Public water system · 084690475

Active

Pine Ridge Water System

At a glance

Pine Ridge Water System (PWSID 084690475) is an active community water system in South Dakota. It reports serving 7,482 people through 1,151 service connections. Its primary water source is groundwater, and EPA lists it as Native American-owned. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in December 2023.

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

Population served

7,482

Service connections

1,151

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSID084690475

System typeCommunity water system

Activity statusActive

Population served7,482

Service connections1,151

Primary water sourceGroundwater

Owner typeNative American

Primacy agencyEPA Region 08

City served—

StateSouth Dakota

ZIP—

County—

How does Pine Ridge Water System compare with other water systems in South Dakota?

By EPA's size categories, Pine Ridge 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 Pine Ridge Water System is about 12% above 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 Pine Ridge Water System?

EPA lists Pine Ridge Water System as Native American-owned. The EPA Region 08 is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.

Does Pine Ridge Water System have drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in December 2023. The violations listed here began between January 1998 and December 2023. By type: 6 monitoring and reporting, 5 contaminant level above the legal limit and 1 required treatment not met. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 9 as archived and 3 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
2023-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2019-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Uraniumcode 4006	Yes	Resolved
2018-07-24	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Resolved
1999-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1998-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1998-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1998-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1998-01-01	Monitoring and reportingMonitoring, Regular · code 03	Ethylbenzenecode 2992	No	Archived
1998-01-01	Monitoring and reportingMonitoring, Regular · code 03	p-Dichlorobenzenecode 2969	No	Archived
1998-01-01	Monitoring and reportingMonitoring, Regular · code 03	Dichloromethanecode 2964	No	Archived
1998-01-01	Monitoring and reportingMonitoring, Regular · code 03	1,2-Dichloroethanecode 2980	No	Archived
1998-01-01	Monitoring and reportingMonitoring, Regular · code 03	1,1,2-Trichloroethanecode 2985	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.

Pine Ridge Water System: frequently asked questions

Who runs Pine Ridge Water System?

Pine Ridge Water System (PWSID 084690475) is a community water system Native American-owned. It is regulated by the EPA Region 08.

How many people does Pine Ridge Water System serve?

Pine Ridge Water System reports serving 7,482 people through 1,151 service connections in South Dakota.

Where does Pine Ridge 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 Pine Ridge Water System have any drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in December 2023. 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 Pine Ridge 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. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in December 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the EPA Region 08.

Where can I find Pine Ridge Water System's water quality report?

As a community water system, Pine Ridge 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 South Dakota

Water system	County	Population served	Type	Source
Sioux Falls	Minnehaha	216,462	Community	Surface water
Rapid City	Pennington	72,009	Community	Surface water
Aberdeen	Brown	27,989	Community	Surface water
Brookings Municipal Utilities	Brookings	23,377	Community	Groundwater
Watertown Municipal Utilities	Codington	23,230	Community	Groundwater
Web Water Development Association	Walworth + 9 more	20,750	Community	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, “Pine Ridge Water System, PWSID 084690475, South Dakota”, https://aquacensus.com/water-systems/south-dakota/pine-ridge-water-system-084690475 (data as of October 1, 2026).