Public water system · SD4600020

Active

Aberdeen

At a glance

Aberdeen (PWSID SD4600020) is an active community water system in Brown County, South Dakota. It reports serving 27,989 people through 8,968 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, 11 are health-based, and the most recent began in February 2026.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

27,989

Service connections

8,968

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDSD4600020

System typeCommunity water system

Activity statusActive

Population served27,989

Service connections8,968

Primary water sourceSurface water

Owner typeLocal government

Primacy agencySD state drinking water program

City servedAberdeen

StateSouth Dakota

ZIP57401

CountyBrown County

How does Aberdeen compare with other water systems in Brown County?

By EPA's size categories, Aberdeen is a large system (10,001 to 100,000 people). Brown County has 21 active public water systems, and Aberdeen is the largest of them by population served. Its population served is about 15 times the county average of 1,813 people per system, and accounts for 74% of the 38,073 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 Aberdeen is about 4.2 times 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 Aberdeen?

EPA lists Aberdeen 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. 8 of the 21 active systems in Brown County (38%) are also owned by a local government.

Does Aberdeen have drinking water violations?

Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in February 2026. The violations listed here began between May 2006 and February 2026. By type: 8 required treatment not met, 3 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (8 of them). EPA lists 11 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
2026-02-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Archived
2025-05-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2024-12-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2024-12-01	Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2024-11-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2023-07-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2022-04-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2014-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Carbon, totalcode 2920	No	Resolved
2012-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2012-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2011-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2006-05-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	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.

Aberdeen: frequently asked questions

Who runs Aberdeen?

Aberdeen (PWSID SD4600020) is a community water system owned by a local government. It is regulated by the SD state drinking water program.

How many people does Aberdeen serve?

Aberdeen reports serving 27,989 people through 8,968 service connections in Brown County, South Dakota.

Where does Aberdeen 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 Aberdeen have any drinking water violations?

Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in February 2026. 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 Aberdeen'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, 11 are health-based, and the most recent began in February 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.

Where can I find Aberdeen's water quality report?

As a community water system, Aberdeen 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 Brown County

Water system	County	Population served	Type	Source
Brown-Day-Marshall Rws	Brown + 2 more	5,673	Community	Groundwater
Groton	Brown	1,380	Community	Purchased surface water
Warner	Brown	485	Community	Purchased surface water
Lakeside Estates	Brown	460	Community	Purchased surface water
Country Village Park	Brown	340	Community	Purchased surface water
Prairiewood Property Owners	Brown	300	Community	Purchased surface water

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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, “Aberdeen, PWSID SD4600020, South Dakota”, https://aquacensus.com/water-systems/south-dakota/aberdeen-sd4600020 (data as of October 1, 2026).