID SD4600030) is an active community water system in Marshall County, South Dakota. It reports serving 40 people through 16 service connections. Its primary water source is purchased groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
40
Service connections
16
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Amherst Water Company compare with other water systems in Marshall County?
By EPA's size categories, Amherst Water Company is a very small system (500 people or fewer). Marshall County has 7 active public water systems. Its population served is well below the county average of 305 people per system, and accounts for 1.9% of the 2,134 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 Amherst Water Company 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 Amherst Water Company?
EPA lists Amherst Water Company 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. 2 of the 7 active systems in Marshall County (29%) are also privately owned.
Does Amherst Water Company have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2014. The violations listed here began between October 1993 and October 2014. By type: 7 public notice, recordkeeping or other, 4 monitoring and reporting and 1 disinfectant level above the legal limit. The contaminant or rule involved most often is Consumer Confidence Rule (4 of them). EPA lists 7 as resolved and 5 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 |
|---|---|---|---|---|
| 2014-10-01 | Disinfectant level above the legal limitNon-Acute MRDL · code 11 | Chloraminecode 1006 | Yes | Resolved |
| 2004-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2004-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2001-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2000-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1994-11-12 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1994-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1994-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1994-01-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-12-11 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1993-11-08 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1993-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | 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.
Amherst Water Company: frequently asked questions
Who runs Amherst Water Company?
Amherst Water Company (PWSID SD4600030) is a community water system privately owned. It is regulated by the SD state drinking water program.
How many people does Amherst Water Company serve?
Amherst Water Company reports serving 40 people through 16 service connections in Marshall County, South Dakota.
Where does Amherst Water Company 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 Amherst Water Company have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2014. 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 Amherst Water Company'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, one is health-based, and the most recent began in October 2014. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.
Where can I find Amherst Water Company's water quality report?
As a community water system, Amherst Water Company 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 Marshall County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Britton | Marshall | 1,215 | Community | Purchased groundwater |
| Veblen | Marshall | 317 | Community | Purchased groundwater |
| Langford | Marshall | 283 | Community | Purchased groundwater |
| Sunset Colony | Marshall | 140 | Community | Groundwater |
| Eden | Marshall | 94 | Community | Purchased surface water |
| Lake City | Marshall | 45 | Community | Purchased 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, “Amherst Water Company, PWSID SD4600030, South Dakota”, https://aquacensus.com/water-systems/south-dakota/amherst-water-company-sd4600030 (data as of October 1, 2026).