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Public water system record

Pine Ridge Water System

Serves Pine Ridge, Oglala Lakota County, SD · 7,482 people served

Federal records show 2 health-based violations and 1 monitoring/reporting issue for Pine Ridge Water System in the last ten years. The most serious issue in this window was a resolved Combined Uranium violation.

  • 084690475
  • PINE RIDGE
  • SD
  • 7,482 served

System profile

Source water Groundwater
ZIP 57770
EPA system ID 084690475

Verify this system on EPA ECHO →

Health-based violations, last 10 years
2
Resolved
2
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
1

Key facts

  • Pine Ridge Water System draws water from 6 wells.
  • Highest measured level in the last 10 years: Combined Uranium, 31 µg/L, federal limit 30 µg/L (at or just above the limit), 2019.
  • Record on file since 1976, with 21 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 1,001 unknown out of 1,001 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Combined Uranium
Contaminant limit exceeded
Measured 31 µg/L, federal limit 30 µg/L (at or just above the limit)
 340 Oct 1, 2019 Resolved No
Groundwater Rule
Treatment technique failure
 140 Jul 24, 2018 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Lead and Copper Rule
Monitoring and reporting
 Dec 30, 2023 Resolved

Full record since 1976

EPA's records for Pine Ridge Water System go back to 1976. Before October 19, 2016 they list 21 health-based violations (21 archived by EPA without a recorded fix) and 89 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1970s 0 2
1980s 0 9
1990s 21 78
October 19, 2016 to 2019 2 0
2020s 0 1

Most recent health-based violation before October 19, 2016: Total Coliform, began June 1999, Archived.

Show all 21 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Jun 1, 1999 Archived
Total Coliform
Contaminant limit exceeded
 Oct 1, 1998 Archived
Total Coliform
Contaminant limit exceeded
 Jul 1, 1998 Archived
Total Coliform
Contaminant limit exceeded
 Apr 1, 1998 Archived
Total Coliform (acute)
Contaminant limit exceeded
 Sep 1, 1997 Archived
Total Coliform
Contaminant limit exceeded
 Sep 1, 1997 Archived
Total Coliform
Contaminant limit exceeded
 Aug 1, 1997 Archived
Total Coliform
Contaminant limit exceeded
 Jul 1, 1997 Archived
Total Coliform
Contaminant limit exceeded
 Jun 1, 1997 Archived
Total Coliform
Contaminant limit exceeded
 Sep 1, 1995 Archived
Total Coliform
Contaminant limit exceeded
 Sep 1, 1995 Archived
Total Coliform (acute)
Contaminant limit exceeded
 Jan 1, 1995 Archived
Total Coliform
Contaminant limit exceeded
 Jan 1, 1995 Archived
Total Coliform
Contaminant limit exceeded
 Oct 1, 1994 Archived
Total Coliform
Contaminant limit exceeded
 Sep 1, 1994 Archived
Total Coliform
Contaminant limit exceeded
 Aug 1, 1994 Archived
Total Coliform (acute)
Contaminant limit exceeded
 Sep 1, 1991 Archived
Total Coliform (acute)
Contaminant limit exceeded
 Sep 1, 1991 Archived
Total Coliform
Contaminant limit exceeded
 Sep 1, 1991 Archived
Total Coliform
Contaminant limit exceeded
 Sep 1, 1991 Archived
Total Coliform
Contaminant limit exceeded
 Jul 1, 1991 Archived

What the violations mean

Combined Uranium

1 incident

Test results for Combined Uranium were above the federal limit (a maximum contaminant level violation).

The utility had to notify customers about this violation.

Groundwater Rule

1 incident

The system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Pine Ridge Water System draws water from 6 wells. 1 other public water system has an emergency connection to Pine Ridge Water System.

Annual water quality report

Pine Ridge Water System must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by EPA Region 8.

Certified drinking water labs by state EPA guidance for private wells