Public Water Partners

KEYSTONE, SD · Pennington County

KEYSTONE Water System

Consumer Confidence Report status

KEYSTONE must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for KEYSTONE.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace South Dakota’s official records. Always confirm current status with South Dakota before making decisions based on this information.

System facts

System ID (PWSID)
SD4601082
System type
Community Water System
Population served
349
Service connections
249
Ownership
local government
Water source
groundwater (wells)

KEYSTONE is one of 583 community water systems in South Dakota in the 500 or fewer people size category, serving 349 people from groundwater.

As of August 1, 2026, its federal record holds 2 entries between 2015 and 2019, all of which EPA lists as closed. Nothing has been added since 2019.

Of the 2, 1 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Radionuclides and Revised Rad Rule and the Total Coliform Rules.

Violation history

  • Monitoring, Regular

    —

    Combined Radium (-226 and -228)

    January 1, 2019 – March 31, 2019

    Resolved

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    October 1, 2015 – October 31, 2015

    Resolved

Resolved addressed and confirmed by the state

Enforcement actions

No enforcement actions on record for this system.

Common questions

Is KEYSTONE required to publish a Consumer Confidence Report?

Yes. KEYSTONE is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is KEYSTONE’s next Consumer Confidence Report due?

KEYSTONE’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does KEYSTONE have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for KEYSTONE.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

KEYSTONE

6056664827

KEYSTONE, SD 57751