Public water system · SD4600549
ActiveDeer Mountain Sanitary District
At a glance
Deer Mountain Sanitary District (PWSID SD4600549) is an active community water system in Lawrence County, South Dakota. It reports serving 125 people through 100 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2018.
This page covers its drinking water system only; sewer and wastewater service are not part of EPA's drinking water records.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
125
Service connections
100
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Deer Mountain Sanitary District compare with other water systems in Lawrence County?
By EPA's size categories, Deer Mountain Sanitary District is a very small system (500 people or fewer). Lawrence County has 73 active public water systems. Its population served is about 66% below the county average of 373 people per system, and accounts for 0.5% of the 27,194 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 Deer Mountain Sanitary District 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 24 South Dakota systems (3.4%) list surface water as their primary source.
Who owns and regulates Deer Mountain Sanitary District?
EPA lists Deer Mountain Sanitary District 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. 10 of the 73 active systems in Lawrence County (14%) are also owned by a local government.
Does Deer Mountain Sanitary District have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2018. The violations listed here began between January 2013 and January 2018. By type: 7 monitoring and reporting, 4 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Public Notice (4 of them). 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 |
|---|---|---|---|---|
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2015-06-01 | Required treatment not metFailure To Address Deficiency · code 45 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2013-04-09 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2013-03-03 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2013-03-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2013-02-05 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2013-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2013-02-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2013-01-06 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2013-01-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2013-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | 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.
Deer Mountain Sanitary District: frequently asked questions
Who runs Deer Mountain Sanitary District?
Deer Mountain Sanitary District (PWSID SD4600549) is a community water system owned by a local government. It is regulated by the SD state drinking water program.
How many people does Deer Mountain Sanitary District serve?
Deer Mountain Sanitary District reports serving 125 people through 100 service connections in Lawrence County, South Dakota.
Where does Deer Mountain Sanitary District get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Deer Mountain Sanitary District 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 January 2018. 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 Deer Mountain Sanitary District'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 January 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.
Where can I find Deer Mountain Sanitary District's water quality report?
As a community water system, Deer Mountain Sanitary District 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 Lawrence County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Spearfish | Lawrence | 13,803 | Community | Groundwater |
| Lead | Lawrence | 2,982 | Community | Purchased surface water |
| Deadwood | Lawrence | 1,156 | Community | Purchased surface water |
| Whitewood | Lawrence | 879 | Community | Groundwater |
| Guadalajara Mexican Restaurant | Lawrence | 630 | Transient non-community | Groundwater |
| Spearfish Canyon Resort LLC | Lawrence | 492 | Transient non-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, “Deer Mountain Sanitary District, PWSID SD4600549, South Dakota”, https://aquacensus.com/water-systems/south-dakota/deer-mountain-sanitary-district-sd4600549 (data as of October 1, 2026).